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Re: [Qemu-devel] interrupt mitigation for e1000
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] interrupt mitigation for e1000 |
Date: |
Wed, 25 Jul 2012 08:47:51 +0100 |
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