From mboxrd@z Thu Jan 1 00:00:00 1970
Return-Path: <users-bounces@dpdk.org>
Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124])
by inbox.dpdk.org (Postfix) with ESMTP id 1B8FB459DA
for <public@inbox.dpdk.org>; Thu, 19 Sep 2024 18:45:55 +0200 (CEST)
Received: from mails.dpdk.org (localhost [127.0.0.1])
by mails.dpdk.org (Postfix) with ESMTP id B8C84406FF;
Thu, 19 Sep 2024 18:45:54 +0200 (CEST)
Received: from mail-lj1-f182.google.com (mail-lj1-f182.google.com
[209.85.208.182])
by mails.dpdk.org (Postfix) with ESMTP id 8ABC64026B
for <users@dpdk.org>; Thu, 19 Sep 2024 18:45:52 +0200 (CEST)
Received: by mail-lj1-f182.google.com with SMTP id
38308e7fff4ca-2f75de9a503so10052121fa.0
for <users@dpdk.org>; Thu, 19 Sep 2024 09:45:52 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=broadcom.com; s=google; t=1726764352; x=1727369152; darn=dpdk.org;
h=cc:to:subject:message-id:date:from:in-reply-to:references
:mime-version:from:to:cc:subject:date:message-id:reply-to;
bh=MkULQYjRANrCihy4kJHoNInayxSAACqSepljrJtQAhY=;
b=EmWaRkrJb44SkHDDWQ3H1g6+5rbIrWAM82VTWA1eXdXSPP3ZwbtdqqMTkeMZH8nTAA
d/FphEG1vyhdbckifB669IupliNCF2DAx3wNfWr+Kyc3sWmZGHVw0DVw//8upAG4Apyo
W7jY/Pbz/TeVoP3UGpax4mYRz6qwEfPdyHEx4=
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20230601; t=1726764352; x=1727369152;
h=cc:to:subject:message-id:date:from:in-reply-to:references
:mime-version:x-gm-message-state:from:to:cc:subject:date:message-id
:reply-to;
bh=MkULQYjRANrCihy4kJHoNInayxSAACqSepljrJtQAhY=;
b=RF3Yek57p6yH/HfULN4mR3eJ7vCm7x+d2PUEMIdGyIn8+FHZpc4vCzaWM/rHc+ai8r
BqGp/zlngHlwBKqWqREZ/CCdtajuijtEv4SsrWAnuWX1aHslXu+CsJtGh0KdQHLWDVNH
wqTZTT0K31I1zgjd9lZN5Ktu0s1WqG1X6N6fb8sp0jKD3/dTHwjtjek8CUROcbaTpbi5
MfYW9ptgAhsuPOz9s/3ZYSYEn2ohswu9M1gxbIiikojzsxYqcJ7HSJpan6iq2kcVXbFL
O8MZRUEItMVqbvWnzVOEiGPsLiZhj7eeB5eYZv8GpV6CUTBR/PjrtXdtdN0QftT05zBu
LCjA==
X-Forwarded-Encrypted: i=1;
AJvYcCUnCTobpUj3iy0DJKx5Ah/WKPpYL5LmzI/qWx/+w+RI8bzAjDlNX8X3SXLRY9JrlAXJkv8z8A==@dpdk.org
X-Gm-Message-State: AOJu0YyGoki/T8A6mbYTtQeTYTEpGYK6quPprQ5fScqm9fX2+F3OVkCW
0rsHCoQyPOptrlHpIrCqIt9oJLbTWdoV4IwvYb1ar4Df/ToS2x1+tZOJXWmELSB8S04a8uiHj/Z
5hSnGEk2vBeosf7u57u8DWs6QhasrSMdh9M1H+14cYwHlqTccA9sORWMOkjqs6bG9pVNkJ/xjtN
dKR6fSf+E=
X-Google-Smtp-Source: AGHT+IHTxVAvxq8NrH5f+8vlc5BicOtMd2bB/4RYfaWhMWNWWkRdZzhrbgbnlYtqMvO7XbIbQgHGuoHWytUgCUnzIb0=
X-Received: by 2002:a2e:a543:0:b0:2f1:a509:ce66 with SMTP id
38308e7fff4ca-2f7cb2cfe55mr1687991fa.5.1726764351493; Thu, 19 Sep 2024
09:45:51 -0700 (PDT)
MIME-Version: 1.0
References: <CAAkQrK-quv_w+1KG=H3yDsiN9Xki9DigucZCy7q_RwMLmgCYyg@mail.gmail.com>
