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

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:

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
        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
        real    5m8.793s        5m4.888s        4m20.576s
        user    8m1.746s        7m59.726s       7m10.375s
        sys     1m39.010s       1m32.994s       0m56.304s

Regards Andreas

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