From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@qumranet.com>
Cc: kvm-devel@lists.sourceforge.net, Ryo Tsuruta <ryov@valinux.co.jp>,
dm-devel@redhat.com,
virtualization <virtualization@lists.linux-foundation.org>
Subject: Re: I/O bandwidth control on KVM
Date: Sun, 02 Mar 2008 12:08:39 -0600 [thread overview]
Message-ID: <47CAED27.10308@codemonkey.ws> (raw)
In-Reply-To: <47CAD9C7.90900@qumranet.com>
Avi Kivity wrote:
> Anthony Liguori wrote:
>>
>> If you are using virtio drivers in the guest (which I presume you are
>> given the reference to /dev/vda), try using the following -drive syntax:
>>
>> -drive file=/dev/mapper/ioband1,if=virtio,boot=on,cache=off
>>
>> This will force the use of O_DIRECT. By default, QEMU does not open
>> with O_DIRECT so you'll see page cache effects.
>>
>>
>
> Good point. But IIRC cache=off is not limited to virtio?
Nope. I just wanted to give the exact syntax to use and it looked like
he was using virtio.
Regards,
Anthony Liguori
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next prev parent reply other threads:[~2008-03-02 18:08 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-29 12:05 I/O bandwidth control on KVM Ryo Tsuruta
2008-03-02 4:18 ` Anthony Liguori
2008-03-02 16:45 ` Avi Kivity
2008-03-02 16:45 ` Avi Kivity
2008-03-02 18:08 ` Anthony Liguori [this message]
2008-03-02 18:08 ` Anthony Liguori
2008-03-04 6:41 ` [kvm-devel] " Ryo Tsuruta
2008-03-04 6:41 ` Ryo Tsuruta
2008-03-05 15:53 ` [kvm-devel] " Ryo Tsuruta
2008-03-05 15:53 ` Ryo Tsuruta
2008-03-05 16:30 ` Anthony Liguori
2008-03-05 16:30 ` Anthony Liguori
2008-03-06 12:23 ` Ryo Tsuruta
2008-03-06 12:23 ` Ryo Tsuruta
2008-03-06 16:05 ` [kvm-devel] " Anthony Liguori
2008-03-06 16:05 ` Anthony Liguori
2008-03-10 12:05 ` Ryo Tsuruta
2008-03-10 12:05 ` [kvm-devel] " Ryo Tsuruta
2008-03-02 4:18 ` Anthony Liguori
-- strict thread matches above, loose matches on Subject: below --
2008-02-29 12:05 Ryo Tsuruta
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