* Waiman Long <waiman.l...@hp.com> wrote:
> Testing done on a 4-socket Westmere-EX boxes with 40 cores (HT off)
> showed the following performance data (average kops/s) with various
> load factor (number of pause instructions) used in the critical
> section using an userspace mutex microbenchmark.
>
> Threads Load Waiting Futex Spinning Futex %Change
> ------- ---- ------------- -------------- -------
> 256 1 6894 8883 +29%
> 256 10 3656 4912 +34%
> 256 50 1332 4358 +227%
> 256 100 792 2753 +248%
> 10 1 6382 4838 -24%
> 10 10 3614 4748 +31%
> 10 50 1319 3900 +196%
> 10 100 782 2459 +214%
> 2 1 7905 7194 -9.0%
> 2 10 4556 4717 +3.5%
> 2 50 2191 4167 +90%
> 2 100 1767 2407 +36%
So the numbers look interesting - but it would be _really_ important
to provide noise/sttdev figures in a sixth column as well (denoted in
percentage units, not in benchmark units), so that we know how
significant a particular speedup (or slowdown) is.
Thanks,
Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