<20240903170350.7e663864@hermes.local>
<CAAkQrK-gvVUsdyK+EiuaWZk9U7-CRZaJXHAELbV5qjMzmMv82A@mail.gmail.com>
<20240904154246.1c5bbb58@hermes.local>
<PH0PR21MB4456D6BCB98F6E6F75D0D25DCE9D2@PH0PR21MB4456.namprd21.prod.outlook.com>
<CAAkQrK8uYciOV+-tgEvtGhE1UGTqyQ__zio1nVisXso6VfRp-g@mail.gmail.com>
<20240912160948.3714f01d@hermes.local>
<CAAkQrK_HjT3H-xBtYdskrJ+oykf+djxOM41idg2w+7mW9EGytw@mail.gmail.com>
<PH0PR21MB4456B834D4CCF1D5F4987075CE652@PH0PR21MB4456.namprd21.prod.outlook.com>
<CAAkQrK8FZ3deWyuzzKdmJX3yqmW9Bqbgqh2B1nNs1iDaPzJaNw@mail.gmail.com>
<CAAkQrK-WAQHnZ0L5KO1PZdRqapoQ9voWpNbZuOFihwG3jaYVnw@mail.gmail.com>
<PH0PR21MB445658CC7FE9605D627FBDB3CE612@PH0PR21MB4456.namprd21.prod.outlook.com>
In-Reply-To: <PH0PR21MB445658CC7FE9605D627FBDB3CE612@PH0PR21MB4456.namprd21.prod.outlook.com>
From: Nandini Rangaswamy <nandini.rangaswamy@broadcom.com>
Date: Thu, 19 Sep 2024 09:45:39 -0700
Message-ID: <CAAkQrK9My23YMa+=uZu+8pdPp9ERZErEZDVVGY9sgvK3eBwrxQ@mail.gmail.com>
Subject: Re: Netvsc vs Failsafe Performance
To: Long Li <longli@microsoft.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
"users@dpdk.org" <users@dpdk.org>
Content-Type: multipart/alternative; boundary="000000000000c8ae1b06227ba79a"
X-BeenThere: users@dpdk.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: DPDK usage discussions <users.dpdk.org>
List-Unsubscribe: <https://mails.dpdk.org/options/users>,
<mailto:users-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://mails.dpdk.org/archives/users/>
List-Post: <mailto:users@dpdk.org>
List-Help: <mailto:users-request@dpdk.org?subject=help>
List-Subscribe: <https://mails.dpdk.org/listinfo/users>,
<mailto:users-request@dpdk.org?subject=subscribe>
Errors-To: users-bounces@dpdk.org
--000000000000c8ae1b06227ba79a
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Hi Long Li,
I shall test with UDP traffic and get back to you.
Regards,
Nandini
On Tue, Sep 17, 2024 at 2:57=E2=80=AFPM Long Li <longli@microsoft.com> wrot=
e:
> Thank you!
>
>
>
> Are you seeing problems with UDP traffic on the receive side? If
> everything works fine for you, I=E2=80=99m sending a patch.
>
>
>
> Long
>
>
>
> *From:* Nandini Rangaswamy <nandini.rangaswamy@broadcom.com>
> *Sent:* Monday, September 16, 2024 3:58 PM
> *To:* Long Li <longli@microsoft.com>
> *Cc:* Stephen Hemminger <stephen@networkplumber.org>; users@dpdk.org
> *Subject:* Re: Netvsc vs Failsafe Performance
>
>
>
> Hi Long,
>
> I tested this patch and it works as expected. The UDP IPv6 RSS offload bi=
t
> is set and my dpdk app is able to successfully configure the netvsc port.
