Re: [Qemu-devel] interrupt mitigation for e1000

[Stefan Hajnoczi]

On Tue, Jul 24, 2012 at 5:58 PM, Luigi Rizzo <address@hidden> wrote:
> I noticed that the various NIC modules in qemu/kvm do not implement
> interrupt mitigation, which is very beneficial as it dramatically
> reduces exits from the hypervisor.
>
> As a proof of concept i tried to implement it for the e1000 driver
> (patch below), and it brings tx performance from 9 to 56Kpps on
> qemu-softmmu, and from ~20 to 140Kpps on qemu-kvm.
>
> I am going to measure the rx interrupt mitigation in the next couple
> of days.
>
> Is there any interest in having this code in ?

Seems useful, especially since you have benchmark results to show the
improvement.

Please include a Signed-off-by: line for the patch when you submit it.
 For details, see:
http://wiki.qemu.org/Contribute/SubmitAPatch

I have CCed folks who have worked on the e1000 model.

Stefan