Messages in this thread | | | Date | Mon, 28 Jan 2013 12:29:22 +0100 | From | Borislav Petkov <> | Subject | Re: [patch v4 0/18] sched: simplified fork, release load avg and power awareness scheduling |
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On Mon, Jan 28, 2013 at 11:44:44AM +0100, Mike Galbraith wrote: > On Mon, 2013-01-28 at 10:55 +0100, Borislav Petkov wrote: > > On Mon, Jan 28, 2013 at 06:17:46AM +0100, Mike Galbraith wrote: > > > Zzzt. Wish I could turn turbo thingy off. > > > > Try setting /sys/devices/system/cpu/cpufreq/boost to 0. > > How convenient (test) works too. > > So much for turbo boost theory. Nothing changed until I turned load > balancing off at NODE. High end went to hell (gee), but low end... > > Benchmark Version Machine Run Date > AIM Multiuser Benchmark - Suite VII "1.1" performance-no-node-load_balance Jan 28 11:20:12 2013 > > Tasks Jobs/Min JTI Real CPU Jobs/sec/task > 1 436.3 100 13.9 3.9 7.2714 > 5 2637.1 99 11.5 7.3 8.7903 > 10 5415.5 99 11.2 11.3 9.0259 > 20 10603.7 99 11.4 24.8 8.8364 > 40 20066.2 99 12.1 40.5 8.3609 > 80 35079.6 99 13.8 75.5 7.3082 > 160 55884.7 98 17.3 145.6 5.8213 > 320 79345.3 98 24.4 287.4 4.1326
If you're talking about those results from earlier:
Benchmark Version Machine Run Date AIM Multiuser Benchmark - Suite VII "1.1" performance Jan 28 08:09:20 2013
Tasks Jobs/Min JTI Real CPU Jobs/sec/task 1 438.8 100 13.8 3.8 7.3135 5 2634.8 99 11.5 7.2 8.7826 10 5396.3 99 11.2 11.4 8.9938 20 10725.7 99 11.3 24.0 8.9381 40 20183.2 99 12.0 38.5 8.4097 80 35620.9 99 13.6 71.4 7.4210 160 57203.5 98 16.9 137.8 5.9587 320 81995.8 98 23.7 271.3 4.2706
then the above no_node-load_balance thing suffers a small-ish dip at 320 tasks, yeah.
And AFAICR, the effect of disabling boosting will be visible in the small count tasks cases anyway because if you saturate the cores with tasks, the boosting algorithms tend to get the box out of boosting for the simple reason that the power/perf headroom simply disappears due to the SOC being busy.
> 640 100294.8 98 38.7 570.9 2.6118 > 1280 115998.2 97 66.9 1132.8 1.5104 > 2560 125820.0 97 123.3 2256.6 0.8191
I dunno about those. maybe this is expected with so many tasks or do we want to optimize that case further?
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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