>
> Regards,
>
> Nandini
>
>
>
> On Fri, Sep 13, 2024 at 2:29=E2=80=AFPM Nandini Rangaswamy <
> nandini.rangaswamy@broadcom.com> wrote:
>
> Thanks Long Li.
>
> I shall try this patch and get back to you.
>
>
>
> On Fri, Sep 13, 2024 at 2:27=E2=80=AFPM Long Li <longli@microsoft.com> wr=
ote:
>
> It=E2=80=99s a bug in netvsc for not reporting RTE_ETH_RSS_NONFRAG_IPV6_U=
DP. It is
> implied as in the case in IPV4.
>
>
>
> Can you try the following patch?
>
>
>
> diff --git a/drivers/net/netvsc/hn_rndis.c b/drivers/net/netvsc/hn_rndis.=
c
>
> index 1ba75ee804..fe1f04d8d9 100644
>
> --- a/drivers/net/netvsc/hn_rndis.c
>
> +++ b/drivers/net/netvsc/hn_rndis.c
>
> @@ -717,6 +717,7 @@ hn_rndis_query_rsscaps(struct hn_data *hv,
>
> if (caps.ndis_caps & NDIS_RSS_CAP_IPV6)
>
> hv->rss_offloads |=3D RTE_ETH_RSS_IPV6
>
> | RTE_ETH_RSS_NONFRAG_IPV6_TCP;
>
> + | RTE_ETH_RSS_NONFRAG_IPV6_UDP;
>
> if (caps.ndis_caps & NDIS_RSS_CAP_IPV6_EX)
>
> hv->rss_offloads |=3D RTE_ETH_RSS_IPV6_EX
>
> | RTE_ETH_RSS_IPV6_TCP_EX;
>
>
>
>
>
> *From:* Nandini Rangaswamy <nandini.rangaswamy@broadcom.com>
> *Sent:* Friday, September 13, 2024 10:56 AM
> *To:* Stephen Hemminger <stephen@networkplumber.org>
> *Cc:* Long Li <longli@microsoft.com>; users@dpdk.org
> *Subject:* Re: Netvsc vs Failsafe Performance
>
>
>
> Thanks for clarifying the question regarding Txd size Stephen.
>
> I tested out the RSS for TCP UDP.
>
> As suggested , I set the TCP flags alone in RSS conf and configured the
> netvsc port.
>
>
>
> struct rte_eth_conf conf =3D {
>
> .intr_conf =3D {
>
> .lsc =3D !dpdk.lsc_intr_disable && !dpdk_if->lsc_intr_disable &&
>
> !!(dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC),
>
> },
>
> .rxmode =3D {
>
> .mq_mode =3D RTE_ETH_MQ_RX_RSS,
>
> .offloads =3D RTE_ETH_RX_OFFLOAD_VLAN_STRIP | RTE_ETH_RX_OFFLOAD_IPV4_CKS=
UM
> |
>
> RTE_ETH_RX_OFFLOAD_RSS_HASH | RTE_ETH_RX_OFFLOAD_UDP_CKSUM,
>
> },
>
> .rx_adv_conf.rss_conf =3D {
>
> .rss_hf =3D RTE_ETH_RSS_NONFRAG_IPV4_TCP | RTE_ETH_RSS_NONFRAG_IPV6_TCP,
>
> .rss_key =3D conf_rss_key,
>
> .rss_key_len =3D rss_key_len,
>
> },
>
> .txmode =3D {
>
> .offloads =3D RTE_ETH_TX_OFFLOAD_UDP_CKSUM | RTE_ETH_TX_OFFLOAD_IPV4_CKSU=
M,
>
> },
>
> };
>
> *rte_eth_dev_configure*(<netvsc port>, num_rxq,num_txq, &conf);
>
> uint8_t rss_key_temp[64];
>
> struct rte_eth_rss_conf rss_conf =3D {
>
> .rss_key =3D rss_key_temp,
>
> .rss_key_len =3D sizeof(rss_key_temp),
>
> };
>
> ret =3D *rte_eth_dev_rss_hash_conf_get*(<VF port>, &rss_conf);
>
>
>
>
>
> Now the VF port RSS offloads show only TCP flags set and not UDP. I
> assumed that even the UDP flags might be set. Is this expected ?
