* Waiman Long <Waiman.Long@xxxxxx> wrote: > On 04/16/2013 05:12 AM, Ingo Molnar wrote: > >* Waiman Long<Waiman.Long@xxxxxx> 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. Ok, that's cool! Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
