Messages in this thread | | | Date | Fri, 10 Jun 2005 16:50:40 -0700 | From | "Martin J. Bligh" <> | Subject | Re: 2.6.12-rc6-mm1 |
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>> These tend to run together so just try adding my four patches together. In >> retrospect I guess they're likely candidates because they also change the >> _ratio_ of balance which they should not so they are buggy as a group >> currently. Easy enough to fix but it will make it easy to pinpoint the >> problem if they're responsible. >> >> sched-implement-nice-support-across-physical-cpus-on-smp.patch >> sched-change_prio_bias_only_if_queued.patch >> sched-account_rt_tasks_in_prio_bias.patch >> sched-smp-nice-bias-busy-queues-on-idle-rebalance.patch > > By the way it has already been decided to remove these patches from -mm > pending the completion of current scheduler work. If they turn out to be > responsible for this regression I apologise profusely :-|. > > It is clearer to me now that I have made a mistake with the priority biasing, > and the following patch corrects it to the planned behaviour. This is > academic at this stage as we won't be looking at this particular feature > again in earnest until the other 32 scheduler patches (and any followups) go > upstream. > > It's already known that schedstats data will be off without further code to > understand smp nice as well (thanks Nick for pointing out the data)... more > academic stuff but obviously something to consider when/if we get there.
OK, I backed out those 4, and the degredation mostly went away. See http://ftp.kernel.org/pub/linux/kernel/people/mbligh/abat/perf/kernbench.moe.png
and more specifically, see the +p5150 near the right hand side. I don't think it's quite as good as mainline, but much closer. I did this run with HZ=1000, and the the one with no scheduler patches at all with HZ=250, so I'll try to do a run that's more directly comparable as well
Thanks,
M.
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