[dpdk-dev] [PATCH 0/5] vmxnet3 pmd fixes/improvement
Yong Wang
yongwang at vmware.com
Mon Oct 13 23:00:28 CEST 2014
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 at 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 at 6wind.com>
Sent: Monday, October 13, 2014 1:29 PM
To: Yong Wang
Cc: dev at 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
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