[ovs-dev] 答复: [PATCH v6] Use TPACKET_V3 to accelerate veth for userspace datapath

[William Tu]

On Tue, Mar 17, 2020 at 2:08 AM Yi Yang (杨燚)-云服务集团 <yangyi01 at inspur.com> wrote:
>
> Hi, William
>
> Finally, my highend server is available and so I can do performance comparison again, tpacket_v3 obviously has big performance improvement, here is my data. By the way, in order to get stable performance data, please use taskset to pin ovs-vswitchd to a physical core (you shouldn't schedule other task to its logical sibling core for stable performance data), iperf3 client an iperf3 use different cores, for my case, ovs-vswitchd is pinned to core 1, iperf3 server is pinned to core 4, iperf3 client is pinned to core 5.
>
> According to my test, tpacket_v3 can get about 55% improvement (from 1.34 to 2.08,  (2.08-1.34)/1.34 = 0.55) , with my further optimization (use zero copy for receive side), it can have more improvement (from 1.34 to 2.21, (2.21-1.34)/1.34 = 0.65), so I still think performance improvement is big, please reconsider it again.
>

That's great improvement.
What is your optimization "zero copy for receive side"?
Does it include in the patch?

Regards
William