Messages in this thread | | | Subject | Re: [RFC/RFT][PATCH v2 0/6] sched/cpuidle: Idle loop rework | From | Mike Galbraith <> | Date | Thu, 08 Mar 2018 11:31:39 +0100 |
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On Tue, 2018-03-06 at 09:57 +0100, Rafael J. Wysocki wrote: > Hi All,
Greetings,
> Thanks a lot for the discussion so far! > > Here's a new version of the series addressing some comments from the > discussion and (most importantly) replacing patches 4 and 5 with another > (simpler) patch.
Oddity: these patches seemingly manage to cost a bit of power when lightly loaded. (but didn't cut cross core nohz cost much.. darn)
i4790 booted nopti nospectre_v2
30 sec tbench 4.16.0.g1b88acc-master (virgin) Throughput 559.279 MB/sec 1 clients 1 procs max_latency=0.046 ms Throughput 997.119 MB/sec 2 clients 2 procs max_latency=0.246 ms Throughput 1693.04 MB/sec 4 clients 4 procs max_latency=4.309 ms Throughput 3597.2 MB/sec 8 clients 8 procs max_latency=6.760 ms Throughput 3474.55 MB/sec 16 clients 16 procs max_latency=6.743 ms
4.16.0.g1b88acc-master (+v2) Throughput 588.929 MB/sec 1 clients 1 procs max_latency=0.291 ms Throughput 1080.93 MB/sec 2 clients 2 procs max_latency=0.639 ms Throughput 1826.3 MB/sec 4 clients 4 procs max_latency=0.647 ms Throughput 3561.01 MB/sec 8 clients 8 procs max_latency=1.279 ms Throughput 3382.98 MB/sec 16 clients 16 procs max_latency=4.817 ms
4.16.0.g1b88acc-master (+local nohz mitigation etc for reference [1]) Throughput 722.559 MB/sec 1 clients 1 procs max_latency=0.087 ms Throughput 1208.59 MB/sec 2 clients 2 procs max_latency=0.289 ms Throughput 2071.94 MB/sec 4 clients 4 procs max_latency=0.654 ms Throughput 3784.91 MB/sec 8 clients 8 procs max_latency=0.974 ms Throughput 3644.4 MB/sec 16 clients 16 procs max_latency=5.620 ms
turbostat -q -- firefox /root/tmp/video/BigBuckBunny-DivXPlusHD.mkv & sleep 300;killall firefox
PkgWatt 1 2 3 4.16.0.g1b88acc-master 6.95 7.03 6.91 (virgin) 4.16.0.g1b88acc-master 7.20 7.25 7.26 (+v2) 4.16.0.g1b88acc-master 6.90 7.06 6.95 (+local)
Why would v2 charge the light firefox load a small but consistent fee?
-Mike
1. see low end, that's largely due to nohz throttling
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