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Re: [Qemu-devel] [PATCH v4 00/13] aio: experimental virtio-blk polling m
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v4 00/13] aio: experimental virtio-blk polling mode |
Date: |
Tue, 6 Dec 2016 09:27:32 +0000 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Mon, Dec 05, 2016 at 10:40:49AM -0600, Karl Rister wrote:
> On 12/05/2016 08:56 AM, Stefan Hajnoczi wrote:
> <snip>
>
> > Karl: do you have time to run a bigger suite of benchmarks to identify a
> > reasonable default poll-max-ns value? Both aio=native and aio=threads
> > are important.
> >
> > If there is a sweet spot that improves performance without pathological
> > cases then we could even enable polling by default in QEMU.
> >
> > Otherwise we'd just document the recommended best polling duration as a
> > starting point for users.
> >
>
> I have collected a baseline on the latest patches and am currently
> collecting poll-max-ns=16384. I can certainly throw in a few more
> scenarios. Do we want to stick with powers of 2 or some other strategy?
Excellent, thanks! The algorithm self-tunes by doubling poll time so
there's not much advantage to looking at non pow-2 values.
Thanks,
Stefan
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- Re: [Qemu-devel] [PATCH v4 12/13] aio: self-tune polling time, (continued)
[Qemu-devel] [PATCH v4 13/13] iothread: add poll-grow and poll-shrink parameters, Stefan Hajnoczi, 2016/12/01
Re: [Qemu-devel] [PATCH v4 00/13] aio: experimental virtio-blk polling mode, Paolo Bonzini, 2016/12/02
Re: [Qemu-devel] [PATCH v4 00/13] aio: experimental virtio-blk polling mode, Stefan Hajnoczi, 2016/12/02
Re: [Qemu-devel] [PATCH v4 00/13] aio: experimental virtio-blk polling mode, Fam Zheng, 2016/12/05
Re: [Qemu-devel] [PATCH v4 00/13] aio: experimental virtio-blk polling mode, Christian Borntraeger, 2016/12/05