>
>
>
> Regards,
>
> Nandini
>
>
>
>
>
> On Thu, Sep 12, 2024 at 4:09=E2=80=AFPM Stephen Hemminger <
> stephen@networkplumber.org> wrote:
>
> On Thu, 12 Sep 2024 13:47:37 -0700
> Nandini Rangaswamy <nandini.rangaswamy@broadcom.com> wrote:
>
> > Thanks for your response Long Li.
> > I see with netvsc the maximum number of Tx descriptors is restricted to
> > 4096 whereas the number of Rx descriptors is restricted to 8192.
> > But, for failsafe PMD , we see that both the number of Txd and Rxd is
> > restricted to 8192.
> > How is netvsc PMD giving the same performance as failsafe PMD ?
> >
> > Regards
>
> I think the limits there were somewhat arbitrary chose with netvsc.
> Don't remember a hard reason that would block larger sizes.
>
>
> Having really big rings won't help performance (i.e BufferBloat) and
> could a lot of memory consumption. When all heavy data traffic goes throu=
gh
> the VF and that ring is different. Only DoS attacks should be impacted
> by rx/tx descriptor limits in the netvsc device. The linux driver actuall=
y
> has much smaller buffer.
>
>
> This electronic communication and the information and any files
> transmitted with it, or attached to it, are confidential and are intended
> solely for the use of the individual or entity to whom it is addressed an=
d
> may contain information that is confidential, legally privileged, protect=
ed
> by privacy laws, or otherwise restricted from disclosure to anyone else. =
If
> you are not the intended recipient or the person responsible for deliveri=
ng
> the e-mail to the intended recipient, you are hereby notified that any us=
e,
> copying, distributing, dissemination, forwarding, printing, or copying of
> this e-mail is strictly prohibited. If you received this e-mail in error,
> please return the e-mail to the sender, delete it from your computer, and
> destroy any printed copy of it.
>
>
> This electronic communication and the information and any files
> transmitted with it, or attached to it, are confidential and are intended
> solely for the use of the individual or entity to whom it is addressed an=
d
> may contain information that is confidential, legally privileged, protect=
ed
> by privacy laws, or otherwise restricted from disclosure to anyone else. =
If
> you are not the intended recipient or the person responsible for deliveri=
ng
> the e-mail to the intended recipient, you are hereby notified that any us=
e,
> copying, distributing, dissemination, forwarding, printing, or copying of
> this e-mail is strictly prohibited. If you received this e-mail in error,
> please return the e-mail to the sender, delete it from your computer, and
> destroy any printed copy of it.
>
--=20
This electronic communication and the information and any files transmitted=
=20
with it, or attached to it, are confidential and are intended solely for=20
the use of the individual or entity to whom it is addressed and may contain=
=20
information that is confidential, legally privileged, protected by privacy=
=20
laws, or otherwise restricted from disclosure to anyone else. If you are=20
not the intended recipient or the person responsible for delivering the=20
e-mail to the intended recipient, you are hereby notified that any use,=20
copying, distributing, dissemination, forwarding, printing, or copying of=
=20
this e-mail is strictly prohibited. If you received this e-mail in error,=
=20
please return the e-mail to the sender, delete it from your computer, and=
=20
destroy any printed copy of it.
