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[Xen-users] strange behaviour of domU - i/o performance tests

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Subject: [Xen-users] strange behaviour of domU - i/o performance tests
From: Michael Mey <michael.mey@xxxxxx>
Date: Thu, 9 Feb 2006 17:37:06 +0100
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I am currently making some i/o performance tests within domUs with iozone3.

One scenario is a domU with file-backed VBDs (root and swap) as sda1 and sda2 
lying on an nfs-kernel-server ( - Debian Sarge).

The exact iozone command is:
iozone -a -R -b result.xls -f /tmp/iozone.test -n 1m -g 256m -i 0 -i 1

As soon as the iozone-test comes to a filesize of 132M, the complete! system 
(including dom0) hangs, no more access possible! Every time the complete 
system has to be rebooted.

I experienced this behaviour both with Xen 3.0.0 and Xen 3.0.1 compiled from 
source. It is an reproducable error.

I'd appreciate if anyone had a clue on why this is happening or had made some 
similar experience.

Thanks, regards,


Michael Mey                                  
Thinking Objects Software GmbH    |   mailto: michael.mey@xxxxxx 
Lilienthalstrasse 2/1             |   phone: +49 711 88770-147
70825 Stuttgart-Korntal, Germany  |   fax: +49 711 88770-449

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