Re: [Xen-users] Xen is 37x slower in processing a loop

[Florian Heigl <florian.heigl@xxxxxxxxx>]

Hi,

> Any ideas where to look at/start?

please start by doing the comparisms using the same system, and then
look into different domU kernels.
This, for example is on my irc VM, running 2.6.26-2 debian kernel on a
squeeze host.
The VM is actually even cpu capped to 70% of one i7 core.

$ time for id in $( seq 0 1000 ); do /bin/true; done

real    0m1.14s
user    0m0.21s
sys     0m0.57s

If it's taking 40s(!) for you then start looking for disk trashing in
the host, too.
i.e. md_resync used to completely abuse servers while it was running.

Greets,
Florian

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