--000000000000c8ae1b06227ba79a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Hi Long Li,<div>I shall test with UDP traffic and get=C2=
=A0back to you.</div><div>Regards,</div><div>Nandini</div></div><br><div cl=
ass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Sep 17, 2=
024 at 2:57=E2=80=AFPM Long Li <<a href=3D"mailto:longli@microsoft.com">=
longli@microsoft.com</a>> wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex"><div class=3D"msg-2267519294106871571">
<div lang=3D"EN-US" style=3D"overflow-wrap: break-word;">
<div class=3D"m_-2267519294106871571WordSection1">
<p class=3D"MsoNormal">Thank you!<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Are you seeing problems with UDP traffic on the rece=
ive side? If everything works fine for you, I=E2=80=99m sending a patch.<u>=
</u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Long<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:Calibri=
,sans-serif">From:</span></b><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif"> Nandini Rangaswamy <<a href=3D"mailto:nandini.rangaswam=
y@broadcom.com" target=3D"_blank">nandini.rangaswamy@broadcom.com</a>>
<br>
<b>Sent:</b> Monday, September 16, 2024 3:58 PM<br>
<b>To:</b> Long Li <<a href=3D"mailto:longli@microsoft.com" target=3D"_b=
lank">longli@microsoft.com</a>><br>
<b>Cc:</b> Stephen Hemminger <<a href=3D"mailto:stephen@networkplumber.o=
rg" target=3D"_blank">stephen@networkplumber.org</a>>; <a href=3D"mailto=
:users@dpdk.org" target=3D"_blank">users@dpdk.org</a><br>
<b>Subject:</b> Re: Netvsc vs Failsafe Performance<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi=C2=A0Long,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">I tested this patch and it works as expected. The UD=
P IPv6 RSS offload bit is set and my dpdk app is able to successfully confi=
gure the netvsc port.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Nandini<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Fri, Sep 13, 2024 at 2:29<span style=3D"font-fami=
ly:Arial,sans-serif">=E2=80=AF</span>PM Nandini Rangaswamy <<a href=3D"m=
ailto:nandini.rangaswamy@broadcom.com" target=3D"_blank">nandini.rangaswamy=
@broadcom.com</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<p class=3D"MsoNormal">Thanks Long Li.<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">I shall try this patch and get back to you.<u></u><u=
></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Fri, Sep 13, 2024 at 2:27<span style=3D"font-fami=
ly:Arial,sans-serif">=E2=80=AF</span>PM Long Li <<a href=3D"mailto:longl=
i@microsoft.com" target=3D"_blank">longli@microsoft.com</a>> wrote:<u></=
u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">It=E2=80=99s a bug in=
netvsc for not reporting RTE_ETH_RSS_NONFRAG_IPV6_UDP. It is implied as in=
the case in IPV4.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Can you try the follo=
wing patch?</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">diff --git a/drivers/=
net/netvsc/hn_rndis.c b/drivers/net/netvsc/hn_rndis.c</span><u></u><u></u><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">index 1ba75ee804..fe1=
f04d8d9 100644</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">--- a/drivers/net/net=
vsc/hn_rndis.c</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">+++ b/drivers/net/net=
vsc/hn_rndis.c</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">@@ -717,6 +717,7 @@ h=
n_rndis_query_rsscaps(struct hn_data *hv,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 if (caps.ndis_caps & NDIS_RSS_CAP_IPV6)</span><u>=
</u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 hv-&g=
t;rss_offloads |=3D RTE_ETH_RSS_IPV6</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | RTE_ETH_RSS_NONFRAG_IPV6_TCP;<=
/span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">+=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | RTE_ETH_RSS_NONFRAG_IPV6_UDP;</sp=
an><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 if (caps.ndis_caps & NDIS_RSS_CAP_IPV6_EX)</span>=
<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 hv-&g=
t;rss_offloads |=3D RTE_ETH_RSS_IPV6_EX</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | RTE_ETH_RSS_IPV6_TCP_EX;</span=
><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:Calibri=
,sans-serif">From:</span></b><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif"> Nandini Rangaswamy <<a href=3D"mailto:nandini.rangaswam=
y@broadcom.com" target=3D"_blank">nandini.rangaswamy@broadcom.com</a>>
<br>
<b>Sent:</b> Friday, September 13, 2024 10:56 AM<br>
<b>To:</b> Stephen Hemminger <<a href=3D"mailto:stephen@networkplumber.o=
rg" target=3D"_blank">stephen@networkplumber.org</a>><br>
