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Re: [Qemu-devel] is it possible to use a disk with multiple iothreads ?
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] is it possible to use a disk with multiple iothreads ? |
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Date: |
Mon, 27 Oct 2014 13:19:58 +0000 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Fri, Oct 24, 2014 at 03:39:52PM +0200, Alexandre DERUMIER wrote:
> >>Regarding Ceph, do you know why it burns a lot of CPU?
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> I'm currently doing some perfs to find why is so huge.
>
> One thing is that qemu+ qemu rbd block driver + librbd seem to use 2-3x more
> cpu, than passing krbd /dev/rbd0 from host to qemu.
> Don't known yet if the problem is librbd or qemu rbd block driver.
That's very interesting! Please keep Josh and me in CC when you want to
discuss the results.
Stefan
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