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SubjectVolanoMark performance improvements (was: Re: volanoMark 12% regression with 2.6.25-rc6)

i just tried a handful of kernels with VolanoMark on an Intel quad-core
testbox, using java-1.6.0-openjdk-1.6.0.0-0.4.b06.fc9.

The result: v2.6.25 is the fastest ever Linux kernel in VolanoMark
testing, -rc7-to-be is ~41% faster than v2.6.24.2, and ~59% faster than
v2.6.21, in this Java benchmark:

v2.6.25-rc7-to-be:

Average throughput = 145613 messages per second
Average throughput = 142569 messages per second
Average throughput = 144963 messages per second
Average throughput = 144998 messages per second
Average throughput = 144213 messages per second
Average throughput = 144491 messages per second

v2.6.24.2:

Average throughput = 101351 messages per second
Average throughput = 99247 messages per second
Average throughput = 101155 messages per second
Average throughput = 103905 messages per second
Average throughput = 98345 messages per second
Average throughput = 102775 messages per second

v2.6.21:

Average throughput = 87630 messages per second
Average throughput = 91366 messages per second
Average throughput = 91317 messages per second
Average throughput = 91317 messages per second
Average throughput = 91359 messages per second
Average throughput = 92116 messages per second

these numbers are totally reproducible when running them over a long
time, i only included 6 runs for brevity. (A sidenote: the
/proc/sys/kernel/compat_sched_yield switch of 0 or 1 has no effect on
the .25-rc7 results, and it degraded the .24 results by about 35% so i
kept it off there.)

so i can see no 12% regression at all - but i have not tried all the
zillions of older, binary-only Java distributions.

So, to make the tests comparable, and to make some progress on this
matter, could you please try java-1.6.0-openjdk - what kind of
VolanoMark numbers do you get with it? If you still see a regression
with an open Java package too then could you please send me the .config
of your test-kernel? Thanks,

Ingo


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