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[Xen-users] Xen is 37x slower in processing a loop Fabian Zimmermann Mon Jan 16 15:00:06 2012

Hello everybody,

i just wondered why my xen-maschine is ~37 times slower in starting
processes as my workstation.

workstation:
time for id in $( seq 0 1000 ); do /bin/true; done
real    0m1.358s
user    0m1.142s
sys     0m0.090s
time /bin/true
real    0m0.002s
user    0m0.001s
sys     0m0.001s

xen 3.4.3 (2.6.18.8-xen, Lenny, AMD II X4, 16G RAM):
time for id in $( seq 0 1000 ); do /bin/true; done
real    0m49.318s
user    0m2.090s
sys     0m41.400s
time /bin/true
real    0m0.038s
user    0m0.010s
sys     0m0.010s

so my  xen-hosts needs ~37x more time to complete the loop and even a
simple /bin/true is >10x slower. The native CPU-performance is not
affected, compressing/openssl-benchmarks are running fine. Looks like
the host have some troubles in starting/switching processes.

Any ideas where to look at/start?

Thanks a lot,

Fabian

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