From: "Brian J. Murrell" <brian@interlinx.bc.ca>
To: kvm@vger.kernel.org
Cc: Sasha Levin <levinsasha928@gmail.com>
Subject: Re: 5x slower guest disk performance with virtio disk
Date: Thu, 15 Dec 2011 14:43:23 -0500 [thread overview]
Message-ID: <4EEA4DDB.5040203@interlinx.bc.ca> (raw)
In-Reply-To: <20111215172712.GC16183@redhat.com>
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On 11-12-15 12:27 PM, Daniel P. Berrange wrote:
> On Thu, Dec 15, 2011 at 07:16:22PM +0200, Sasha Levin wrote:
>> On Thu, 2011-12-15 at 11:55 -0500, Brian J. Murrell wrote:
>>> So, about 2/3 of host speed now -- which is much better. Is 2/3 about
>>> normal or should I be looking for more?
>>
>> aio=native
>>
>> Thats the qemu setting, I'm not sure where libvirt hides that.
>
> <disk ...>
> <driver io='threads|native'/>
> ...
> </disk>
When I try to "virsh edit" and add that "<driver io=.../>" it seems to
get stripped out of the config (as observed with "virsh dumpxml").
Doing some googling I discovered an alternate syntax (in message
https://www.redhat.com/archives/libvirt-users/2011-June/msg00004.html):
<driver name='qemu' type='raw' cache='none' io='native'/>
But the "io='native'" seems to get stripped out of that too.
FWIW, I have:
qemu-kvm-0.12.1.2-2.113.el6.x86_64
libvirt-client-0.8.1-27.el6.x86_64
installed here on CentOS 6.0. Maybe this aio= is not supported in the
above package(s)?
Cheers,
b.
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next prev parent reply other threads:[~2011-12-15 19:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-15 14:28 5x slower guest disk performance with virtio disk Brian J. Murrell
2011-12-15 15:47 ` Stefan Pietsch
2011-12-15 16:55 ` Brian J. Murrell
2011-12-15 17:16 ` Sasha Levin
2011-12-15 17:27 ` Daniel P. Berrange
2011-12-15 19:43 ` Brian J. Murrell [this message]
2011-12-16 2:47 ` Simon Wilson
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