<b>Cc:</b> Long Li <<a href=3D"mailto:longli@microsoft.com" target=3D"_b=
lank">longli@microsoft.com</a>>;
<a href=3D"mailto:users@dpdk.org" target=3D"_blank">users@dpdk.org</a><br>
<b>Subject:</b> Re: Netvsc vs Failsafe Performance</span><u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal">Thanks for clarifying the question=C2=A0regarding Tx=
d size Stephen.<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">I tested out the RSS for TCP UDP.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">As suggested , I set the TCP flags alone in RSS conf=
and configured the netvsc port.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
122,62,157)">struct</span><span style=3D"font-size:9pt;font-family:"Co=
urier New";color:rgb(51,51,51)"> rte_eth_conf conf
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">{</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.intr_conf </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">{</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.lsc </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">!</span><span style=3D"font-size:9pt;font-family:"=
;Courier New";color:rgb(122,62,157)">dpdk</span><span style=3D"font-si=
ze:9pt;font-family:"Courier New";color:rgb(119,119,119)">.</span>=
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
122,62,157)">lsc_intr_disable</span><span style=3D"font-size:9pt;font-famil=
y:"Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">&&</span><span style=3D"font-size:9pt;font-fam=
ily:"Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">!</span><span style=3D"font-size:9pt;font-family:"=
;Courier New";color:rgb(122,62,157)">dpdk_if</span><span style=3D"font=
-size:9pt;font-family:"Courier New";color:rgb(119,119,119)">->=
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(122,62,157)">lsc_intr_disable</span><span style=3D"font-size:9pt;fon=
t-family:"Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">&&</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">!!(</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(122,62,157)">dev</span><span style=3D"font-size:9pt=
;font-family:"Courier New";color:rgb(119,119,119)">-></span><s=
pan style=3D"font-size:9pt;font-family:"Courier New";color:rgb(12=
2,62,157)">data</span><span style=3D"font-size:9pt;font-family:"Courie=
r New";color:rgb(119,119,119)">-></span><span style=3D"font-size:9p=
t;font-family:"Courier New";color:rgb(122,62,157)">dev_flags</spa=
n><span style=3D"font-size:9pt;font-family:"Courier New";color:rg=
b(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">&</span><span style=3D"font-size:9pt;font-family:&=
quot;Courier New";color:rgb(51,51,51)"> RTE_ETH_DEV_INTR_LSC</span><sp=
an style=3D"font-size:9pt;font-family:"Courier New";color:rgb(119=
,119,119)">),</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">},</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.rxmode </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">{</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.mq_mode </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)"> RTE_ETH_MQ_RX_RSS</span><span style=3D"=
font-size:9pt;font-family:"Courier New";color:rgb(119,119,119)">,=
</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.offloads </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)"> RTE_ETH_RX_OFFLOAD_VLAN_STRIP
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:"=
;Courier New";color:rgb(51,51,51)"> RTE_ETH_RX_OFFLOAD_IPV4_CKSUM
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">|</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">RTE_ETH_RX_OFFLOAD_RSS_HASH
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:"=
;Courier New";color:rgb(51,51,51)"> RTE_ETH_RX_OFFLOAD_UDP_CKSUM</span=
><span style=3D"font-size:9pt;font-family:"Courier New";color:rgb=
(119,119,119)">,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">},</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.</span><span style=3D"font-size:9pt;font-family:"Courier N=
ew";color:rgb(122,62,157)">rx_adv_conf</span><span style=3D"font-size:=
9pt;font-family:"Courier New";color:rgb(119,119,119)">.</span><sp=
an style=3D"font-size:9pt;font-family:"Courier New";color:rgb(122=
,62,157)">rss_conf</span><span style=3D"font-size:9pt;font-family:"Cou=
rier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">{</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.rss_hf </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)"> RTE_ETH_RSS_NONFRAG_IPV4_TCP
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:"=
;Courier New";color:rgb(51,51,51)"> RTE_ETH_RSS_NONFRAG_IPV6_TCP</span=
><span style=3D"font-size:9pt;font-family:"Courier New";color:rgb=
