* Re: Interested in Contributing to Kvm-kernel [ Networking project: reduce networking latency ]
[not found] <CALc02L7mGCYxNvrpwLz2-Vx8ABp5XuyQBVxZETyGd1Vx-Xvp=Q@mail.gmail.com>
@ 2016-11-21 16:19 ` Michael S. Tsirkin
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From: Michael S. Tsirkin @ 2016-11-21 16:19 UTC (permalink / raw)
To: Abhinav Gupta; +Cc: kvm
On Sat, Nov 19, 2016 at 01:15:53PM +0530, Abhinav Gupta wrote:
> Hello,
> I'm interested in taking ownership for the project reduce networking latency
> as mentioned on
>
> http://www.linux-kvm.org/page/NetworkingTodo#projects_in_need_of_an_owner
>
>
> • reduce networking latency:
>
> allow handling short packets from softirq or VCPU context
> Plan:
> We are going through the scheduler 3 times
> (could be up to 5 if softirqd is involved)
> Consider RX: host irq -> io thread -> VCPU thread ->
> guest irq -> guest thread.
> This adds a lot of latency.
> We can cut it by some 1.5x if we do a bit of work
> either in the VCPU or softirq context.
> Testing: netperf TCP RR - should be improved drastically
> netperf TCP STREAM guest to host - no regression
> Contact: MST
>
>
> I have a sound understanding of networking and c.
>
> Please can anyone recommend where I can start from in the source tree.
>
> Thanks,
> Abhinav Gupta
I'd start looking at vhost and tun drivers, ioeventfd and irqfd in kvm.
--
MST
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2016-11-21 16:19 ` Interested in Contributing to Kvm-kernel [ Networking project: reduce networking latency ] Michael S. Tsirkin
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