From: Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
To: Laurent Vivier <Laurent.Vivier-6ktuUTfB/bM@public.gmane.org>
Cc: kvm-devel <kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: Performance comparaison with dbench on KVM
Date: Thu, 24 May 2007 14:16:38 -0500 [thread overview]
Message-ID: <4655E496.3080003@codemonkey.ws> (raw)
In-Reply-To: <4655A4BA.5080108-6ktuUTfB/bM@public.gmane.org>
Laurent Vivier wrote:
> Anthony Liguori wrote:
>
> Hi Anthony,
>
> I didn't modify aio_init limit...
>
It would be pretty useful to give it a try. In qemu_aio_init() where
aio_init() get's called. If you just bump aio_threads and aio_num from
1 to, say, 32. You should see a big difference in SCSI performance.
Regards,
Anthony Liguori
> I made some benchmarks with liposix-aio, but results are worst with IDE and
> crashes with SCSI (because I need to make some additional works).
>
> It's the part on which I work now (to align buffers to avoid redundant buffer
> copy and open image disk with O_DIRECT).
>
> Regards,
> Laurent
>
>
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next prev parent reply other threads:[~2007-05-24 19:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-24 14:23 Performance comparaison with dbench on KVM Laurent Vivier
[not found] ` <46559FDF.5000609-6ktuUTfB/bM@public.gmane.org>
2007-05-24 14:36 ` Anthony Liguori
[not found] ` <4655A307.3080707-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-05-24 14:44 ` Laurent Vivier
[not found] ` <4655A4BA.5080108-6ktuUTfB/bM@public.gmane.org>
2007-05-24 19:16 ` Anthony Liguori [this message]
[not found] ` <4655E496.3080003-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-05-25 11:51 ` Laurent Vivier
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