From: Igor Gutorov <igootorov@gmail.com>
To: yuying.zhang@intel.com
Cc: dev@dpdk.org
Subject: Re: [PATCH] net/i40e: increase descriptor queue length to 8160
Date: Wed, 5 Jun 2024 13:47:06 +0300 [thread overview]
Message-ID: <CAL7bPf2XP6sUcR7Zi8ZWG2YVsZxFJDKcARtqqw_sGYKBHjFCbg@mail.gmail.com> (raw)
In-Reply-To: <CAL7bPf0YX1JYE3dPt5jjkgK3ejCcSC-iXVAFP4Hvfj09sXFU4w@mail.gmail.com>
On Mon, Jun 3, 2024 at 1:41 PM Igor Gutorov <igootorov@gmail.com> wrote:
>
> On Mon, May 27, 2024 at 7:20 PM Igor Gutorov <igootorov@gmail.com> wrote:
> >
> > According to the Intel X710/XXV710/XL710 Datasheet, the maximum receive
> > queue descriptor length is 0x1FE0 (8160 in base 10). This is specified
> > as QLEN in table 8-12, page 1083.
> >
> > I've tested this change with an XXV710 NIC and it has positive effect on
> > performance under high load scenarios. Where previously I'd get
> > ~2000 packets/sec miss rate, now I get only ~40 packets/sec miss rate.
> >
> > Signed-off-by: Igor Gutorov <igootorov@gmail.com>
> > ---
> > drivers/net/i40e/i40e_rxtx.h | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/i40e/i40e_rxtx.h b/drivers/net/i40e/i40e_rxtx.h
> > index 2f2f890855..33fc9770d9 100644
> > --- a/drivers/net/i40e/i40e_rxtx.h
> > +++ b/drivers/net/i40e/i40e_rxtx.h
> > @@ -25,7 +25,7 @@
> > #define I40E_RX_MAX_DATA_BUF_SIZE (16 * 1024 - 128)
> >
> > #define I40E_MIN_RING_DESC 64
> > -#define I40E_MAX_RING_DESC 4096
> > +#define I40E_MAX_RING_DESC 8160
> >
> > #define I40E_FDIR_NUM_TX_DESC (I40E_FDIR_PRG_PKT_CNT << 1)
> > #define I40E_FDIR_NUM_RX_DESC (I40E_FDIR_PRG_PKT_CNT << 1)
> > --
> > 2.45.1
> >
>
> CC'ing to a different email (got an address rejected error, the
> MAINTAINERS file might need an update).
>
> Also, I've noticed that an X722 NIC is also supported by the i40e
> driver, but it seems the datasheet isn't on Intel's website for that
> NIC. Does anybody know if X722 has 4096 or 8160 usable descriptors? If
> someone could test this patch against X722, that would be great.
Apologies for pinging again. Who should I send my patch to? The
MAINTAINERS file shows Yuying Zhang as the maintainer of the net/i40e
driver and contains 2 emails, but both Yuying.Zhang@intel.com and
yuying.zhang@intel.com emails are non-existent (550 Address rejected).
next prev parent reply other threads:[~2024-06-05 10:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-27 16:19 Igor Gutorov
2024-06-03 10:41 ` Igor Gutorov
2024-06-05 10:47 ` Igor Gutorov [this message]
2024-06-06 9:18 ` Morten Brørup
2024-06-18 12:12 ` Bruce Richardson
2024-06-28 12:28 ` Bruce Richardson
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