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Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool

From: Avi Kivity
Subject: Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool
Date: Tue, 09 Dec 2008 19:16:51 +0200
User-agent: Thunderbird (X11/20081119)

Gerd Hoffmann wrote:
Well, I see a massive slowdown when switching from sync to aio in the
xen backend code.  I think the reason is that due to the lack of a
vectored interface (and thus /me submitting separate aio requests for
each iovec element) stuff gets parallelized *way* too much and disk seek
times are killing me.

Try switching to the deadline io scheduler. cfq has a known issue with this.

error compiling committee.c: too many arguments to function

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