On 04/16/2013 05:12 AM, Ingo Molnar wrote:
* Waiman Long<waiman.l...@hp.com> wrote:
[...]
Patches 2 improves the mutex spinning process by reducing contention among the
spinners when competing for the mutex. This is done by using a MCS lock to put
the spinners in a queue so that only the first spinner will try to acquire the
mutex when it is available. This patch showed significant performance
improvement of +30% on the AIM7 fserver and new_fserver workload.
Ok, that's really nice - and this approach has no arbitrary limits/tunings in
it.
Do you have a performance comparison to your first series (patches 1+2+3 IIRC) -
how does this new series with MCS locking compare to the best previous result
from
that old series? Do we now achieve that level of performance?
Compared with the old patch set, the new patches 1+2 have over 30%
performance gain in high user load (1100-1500) in the fserver and
new_fserver workloads. The old patches 1+2 or 1+3 only manages around
10% gain. In the intermediate range of 200-1000, the 2 sets are more
comparable in performance gain.
Regards,
Longman
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