DPDK patches and discussions
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From: Yong Wang <yongwang@vmware.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 0/5] vmxnet3 pmd fixes/improvement
Date: Mon, 13 Oct 2014 21:00:28 +0000
Message-ID: <edc61efd1bbf4798ac333a979405ed8b@EX13-MBX-026.vmware.com> (raw)
In-Reply-To: <6543312.my61QThjD7@xps13>

Only the last one is performance related and it merely tries to give hints to the compiler to hopefully make branch prediction more efficient.  It also moves a constant assignment out of the pkt polling loop.

We did performance evaluation on a Nehalem box with 4cores@2.8GHz x 2 socket:
On the DPDK-side, it's running some l3 forwarding apps in a VM on ESXi with one core assigned for polling.  The client side is pktgen/dpdk, pumping 64B tcp packets at line rate.  Before the patch, we are seeing ~900K PPS with 65% cpu of a core used for DPDK.  After the patch, we are seeing the same pkt rate with only 45% of a core used.  CPU usage is collected factoring our the idle loop cost.  The packet rate is a result of the mode we used for vmxnet3 (pure emulation mode running default number of hypervisor contexts).  I can add these info in the review request.

Yong
________________________________________
From: Thomas Monjalon <thomas.monjalon@6wind.com>
Sent: Monday, October 13, 2014 1:29 PM
To: Yong Wang
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 0/5] vmxnet3 pmd fixes/improvement

Hi,

2014-10-12 23:23, Yong Wang:
> This patch series include various fixes and improvement to the
> vmxnet3 pmd driver.
>
> Yong Wang (5):
>   vmxnet3: Fix VLAN Rx stripping
>   vmxnet3: Add VLAN Tx offload
>   vmxnet3: Fix dev stop/restart bug
>   vmxnet3: Add rx pkt check offloads
>   vmxnet3: Some perf improvement on the rx path

Please, could describe what is the performance gain for these patches?
Benchmark numbers would be appreciated.

Thanks
--
Thomas

  reply	other threads:[~2014-10-13 20:53 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-13  6:23 Yong Wang
2014-10-13  6:23 ` [dpdk-dev] [PATCH 1/5] vmxnet3: Fix VLAN Rx stripping Yong Wang
2014-10-13  9:31   ` Stephen Hemminger
2014-10-13 18:42     ` Yong Wang
2014-10-22 13:39       ` Stephen Hemminger
2014-10-28 21:57         ` Yong Wang
2014-10-29  9:04           ` Bruce Richardson
2014-10-29  9:41             ` Thomas Monjalon
2014-10-29 17:57               ` Yong Wang
2014-10-29 18:51                 ` Thomas Monjalon
2014-10-13  6:23 ` [dpdk-dev] [PATCH 2/5] vmxnet3: Add VLAN Tx offload Yong Wang
2014-10-13  6:23 ` [dpdk-dev] [PATCH 3/5] vmxnet3: Fix dev stop/restart bug Yong Wang
2014-10-13  6:23 ` [dpdk-dev] [PATCH 4/5] vmxnet3: Add rx pkt check offloads Yong Wang
2014-10-13  6:23 ` [dpdk-dev] [PATCH 5/5] vmxnet3: Some perf improvement on the rx path Yong Wang
2014-11-05  0:13   ` Thomas Monjalon
2014-10-13 20:29 ` [dpdk-dev] [PATCH 0/5] vmxnet3 pmd fixes/improvement Thomas Monjalon
2014-10-13 21:00   ` Yong Wang [this message]
2014-10-21 22:10     ` Yong Wang
2014-10-22  7:07       ` Cao, Waterman
2014-10-28 14:40         ` Thomas Monjalon
2014-10-28 19:59           ` Yong Wang
2014-10-29  0:33             ` Cao, Waterman
2014-11-05  1:32     ` Cao, Waterman
2014-11-04  5:57 ` Zhang, XiaonanX
2014-11-04 22:50   ` Thomas Monjalon
2014-11-05  5:26     ` Cao, Waterman

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