From: Anthony Liguori <anthony@codemonkey.ws>
To: Thomas Mueller <thomas@chaschperli.ch>
Cc: kvm@vger.kernel.org
Subject: Re: qcow2 slowdown in kvm-78,79
Date: Wed, 19 Nov 2008 16:06:46 -0600 [thread overview]
Message-ID: <49248DF6.60201@codemonkey.ws> (raw)
In-Reply-To: <gg1qk4$bap$1@ger.gmane.org>
Thomas Mueller wrote:
> On Wed, 19 Nov 2008 12:26:41 -0600, Anthony Liguori wrote:
>
>>
>> This is probably the change to cache=writethrough. I bet if you set
>> cache=writeback then you'll see this go away.
>>
>
> this was it. cache=writeback and the throughput goes from 10mb/s to 80/mb/
> s with if=scsi
>
Yeah, we'll most likely switch back to cache=writeback for the default
for qcow2 images. qcow2 needs some lovin'.
Regards,
Anthony Liguori
> thanks.
>
> - Thomas
>
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next prev parent reply other threads:[~2008-11-19 22:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-18 14:39 qcow2 slowdown in kvm-78,79 Henrik Holst
2008-11-19 17:55 ` Thomas Mueller
2008-11-19 18:23 ` Ryan Harper
2008-11-19 18:26 ` Anthony Liguori
2008-11-19 19:49 ` Thomas Mueller
2008-11-19 22:06 ` Anthony Liguori [this message]
2008-11-19 23:47 ` walt
2008-11-20 1:00 ` Anthony Liguori
2008-11-20 7:57 ` Henrik Holst
2008-11-20 8:08 ` Henrik Holst
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