[Xen-users] Xend highly uses CPU with multiprocessor setup

[Peter Viskup <skupko.sk@xxxxxxxxx>]

Hi all,
I am experiencing issue on freshly upgraded Debian Squeeze with Xen 
4.0.1 from Debian repositories.
After upgrade the system with Xen was slow - no iowaits only Steal time 
was high. I tried workarounds regarding ACPI - only acpi=off was working 
but the performance decrease was quite large due to only one CPU core 
was active at that time.
The last workaround I am running right now is to set dom0_cpus to 1 in 
xend-config.sxp. But this set dom0 cpus except the first one to paused 
state and the dynamic configuration changes are not propagated to domUs 
(e.g. memory [in/de]crease).
Can anybody tell me how to handle dom0_cpus correctly and what can be 
the issue with multiprocessor setup of xend - the high cpu usage?
I already sent bugreport to Debian [1], but with no answer till now.
Thanks.

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683170

Best regards,
--
Peter Viskup

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