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

[Andreas Kinzler <ml-xen-devel@xxxxxx>]

On 03.05.2012 12:51, Ian Campbell wrote:
> On Thu, 2012-05-03 at 11:43 +0100, Andreas Kinzler wrote:
> > On 02.05.2012 15:31, Ian Campbell wrote:
> > > Did you happen to also compare 3.2.12 and 2.6.34.10 running these
> > > workloads natively?
> > Yes, I tested against 2.6.32.x. Differences exist, but are minor.
> Good to know, thanks for testing
>
> The other potential Xen perf thing which just occurred to to me is the
> ACPI power management stuff which the xen-acpi-processor patches in
> 3.4-rcN are fixing. These are necessary to enable things like turbo mode
> so have a pretty large perf impact.
>
> Are you able to try the latest 3.4-rc kernel?
Yes, meanwhile I tried 3.4-rc7. There is some improvement but still a good bit away from 
2.6.34 xenified:
time emerge apache:

                3.2.12-dom0     3.3.4-dom0 (w. patch)   3.4.0-rc7       
2.6.34.10-dom0
        real    1m0.560s        0m59.971s (0m58.029s)   0m55.000s       
0m47.689s
        user    0m40.939s       0m40.619s (0m40.291s)   0m37.846s       
0m41.355s
        sys     0m18.865s       0m18.305s (0m16.837s)   0m16.041s       
0m11.441s

time make -j4 (3.2.12 linux compile):

                3.2.12-dom0     3.3.4-dom0 (w. patch)   3.4.0-rc7       
2.6.34.10-dom0
        real    5m8.793s        5m4.888s  (5m1.408s)    4m48.839s       
4m20.576s
        user    8m1.746s        7m59.726s (7m57.534s)   7m40.129s       
7m10.375s
        sys     1m39.010s       1m32.994s (1m29.518s)   1m20.993s       
0m56.304s

Regards Andreas

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