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Date: Thu, 16 Jun 2011 08:45:03 +0300
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Subject: Re: [ANNOUNCE] Native Linux KVM tool v2
From: Pekka Enberg <penberg@kernel.org>
To: Alexander Graf <agraf@suse.de>
Cc: Anthony Liguori <anthony@codemonkey.ws>,
        Prasad Joshi <prasadjoshi124@gmail.com>, Avi Kivity <avi@redhat.com>,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@elte.hu>, Sasha Levin <levinsasha928@gmail.com>,
        Cyrill Gorcunov <gorcunov@gmail.com>, Asias He <asias.hejun@gmail.com>,
        Jens Axboe <jaxboe@fusionio.com>
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On Thu, Jun 16, 2011 at 1:07 AM, Alexander Graf <agraf@suse.de> wrote:
>> qemu-system-x86_64 -drive file=/dev/shm/test.qcow2,cache=writeback,if=virtio
>
> Wouldn't this still be using threaded AIO mode? I thought KVM tools used native AIO?

We don't use AIO at all. It's just normal read()/write() with a thread
pool. I actually looked at AIO but didn't really see why we'd want to
use it.