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From: Thomas Knauth <thomas.knauth@gmx.de>
To: Eric Blake <eblake@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] kvm suspend performance
Date: Sat, 23 Mar 2013 13:42:06 +0100	[thread overview]
Message-ID: <CABhLV00LaBOjuMEhwUH41Z4cs8Mbfn4MMLBu+r8jKQ69SZRS_A@mail.gmail.com> (raw)
In-Reply-To: <514A4104.9000505@redhat.com>

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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

​https://www.dropbox.com/s/nhosknq02lnn4hz/resumetime-vs-dumpsize.pdf

Thanks,
Thomas.

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  reply	other threads:[~2013-03-23 12:42 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-19 16:24 [Qemu-devel] kvm suspend performance Thomas Knauth
2013-03-20  8:11 ` Stefan Hajnoczi
2013-03-20 22:44   ` Thomas Knauth
2013-03-20 23:06     ` Eric Blake
2013-03-23 12:42       ` Thomas Knauth [this message]
2013-03-25 15:05         ` Eric Blake

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