(119,119,119)">,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.rss_key </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)"> conf_rss_key</span><span style=3D"font-=
size:9pt;font-family:"Courier New";color:rgb(119,119,119)">,</spa=
n><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.rss_key_len
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New";color:rgb(51,51,51)"> rss_key_len</span><span style=3D=
"font-size:9pt;font-family:"Courier New";color:rgb(119,119,119)">=
,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">},</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.txmode </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">{</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.offloads </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)"> RTE_ETH_TX_OFFLOAD_UDP_CKSUM
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">|</span><span style=3D"font-size:9pt;font-family:"=
;Courier New";color:rgb(51,51,51)"> RTE_ETH_TX_OFFLOAD_IPV4_CKSUM</spa=
n><span style=3D"font-size:9pt;font-family:"Courier New";color:rg=
b(119,119,119)">,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">},</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">};</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<b><span style=3D"font-size:9pt;font-family:"Courier New";color:r=
gb(170,55,49)">rte_eth_dev_configure</span></b><span style=3D"font-size:9pt=
;font-family:"Courier New";color:rgb(119,119,119)">(</span><span =
style=3D"font-size:9pt;font-family:"Courier New";color:rgb(122,62=
,157)"><netvsc
port></span><span style=3D"font-size:9pt;font-family:"Courier New&=
quot;;color:rgb(119,119,119)">,</span><span style=3D"font-size:9pt;font-fam=
ily:"Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(122,62,157)">num_rxq</span><span style=3D"font-size:9pt;font-family:=
"Courier New";color:rgb(119,119,119)">,</span><span style=3D"font=
-size:9pt;font-family:"Courier New";color:rgb(122,62,157)">num_tx=
q</span><span style=3D"font-size:9pt;font-family:"Courier New";co=
lor:rgb(119,119,119)">,</span><span style=3D"font-size:9pt;font-family:&quo=
t;Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">&</span><span style=3D"font-size:9pt;font-family:&=
quot;Courier New";color:rgb(51,51,51)">conf</span><span style=3D"font-=
size:9pt;font-family:"Courier New";color:rgb(119,119,119)">);
</span><u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
122,62,157)">uint8_t</span><span style=3D"font-size:9pt;font-family:"C=
ourier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(122,62,157)">rss_key_temp</span><span style=3D"font-size:9pt;font-fa=
mily:"Courier New";color:rgb(119,119,119)">[</span><span style=3D=
"font-size:9pt;font-family:"Courier New";color:rgb(156,93,39)">64=
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">];</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
122,62,157)">struct</span><span style=3D"font-size:9pt;font-family:"Co=
urier New";color:rgb(51,51,51)"> rte_eth_rss_conf rss_conf
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">{</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.rss_key </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)"> rss_key_temp</span><span style=3D"font-=
size:9pt;font-family:"Courier New";color:rgb(119,119,119)">,</spa=
n><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">.rss_key_len
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:&qu=
ot;Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">sizeof(</span><span style=3D"font-size:9pt;font-family=
:"Courier New";color:rgb(51,51,51)">rss_key_temp</span><span styl=
e=3D"font-size:9pt;font-family:"Courier New";color:rgb(119,119,11=
9)">),</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">};</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">ret </span>
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
119,119,119)">=3D</span><span style=3D"font-size:9pt;font-family:"Cour=
ier New";color:rgb(51,51,51)">
</span><b><span style=3D"font-size:9pt;font-family:"Courier New";=
color:rgb(170,55,49)">rte_eth_dev_rss_hash_conf_get</span></b><span style=
=3D"font-size:9pt;font-family:"Courier New";color:rgb(119,119,119=
)">(</span><span style=3D"font-size:9pt;font-family:"Courier New"=
;color:rgb(122,62,157)"><VF
port></span><span style=3D"font-size:9pt;font-family:"Courier New&=
quot;;color:rgb(119,119,119)">,</span><span style=3D"font-size:9pt;font-fam=
ily:"Courier New";color:rgb(51,51,51)">
</span><span style=3D"font-size:9pt;font-family:"Courier New";col=
or:rgb(119,119,119)">&</span><span style=3D"font-size:9pt;font-family:&=
quot;Courier New";color:rgb(51,51,51)">rss_conf</span><span style=3D"f=
ont-size:9pt;font-family:"Courier New";color:rgb(119,119,119)">);=
