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Date: Tue, 25 Aug 2020 17:52:38 +0200 From: Vincent Guittot <vincent.guittot@...aro.org> To: Mel Gorman <mgorman@...e.de> Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] sched/numa: use runnable_avg to classify node On Tue, 25 Aug 2020 at 15:58, Mel Gorman <mgorman@...e.de> wrote: > > On Tue, Aug 25, 2020 at 02:18:18PM +0200, Vincent Guittot wrote: > > Use runnable_avg to classify numa node state similarly to what is done for > > normal load balancer. This helps to ensure that numa and normal balancers > > use the same view of the state of the system. > > > > - large arm64system: 2 nodes / 224 CPUs > > hackbench -l (256000/#grp) -g #grp > > > > grp tip/sched/core +patchset improvement > > 1 14,008(+/- 4,99 %) 13,800(+/- 3.88 %) 1,48 % > > 4 4,340(+/- 5.35 %) 4.283(+/- 4.85 %) 1,33 % > > 16 3,357(+/- 0.55 %) 3.359(+/- 0.54 %) -0,06 % > > 32 3,050(+/- 0.94 %) 3.039(+/- 1,06 %) 0,38 % > > 64 2.968(+/- 1,85 %) 3.006(+/- 2.92 %) -1.27 % > > 128 3,290(+/-12.61 %) 3,108(+/- 5.97 %) 5.51 % > > 256 3.235(+/- 3.95 %) 3,188(+/- 2.83 %) 1.45 % > > > > Intuitively the patch makes sense but I'm not a fan of using hackbench > for evaluating NUMA balancing. The tasks are too short-lived and it's > not sensitive enough to data placement because of the small footprint > and because hackbench tends to saturate a machine. > > As predicting NUMA balancing behaviour in your head can be difficult, I've > queued up a battery of tests on a few different NUMA machines and will see > what falls out. It'll take a few days as some of the tests are long-lived. Thanks for testing Mel > > Baseline will be 5.9-rc2 as I haven't looked at the topology rework in > tip/sched/core and this patch should not be related to it. looks fine to me > > -- > Mel Gorman > SUSE Labs
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