From: "Yang, Zhiyong" <zhiyong.yang@intel.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "yuanhan.liu@linux.intel.com" <yuanhan.liu@linux.intel.com>
Subject: Re: [dpdk-dev] [PATCH 4/5] net/vhost: remove limit of vhost TX burst size
Date: Wed, 1 Mar 2017 13:24:16 +0000 [thread overview]
Message-ID: <E182254E98A5DA4EB1E657AC7CB9BD2A3EB73C29@BGSMSX101.gar.corp.intel.com> (raw)
In-Reply-To: <0ae31488-1ea6-abb8-7bd0-b5526dc9fc9f@redhat.com>
Hi, Maxime:
> -----Original Message-----
> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> Sent: Wednesday, March 1, 2017 5:44 PM
> To: Yang, Zhiyong <zhiyong.yang@intel.com>; dev@dpdk.org
> Cc: yuanhan.liu@linux.intel.com
> Subject: Re: [PATCH 4/5] net/vhost: remove limit of vhost TX burst size
>
>
>
> On 02/24/2017 09:48 AM, Zhiyong Yang wrote:
> > vhost removes limit of TX burst size(32 pkts) and supports to make an
> > best effort to transmit pkts.
> >
> > Cc: yuanhan.liu@linux.intel.com
> > Cc: maxime.coquelin@redhat.com
> >
> > Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
> > ---
> > drivers/net/vhost/rte_eth_vhost.c | 24 ++++++++++++++++++++++--
> > 1 file changed, 22 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/vhost/rte_eth_vhost.c
> > b/drivers/net/vhost/rte_eth_vhost.c
> > index e98cffd..1e1fa34 100644
> > --- a/drivers/net/vhost/rte_eth_vhost.c
> > +++ b/drivers/net/vhost/rte_eth_vhost.c
> > @@ -52,6 +52,7 @@
> > #define ETH_VHOST_QUEUES_ARG "queues"
> > #define ETH_VHOST_CLIENT_ARG "client"
> > #define ETH_VHOST_DEQUEUE_ZERO_COPY "dequeue-zero-copy"
> > +#define VHOST_MAX_PKT_BURST 32
> >
> > static const char *valid_arguments[] = {
> > ETH_VHOST_IFACE_ARG,
> > @@ -434,8 +435,27 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs,
> uint16_t nb_bufs)
> > goto out;
> >
> > /* Enqueue packets to guest RX queue */
> > - nb_tx = rte_vhost_enqueue_burst(r->vid,
> > - r->virtqueue_id, bufs, nb_bufs);
> > + if (likely(nb_bufs <= VHOST_MAX_PKT_BURST))
> > + nb_tx = rte_vhost_enqueue_burst(r->vid, r->virtqueue_id,
> > + bufs, nb_bufs);
> > + else {
> > + uint16_t nb_send = nb_bufs;
> > +
> > + while (nb_send) {
> > + uint16_t nb_pkts;
> > + uint16_t num = (uint16_t)RTE_MIN(nb_send,
> > + VHOST_MAX_PKT_BURST);
> > +
> > + nb_pkts = rte_vhost_enqueue_burst(r->vid,
> > + r->virtqueue_id,
> > + &bufs[nb_tx], num);
> > +
> > + nb_tx += nb_pkts;
> > + nb_send -= nb_pkts;
> > + if (nb_pkts < num)
> > + break;
> > + }
> > + }
> It looks like the if/else could be avoided, but maybe you did so for
> performance reason?
> If this is the case, maybe you could add a comment or at least state this in the
> commit message.
Yes, you are right.
if/else can be avoided and code will look more clean.
I choose performance between them.
Comments will be added in V2 here.
