From: Anthony Liguori <anthony@codemonkey.ws>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Prateek Sharma <prateek3.14@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] virtio-blk throughput
Date: Mon, 13 Feb 2012 07:48:25 -0600 [thread overview]
Message-ID: <4F3914A9.8080004@codemonkey.ws> (raw)
In-Reply-To: <CAJSP0QWdGWLuxR7cp8tt=aDMFKxzVEEJTXwNn7iqsnXHYoc5XQ@mail.gmail.com>
On 02/13/2012 05:23 AM, Stefan Hajnoczi wrote:
> On Sat, Feb 11, 2012 at 9:57 AM, Prateek Sharma<prateek3.14@gmail.com> wrote:
>> $QEMU -cpu core2duo,+vmx -drive file=$VM_PATH,if=virtio,aio=native
>> -drive file=viotest.img,if=virtio,index=2
>
> -drive cache=none is typically used for good performance when the
> image is on a local disk. Try that and I think you'll see an
> improvement.
We should throw a bug on aio=native, cache != none.
linux-aio blocks on io_submit if the caching mode isn't O_DIRECT and that will
kill performance.
Regards,
Anthony Liguori
>
> Stefan
>
prev parent reply other threads:[~2012-02-13 13:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-11 9:57 [Qemu-devel] virtio-blk throughput Prateek Sharma
2012-02-13 11:23 ` Stefan Hajnoczi
2012-02-13 11:39 ` Prateek Sharma
2012-02-13 14:11 ` Stefan Hajnoczi
2012-02-13 13:48 ` Anthony Liguori [this message]
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