</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:13.5pt;background:whitesmoke">
<span style=3D"font-size:9pt;font-family:"Courier New";color:rgb(=
51,51,51)">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal">Now the VF port RSS offloads show only TCP flags set=
and not UDP. I assumed that even the UDP flags might be set. Is this expec=
ted ?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Nandini=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">On Thu, Sep 12, 2024 at 4:09<span style=3D"font-fami=
ly:Arial,sans-serif">=E2=80=AF</span>PM Stephen Hemminger <<a href=3D"ma=
ilto:stephen@networkplumber.org" target=3D"_blank">stephen@networkplumber.o=
rg</a>>
wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin:5pt 0i=
n 5pt 4.8pt">
<p class=3D"MsoNormal">On Thu, 12 Sep 2024 13:47:37 -0700<br>
Nandini Rangaswamy <<a href=3D"mailto:nandini.rangaswamy@broadcom.com" t=
arget=3D"_blank">nandini.rangaswamy@broadcom.com</a>> wrote:<br>
<br>
> Thanks for your response Long Li.<br>
> I see with netvsc the maximum number of Tx descriptors is restricted t=
o<br>
> 4096 whereas the number of Rx descriptors is restricted to 8192.<br>
> But, for failsafe PMD , we see that both the number of Txd and Rxd is<=
br>
> restricted to 8192.<br>
> How is netvsc PMD giving the same performance as failsafe PMD ?<br>
> <br>
> Regards<br>
<br>
I think the limits there were somewhat arbitrary chose with netvsc.<br>
Don't remember a hard reason that would block larger sizes.<br>
<br>
<br>
Having really big rings won't help performance (i.e BufferBloat) and<br=
>
could a lot of memory consumption. When all heavy data traffic goes through=
<br>
the VF and that ring is different. Only DoS attacks should be impacted<br>
by rx/tx descriptor limits in the netvsc device. The linux driver actually<=
br>
has much smaller buffer.<u></u><u></u></p>
</blockquote>
</div>
</div>
<p class=3D"MsoNormal"><br>
<span style=3D"font-size:10pt;color:black;background:white">This electronic=
communication and the information and any files transmitted with it, or at=
tached to it, are confidential and are intended solely for the use of the i=
ndividual or entity to whom it is
addressed and may contain information that is confidential, legally privil=
eged, protected by privacy laws, or otherwise restricted from disclosure to=
anyone else. If you are not the intended recipient or the person responsib=
le for delivering the e-mail to
the intended recipient, you are hereby notified that any use, copying, dis=
tributing, dissemination, forwarding, printing, or copying of this e-mail i=
s strictly prohibited. If you received this e-mail in error, please return =
the e-mail to the sender, delete
it from your computer, and destroy any printed copy of it.</span><u></u><u=
></u></p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><br>
<span style=3D"font-size:10pt;color:black;background:white">This electronic=
communication and the information and any files transmitted with it, or at=
tached to it, are confidential and are intended solely for the use of the i=
ndividual or entity to whom it is
addressed and may contain information that is confidential, legally privil=
eged, protected by privacy laws, or otherwise restricted from disclosure to=
anyone else. If you are not the intended recipient or the person responsib=
le for delivering the e-mail to
the intended recipient, you are hereby notified that any use, copying, dis=
tributing, dissemination, forwarding, printing, or copying of this e-mail i=
s strictly prohibited. If you received this e-mail in error, please return =
the e-mail to the sender, delete
it from your computer, and destroy any printed copy of it.</span><u></u><u=
></u></p>
</div>
</div>
</div>
</div></blockquote></div>
<br>
<span style=3D"background-color:rgb(255,255,255)"><font size=3D"2">This ele=
ctronic communication and the information and any files transmitted with it=
, or attached to it, are confidential and are intended solely for the use o=
f the individual or entity to whom it is addressed and may contain informat=
ion that is confidential, legally privileged, protected by privacy laws, or=
otherwise restricted from disclosure to anyone else. If you are not the in=
tended recipient or the person responsible for delivering the e-mail to the=
intended recipient, you are hereby notified that any use, copying, distrib=
uting, dissemination, forwarding, printing, or copying of this e-mail is st=
rictly prohibited. If you received this e-mail in error, please return the =
e-mail to the sender, delete it from your computer, and destroy any printed=
copy of it.</font></span>
--000000000000c8ae1b06227ba79a--