Re: [Xen-devel] Poor performance with Linux 3.x as dom0

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 2 May 2012, Andreas Kinzler wrote:
> Hello Jeremy + Konrad + all kernel devs,
> 
> while it is great to see that vanilla dom0 seems to work, the 
> performance breakdown compared to xenified 2.6.34 (from opensuse) is 
> huge. Here are my benchmarks:
> 

Thanks for running benchmarks!


> Xen 4.1.1, Xeon E5620, Supermicro X8DTi-F, 12 GB RAM, dom0 2 VCPUs
> 
> time emerge apache:
> 
>               3.2.12-dom0     3.3.4-dom0      2.6.34.10-dom0
>       real    1m0.560s        0m59.971s       0m47.689s
>       user    0m40.939s       0m40.619s       0m41.355s
>       sys     0m18.865s       0m18.305s       0m11.441s
> 
> time make -j4 (3.2.12 linux compile):
> 
>               3.2.12-dom0     3.3.4-dom0      2.6.34.10-dom0
>       real    5m8.793s        5m4.888s        4m20.576s
>       user    8m1.746s        7m59.726s       7m10.375s
>       sys     1m39.010s       1m32.994s       0m56.304s

Just for clarity, are you running this in dom0 (not in a VM), correct?

If you are running the test in a VM, is it a PV or an HVM guest? What is
the guest kernel version? What is the vcpu and memory configuration?
And finally, what are you using as the disk image (file or LVM)?

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