Messages in this thread |  | | | Date | Fri, 10 Jun 2005 09:02:14 +0200 | | From | Ingo Molnar <> | | Subject | Re: 2.6.12-rc6-mm1 |
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* Martin J. Bligh <mbligh@mbligh.org> wrote:
> > I'm assuming it was the CPU scheduler patches. There are 36 of them ;) > > Backed them all out ... performance thunks down to earth again, and is > actually the best I've seen it ever (probably 250Hz is helping, I used > to run 100 in -mjb for better benefit). > > the +5081 item is the one to look at > http://ftp.kernel.org/pub/linux/kernel/people/mbligh/abat/perf/kernbench.moe.png > > Patch I used was here: > > http://ftp.kernel.org/pub/linux/kernel/people/mbligh/abat/patches/nosched > > But it was just everything under the "CPU scheduler" section of your > series file.
we know from Nick's testing that the patches up to and including dynamic-sched-domains-ia64-changes.patch are probably OK. So the candidates for the regression are:
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 consolidate-preempt-options-into-kernel-kconfigpreempt.patch enable-preempt_bkl-on-preemptsmp-too.patch sched-tweak-idle-thread-setup-semantics.patch sched-voluntary-kernel-preemption.patch sched-smp-nice-bias-busy-queues-on-idle-rebalance.patch sched-task_noninteractive.patch sched-run-sched_normal-tasks-with-real-time-tasks-on-smt-siblings.patch
there are two feature patches in this:
enable-preempt_bkl-on-preemptsmp-too.patch sched-voluntary-kernel-preemption.patch
so make sure you have PREEMPT_BKL and PREEMPT_VOLUNTARY disabled.
these ones should not impact your workload's functionality (unless they are buggy):
sched-account_rt_tasks_in_prio_bias.patch consolidate-preempt-options-into-kernel-kconfigpreempt.patch sched-tweak-idle-thread-setup-semantics.patch sched-run-sched_normal-tasks-with-real-time-tasks-on-smt-siblings.patch
and unless you are using separate nice levels, this one shouldnt make a difference in theory: sched-implement-nice-support-across-physical-cpus-on-smp.patch
which leaves the following 3 likely candidates:
sched-change_prio_bias_only_if_queued.patch sched-smp-nice-bias-busy-queues-on-idle-rebalance.patch sched-task_noninteractive.patch
so if you could do a run with all 3 of the above unapplied, that would be a good starting point. (But any of the others might be it too, if they contain some sort of bug.)
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