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Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead
From: |
Anthony Liguori |
Subject: |
Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead |
Date: |
Thu, 29 Nov 2012 13:02:40 -0600 |
User-agent: |
Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
"Michael S. Tsirkin" <address@hidden> writes:
> On Thu, Nov 29, 2012 at 06:34:46PM +0530, Amit Shah wrote:
>> On (Wed) 28 Nov 2012 [23:53:08], Michael S. Tsirkin wrote:
>> > On Tue, Nov 27, 2012 at 06:25:04PM +0200, Michael S. Tsirkin wrote:
>> > > On Thu, Nov 01, 2012 at 06:07:21PM +0200, Michael S. Tsirkin wrote:
>> > > > Commit 0d8d7690850eb0cf2b2b60933cf47669a6b6f18f introduced
>> > > > a regression in virtio-net performance because it looks
>> > > > into the ring aggressively while we really only care
>> > > > about a single packet worth of buffers.
>> > > > To fix, add parameters limiting lookahead, and
>> > > > use in virtqueue_avail_bytes.
>> > > >
>> > > > Signed-off-by: Michael S. Tsirkin <address@hidden>
>> > > > Reported-by: Edivaldo de Araujo Pereira <address@hidden>
>> > >
>> > > Ping.
>> > > Anthony - going to apply this?
>> >
>> > virtio rng was added since so naturally build broke.
>> > Here's a patch on top to fix it up. I never used virtio rng before so
>> > could not test at this hour, but it does fix the build.
>> >
>> > I'll take a look at how to test it tomorrow but any
>> > info would be appreciated.
>> > Amit could you pls review?
>>
>> Looks fine, I assume you will send a v2 of the patch to Anthony?
>>
>> Amit
>
>
> Anthony volunteered to test this so there will only be v2 if he sees
> problems.
I need a Signed-off-by so why don't you just go ahead and send a v2 and
I'll test that.
Regards,
Anthony Liguori
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead, (continued)
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead, Michael S. Tsirkin, 2012/11/27
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead, Edivaldo de Araujo Pereira, 2012/11/27
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead, Anthony Liguori, 2012/11/27
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead, Michael S. Tsirkin, 2012/11/28
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead, Amit Shah, 2012/11/29
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead, Michael S. Tsirkin, 2012/11/29
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead,
Anthony Liguori <=
- Re: [Qemu-devel] [PATCH] virtio: limit avail bytes lookahead, Michael S. Tsirkin, 2012/11/29