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Re: [Qemu-devel] kvm suspend performance
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] kvm suspend performance |
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Date: |
Mon, 25 Mar 2013 09:05:31 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 |
On 03/23/2013 06:42 AM, Thomas Knauth wrote:
> Hi Eric,
>
> thanks for the reply. This indeed solved my issue. Suspending is much
> faster without the artificial throttle.
>
> On a related note: I'm curious about the baseline resume latency. It takes
> about 5 seconds to resume an instance with a tiny amount of state (500 MB
> dump size). The data is all in the page cache. I measure the time it takes
> the 'virsh restore <dump file>' command to return.
>
> Any opinions on what could be the issue here? I've also linked to a figure
> illustrating the problem. Resume speed scales nicely with increased dump
> size, but the baseline penalty feels awfully high
Sorry, but I haven't ever profiled it to see where the problems might
lie. It sounds like it might be an interesting project if you want to
take it on, but I don't have the time to spend on it myself at the moment.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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