linux-kernel - Re: [ANNOUNCE] Native Linux KVM tool v2

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Message-ID: <BANLkTi=Jm_50m6qyfQPCF0PuwUfuDNwMtg@mail.gmail.com>
Date:	Thu, 16 Jun 2011 08:45:03 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Alexander Graf <agraf@...e.de>
Cc:	Anthony Liguori <anthony@...emonkey.ws>,
	Prasad Joshi <prasadjoshi124@...il.com>,
	Avi Kivity <avi@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Asias He <asias.hejun@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2

On Thu, Jun 16, 2011 at 1:07 AM, Alexander Graf <agraf@...e.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.
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