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Re: [Qemu-devel] [PATCH] iothread: enable AioContext polling by default

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH] iothread: enable AioContext polling by default
Date: Tue, 31 Jan 2017 17:09:44 +0000
User-agent: Mutt/1.7.1 (2016-10-04)

On Thu, Jan 26, 2017 at 05:01:19PM +0000, Stefan Hajnoczi wrote:
> IOThread AioContexts are likely to consist only of event sources like
> virtqueue ioeventfds and LinuxAIO completion eventfds that are pollable
> from userspace (without system calls).
> We recently merged the AioContext polling feature but didn't enable it
> by default yet.  I have gone back over the performance data on the
> mailing list and picked a default polling value that gave good results.
> Let's enable AioContext polling by default so users don't have another
> switch they need to set manually.  If performance regressions are found
> we can still disable this for the QEMU 2.9 release.
> Cc: Paolo Bonzini <address@hidden>
> Cc: Christian Borntraeger <address@hidden>
> Cc: Karl Rister <address@hidden>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
>  iothread.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)

Thanks, applied to my block tree:


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