[Xen-users] Xen 4.1 and 3.0 kernel CPU performance

[Kommeri Jukka <jukka.kommeri@xxxxxxxx>]

Hello all,

I have been running different benchmarks on paravirtualized domU. I have 
run into strange performance drops with CPU intesive benchmarks (64-bit 
BurnInSSE & 64-bit Linpack test).
With Linpack test the performance of Xen is 90% of hardware where KVM is 
only about 1-2% worse than hardware. This is something new to me as I am 
used to better performance with older Xen versions.
I have a Dell R410 with two Xeon E5520 processors and I am running Ubuntu 
Lucid on both domU and dom0. The Xen settings are pretty much default, 
though I did try varying credit scheduler weights without any success.
Has anybody else noticed the same or have I just forgot something 
essential from my kernel?
Best regards,
Jukka Kommeri

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