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Groups > linux.kernel > #1171206
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC][PATCH 00/13] percpu rwsem -v2 |
| Date | 2015-06-24 11:10 +0200 |
| Message-ID | <pEOQV-5nk-3@gated-at.bofh.it> (permalink) |
| References | (4 earlier) <pExwK-5pz-1@gated-at.bofh.it> <pExQ6-5MB-29@gated-at.bofh.it> <pEAEi-1rm-13@gated-at.bofh.it> <pECd4-3LE-15@gated-at.bofh.it> <pEOxA-4Lc-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Jun 24, 2015 at 10:46:48AM +0200, Ingo Molnar wrote: > > > > flock02 > > > > mean variance sigma max min > > > > tip-1 11.8994 0.5874 0.7664 13.2022 8.6324 > > > > tip-2 11.7394 0.5252 0.7247 13.2540 9.7513 > > > > tip-3 11.8155 0.5288 0.7272 13.2700 9.9480 > > > > tip+percpu-rswem-1 15.3601 0.8981 0.9477 16.8116 12.6910 > > > > tip+percpu-rswem-2 15.2558 0.8442 0.9188 17.0199 12.9586 > > > > tip+percpu-rswem-3 15.5297 0.6386 0.7991 17.4392 12.7992 > [ Such high variance is often caused by (dynamically) unstable load balancing and > the workload never finding a good equilibrium. Any observable locking overhead > is usually just a second order concern or a symptom. Assuming the workload > context switches heavily. ] flock02 is a relatively stable benchmark -- unlike some of the others where the variance is orders of magnitude higher than the avg. But yes, I'll go poke at it more. I just need to hunt down unrelated fail before continuing with this. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [RFC][PATCH 00/13] percpu rwsem -v2 Ingo Molnar <mingo@kernel.org> - 2015-06-24 10:50 +0200
Re: [RFC][PATCH 00/13] percpu rwsem -v2 Peter Zijlstra <peterz@infradead.org> - 2015-06-24 11:10 +0200
Re: [RFC][PATCH 00/13] percpu rwsem -v2 Daniel Wagner <daniel.wagner@bmw-carit.de> - 2015-06-24 11:20 +0200
Re: [RFC][PATCH 00/13] percpu rwsem -v2 Linus Torvalds <torvalds@linux-foundation.org> - 2015-07-02 00:00 +0200
Re: [RFC][PATCH 00/13] percpu rwsem -v2 Peter Zijlstra <peterz@infradead.org> - 2015-07-02 11:50 +0200
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