Thanks
Zhiyong
>
> Thanks,
> Maxime
> >
> > r->stats.pkts += nb_tx;
> > r->stats.missed_pkts += nb_bufs - nb_tx;
> >
next prev parent reply other threads:[~2017-03-01 13:24 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-24 8:48 [dpdk-dev] [PATCH 0/5] consistent PMD batching behaviour Zhiyong Yang
2017-02-24 8:48 ` [dpdk-dev] [PATCH 1/5] net/fm10k: remove limit of fm10k_xmit_pkts_vec burst size Zhiyong Yang
2017-02-24 9:32 ` Bruce Richardson
2017-02-24 9:36 ` Bruce Richardson
2017-02-24 9:48 ` Yang, Zhiyong
2017-03-03 11:17 ` [dpdk-dev] [PATCH v2 0/5] consistent PMD batching behaviour Zhiyong Yang
2017-03-03 11:17 ` [dpdk-dev] [PATCH v2 1/5] net/fm10k: remove limit of fm10k_xmit_pkts_vec burst size Zhiyong Yang
2017-03-29 7:16 ` [dpdk-dev] [PATCH v3 0/5] consistent PMD batching behaviour Zhiyong Yang
2017-03-29 7:16 ` [dpdk-dev] [PATCH v3 1/5] net/fm10k: remove limit of fm10k_xmit_pkts_vec burst size Zhiyong Yang
2017-03-29 7:16 ` [dpdk-dev] [PATCH v3 2/5] net/i40e: remove limit of i40e_xmit_pkts_vec " Zhiyong Yang
2017-03-29 7:16 ` [dpdk-dev] [PATCH v3 3/5] net/ixgbe: remove limit of ixgbe_xmit_pkts_vec " Zhiyong Yang
2017-03-29 7:16 ` [dpdk-dev] [PATCH v3 4/5] net/vhost: remove limit of vhost TX " Zhiyong Yang
2017-03-29 7:16 ` [dpdk-dev] [PATCH v3 5/5] net/vhost: remove limit of vhost RX " Zhiyong Yang
2017-03-30 12:54 ` [dpdk-dev] [PATCH v3 0/5] consistent PMD batching behaviour Ferruh Yigit
2017-03-31 7:00 ` Yao, Lei A
2017-03-03 11:17 ` [dpdk-dev] [PATCH v2 2/5] net/i40e: remove limit of i40e_xmit_pkts_vec burst size Zhiyong Yang
2017-03-24 14:03 ` Ferruh Yigit
2017-03-03 11:17 ` [dpdk-dev] [PATCH v2 3/5] net/ixgbe: remove limit of ixgbe_xmit_pkts_vec " Zhiyong Yang
2017-03-03 11:17 ` [dpdk-dev] [PATCH v2 4/5] net/vhost: remove limit of vhost TX " Zhiyong Yang
2017-03-03 11:17 ` [dpdk-dev] [PATCH v2 5/5] net/vhost: remove limit of vhost RX " Zhiyong Yang
2017-03-05 13:02 ` [dpdk-dev] [PATCH v2 0/5] consistent PMD batching behaviour Ananyev, Konstantin
2017-03-06 2:13 ` Yang, Zhiyong
2017-03-24 14:02 ` Ferruh Yigit
2017-03-25 6:29 ` Yang, Zhiyong
2017-03-28 10:00 ` Yang, Zhiyong
2017-03-28 10:05 ` Ferruh Yigit
2017-02-24 8:48 ` [dpdk-dev] [PATCH 2/5] net/i40e: remove limit of i40e_xmit_pkts_vec burst size Zhiyong Yang
2017-02-24 8:48 ` [dpdk-dev] [PATCH 3/5] net/ixgbe: remove limit of ixgbe_xmit_pkts_vec " Zhiyong Yang
2017-02-24 8:48 ` [dpdk-dev] [PATCH 4/5] net/vhost: remove limit of vhost TX " Zhiyong Yang
2017-02-24 11:08 ` Kevin Traynor
2017-02-24 13:04 ` Bruce Richardson
2017-02-24 13:33 ` Kevin Traynor
2017-03-01 9:44 ` Maxime Coquelin
2017-03-01 13:24 ` Yang, Zhiyong [this message]
2017-02-24 8:48 ` [dpdk-dev] [PATCH 5/5] net/vhost: remove limit of vhost RX " Zhiyong Yang
2017-02-24 11:41 ` Kevin Traynor
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