Messages in this thread | | | Subject | Re: [rfc][patch] select_idle_sibling() inducing bouncing on westmere | From | Mike Galbraith <> | Date | Wed, 06 Jun 2012 12:38:59 +0200 |
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btw, numbers are intended to invoke: "Gee, wonder what if anything this does to/for my favorite load" ;-)
On Wed, 2012-06-06 at 12:17 +0200, Mike Galbraith wrote: > On Thu, 2012-05-24 at 15:17 +0200, Peter Zijlstra wrote: > > > Did you do you numbers with the distro NR_CPUS=4096 bloat? > > 4 socket Westmere-EX 40 core box.. ouch^ouch. > > 3.0 has none of the below, 3.0x all, 3.0xx all but the ones commented > out. Most of the deltas are sibling avoidance, though throttle-nohz > plays a role in 3.0 vs 3.0x, as does knob tweakery, though very very > small for these particular tests. The rest are ~meaningless. > > sched-use-rt-nr_cpus_allowed-to-recover-select_task_rq-cycles.patch > sched-set-skip_clock_update-when-yielding.patch > sched-throttle-nohz.patch > sched-Wrap-scheduler-p--cpus_allowed-access.patch > sched-Avoid-SMT-siblings-in-select_idle_sibling-if-possible.patch > sched-Clean-up-domain-traversal-in-select_idle_sibling.patch > sched-Remove-rcu_read_lock-unlock-from-select_idle_sibling.patch > sched-Fix-the-sched-group-node-allocation-for-SD_OVERLAP-domains.patch > sched-domain-flags-proc-handler.patch > # sched-tweak-select_idle_sibling.patch > sched-tweak-knobs.patch > # sched-ratelimit-affine-wakeup-migrations.patch > > thench 1 2 4 8 16 32 64 128 > 3.0 225 451 911 1573 2723 3501 11189 13951 > 3.0x 299 603 1211 2418 4697 6847 11606 14557 > vs 3.0 1.328 1.337 1.329 1.537 1.724 1.955 1.037 1.043 > > 3.0xx 30 41 118 645 3769 6214 12233 14312 > vs 3.0x 0.100 0.067 0.097 0.266 0.802 0.907 1.054 0.983 > hmmm > aim7 ~low load.. not saturating. > > Benchmark Version Machine Run Date > AIM Multiuser Benchmark - Suite VII "1.1" 3.0x Jun 6 09:29:20 2012 > > Tasks Jobs/Min JTI Real CPU Jobs/sec/task > 64 26223.1 98 14.8 293.3 6.8289 > > Benchmark Version Machine Run Date > AIM Multiuser Benchmark - Suite VII "1.1" 3.0xx Jun 6 11:12:21 2012 > > Tasks Jobs/Min JTI Real CPU Jobs/sec/task > 64 18845.5 82 20.6 254.8 4.9077 vs 3.0x 0.718 > >
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