[Xen-users] How to run DomUs on more CPUs?

[Robert Valik <xen@xxxxxxxxxxxxxxx>]

Hello!

I run Xen environment on Gentoo (built following how-to on Gentoo Wiki - 
http://gentoo-wiki.com/HOWTO_Xen_and_Gentoo). It is Xen 3.0.2 with 
2.6.16.28 kernel.
It is a server with two Xeons. Xen "knows" all four cores (at least he 
sais so in /proc/cpuinfo and top).
Three DomUs run there. I have noticed that all three DomUs use just only 
first core of first CPU.
Output from top when all three DomUs are "under pressure":

Cpu0  :  0.0% us,  0.7% sy,  0.0% ni,  *0.0% id*, 97.3% wa,  1.0% hi, 
1.0% si
Cpu1  :  0.0% us,  0.0% sy,  0.0% ni, *100.0% id*,  0.0% wa,  0.0% hi, 
0.0% si
Cpu2  :  0.0% us,  0.0% sy,  0.0% ni, *100.0% id*,  0.0% wa,  0.0% hi, 
0.0% si
Cpu3  :  0.0% us,  0.0% sy,  0.0% ni, *100.0% id*,  0.0% wa,  0.0% hi, 
0.0% si
Is there som way to tell Xen to distribute the load to other cores? Or 
to tell what DomU should use what CPU? I tried this with different 
setting of cpus variable (including cpus="") in the configuration of 
DomUs but with no effect.
I would be happy if someone could explain me what I should do.

Thanks!

--
Best regards!

Robert Valík
Research & Development Dept.

VisionMedia s.r.o.
Kopčianska 20
851 01 Bratislava

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