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From: ustermann.max@web.de
To: xen-devel@lists.xen.org
Subject: performance save/restore under xen-4.3.2 compared to kvm/qemu
Date: Mon, 25 Aug 2014 14:06:38 +0200	[thread overview]
Message-ID: <trinity-1f7452a7-8777-4716-b436-28736e94521d-1408968398663@3capp-webde-bs51> (raw)

Hello everybody,

i hope, i am right here with my question.

i have an vm with 1 GB main memory under Xen-4.3.2, if i measure the times for save and restore via "time", i got the following values:

save:
real    0m12.136s
user    0m0.175s
sys     0m2.662s
                                                
restore:
real    0m8.639s
user    0m0.468s
sys     0m1.807s


if i do the same with an vm under kvm/qemu (1GB main memory), i got this values:

save:
real    0m10.024s
user    0m0.008s
sys     0m0.003s

restore:
real    0m0.525s
user    0m0.015s
sys     0m0.004s


the host hardware is in both cases the same.
i´m real surprise about the huge difference for the needed time for restore, also that xen use much more time in kernel-mode (sys).
Can anyone give me some hints from where this difference can came?
Is there a way to speedup the restore-process in xen?

I´m thankful for every hint

all the best 
max

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             reply	other threads:[~2014-08-25 12:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-25 12:06 ustermann.max [this message]
2014-08-25 12:23 ` performance save/restore under xen-4.3.2 compared to kvm/qemu Andrew Cooper
2014-08-25 12:35   ` Jan Beulich
2014-08-25 12:38     ` Andrew Cooper
2014-08-25 13:02       ` Jan Beulich
2014-08-26 10:29     ` David Vrabel
2014-08-25 13:35   ` max ustermann
2014-08-25 13:50     ` Andrew Cooper

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