Messages in this thread |  | | Subject | Re: [PATCH 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning | From | Mike Galbraith <> | Date | Thu, 10 Jan 2013 20:30:13 +0100 |
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On Thu, 2013-01-10 at 10:31 -0500, Rik van Riel wrote: > On 01/10/2013 10:19 AM, Mike Galbraith wrote: > > On Tue, 2013-01-08 at 17:26 -0500, Rik van Riel wrote: > > > >> Please let me know if you manage to break this code in any way, > >> so I can fix it... > > > > I didn't break it, but did let it play with rq->lock contention. Using > > cyclictest -Smp99 -i 100 -d 0, with 3 rt tasks for pull_rt_task() to > > pull around appears to have been a ~dead heat. > > Good to hear that the code seems to be robust. It seems to > help prevent performance degradation in some workloads, and > nobody seems to have found regressions yet.
I had hoped for a bit of positive, but a wash isn't surprising given the profile. I tried tbench too, didn't expect to see anything at all there, and got that.. so both results are positive in that respect.
-Mike
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