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Date: Fri, 13 Oct 2023 08:50:42 +0200
From: Mike Galbraith <efault@....de>
To: Youssef Esmat <youssefesmat@...omium.org>,
LKML <linux-kernel@...r.kernel.org>
Cc: peterz@...radead.org, bsegall@...gle.com, mingo@...nel.org,
vincent.guittot@...aro.org, juri.lelli@...hat.com,
dietmar.eggemann@....com, rostedt@...dmis.org, mgorman@...e.de,
bristot@...hat.com, corbet@....net, qyousef@...alina.io,
chris.hyser@...cle.com, patrick.bellasi@...bug.net, pjt@...gle.com,
pavel@....cz, qperret@...gle.com, tim.c.chen@...ux.intel.com,
joshdon@...gle.com, timj@....org, kprateek.nayak@....com,
yu.c.chen@...el.com, joel@...lfernandes.org, tglx@...utronix.de,
wuyun.abel@...edance.com
Subject: Re: [PATCH] sched/eevdf: Toggle eligibility through sched_feat
On Thu, 2023-10-12 at 22:02 -0500, Youssef Esmat wrote:
> Interactive workloads see performance gains by disabling eligibility
> checks (EEVDF->EVDF). Disabling the checks reduces the number of
> context switches and delays less important work (higher deadlines/nice
> values) in favor of more important work (lower deadlines/nice values).
For some definitions of both interactive and benefit, both being a bit
too slippery to nail to the floor.
> That said, that can add large latencies for some work loads and as the
> default is eligibility on, but allowing it to be turned off when
> beneficial.
The only contra I would mention WRT the feature is that features having
no abi or thou shalt not regress protections makes them.. suboptimal
tuning knobs for userspace.
WRT patchlet, I tried same yesterday for grins (but spelled it "EVDF")
and fed it my favorite mixed load of youtube vs 8ms run 1ms sleep
massive_intr as a vaguely kbuild like competing "compute" component. It
didn't do anything lovely for the "interactive" bits, in fact did some
damage when letting the CPU do the rendering (something I have good but
irrelevant reasons to do at times;). With or without RUN_TO_PARITY,
EVDF skewed distribution toward "compute".
Some numbers, these from my old i7-4790 box:
Executive summary
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
stock
massive_intr:(9) |1827981.908 ms | 9163472 | avg: 0.040 ms | max: 13.026 ms | sum:366012.231 ms |
chrome:(8) | 33240.153 ms | 231301 | avg: 0.167 ms | max: 9.843 ms | sum:38606.462 ms |
TOTAL: |2307670.845 ms | 25693098 | | 19.050 ms | 1110835.993 ms |
evdf
massive_intr:(9) |1882920.417 ms | 575899 | avg: 0.536 ms | max: 31.997 ms | sum:308728.289 ms |
chrome:(12) | 33353.359 ms | 79764 | avg: 1.082 ms | max: 22.964 ms | sum:86266.324 ms |
TOTAL: |2289006.437 ms | 5105092 | | 31.997 ms | 2748046.342 ms |
evdf+no_run_to_parity
massive_intr:(9) |1853786.765 ms | 7939307 | avg: 0.043 ms | max: 14.061 ms | sum:340332.470 ms |
chrome:(8) | 32196.003 ms | 213646 | avg: 0.257 ms | max: 16.000 ms | sum:54881.879 ms |
TOTAL: |2329645.888 ms | 23157228 | | 16.475 ms | 1340188.243 ms |
nomodeset
stock
massive_intr:(9) |1618277.030 ms | 1762657 | avg: 0.339 ms | max: 15.149 ms | sum:597323.918 ms |
chrome:(17) | 44370.796 ms | 130519 | avg: 0.385 ms | max: 15.948 ms | sum:50216.546 ms |
TOTAL: |2366021.752 ms | 6242921 | | 20.655 ms | 1633058.780 ms |
evdf
massive_intr:(9) |1794662.731 ms | 533364 | avg: 0.760 ms | max: 32.242 ms | sum:405150.225 ms |
chrome:(16) | 32630.283 ms | 76394 | avg: 1.276 ms | max: 25.762 ms | sum:97491.996 ms |
TOTAL: |2338042.935 ms | 2756565 | | 32.242 ms | 3230287.162 ms |
evdf+no_run_to_parity
massive_intr:(9) |1697254.229 ms | 1584416 | avg: 0.321 ms | max: 19.086 ms | sum:508946.014 ms |
chrome:(16) | 39621.161 ms | 125058 | avg: 0.500 ms | max: 18.078 ms | sum:62565.629 ms |
TOTAL: |2376861.778 ms | 6325320 | | 24.005 ms | 1714658.200 ms |
Full perf summaries below (tl-dnr unless bored), end of filename describes setup.
perf sched lat -i perf.data.full.6.4.16-eevdf.stock --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(9) |1827981.908 ms | 9163472 | avg: 0.040 ms | max: 13.026 ms | sum:366012.231 ms |
ThreadPoolForeg:(19) | 171104.054 ms | 1929317 | avg: 0.101 ms | max: 19.050 ms | sum:195506.036 ms |
Compositor:19163 | 49069.470 ms | 239950 | avg: 0.140 ms | max: 12.894 ms | sum:33621.049 ms |
X:2146 | 46323.935 ms | 428673 | avg: 0.070 ms | max: 9.189 ms | sum:30078.222 ms |
VizCompositorTh:19249 | 41340.942 ms | 264742 | avg: 0.155 ms | max: 8.100 ms | sum:40944.049 ms |
chrome:(8) | 33240.153 ms | 231301 | avg: 0.167 ms | max: 9.843 ms | sum:38606.462 ms |
VideoFrameCompo:19257 | 21586.135 ms | 164881 | avg: 0.159 ms | max: 7.957 ms | sum:26136.556 ms |
kwin_x11:2580 | 17878.786 ms | 197481 | avg: 0.111 ms | max: 9.070 ms | sum:21872.000 ms |
kthreadd:(18) | 14951.452 ms | 2671846 | avg: 0.009 ms | max: 8.010 ms | sum:23349.382 ms |
Chrome_ChildIOT:(5) | 7253.392 ms | 206688 | avg: 0.117 ms | max: 7.288 ms | sum:24099.171 ms |
cyclictest:(9) | 5707.305 ms | 1058199 | avg: 0.171 ms | max: 13.533 ms | sum:181391.599 ms |
kworker/7:1+eve:18761 | 5201.144 ms | 957751 | avg: 0.008 ms | max: 8.909 ms | sum: 8113.339 ms |
perf:(2) | 5025.244 ms | 1865 | avg: 0.107 ms | max: 7.227 ms | sum: 199.488 ms |
kworker/0:0-eve:18017 | 4967.620 ms | 916589 | avg: 0.007 ms | max: 9.728 ms | sum: 6758.811 ms |
Media:19256 | 4964.743 ms | 83078 | avg: 0.177 ms | max: 9.663 ms | sum:14695.510 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |2307670.845 ms | 25693098 | | 19.050 ms | 1110835.993 ms |
----------------------------------------------------------------------------------------------------------
perf sched lat -i perf.data.full.6.4.16-eevdf.evdf --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(9) |1882920.417 ms | 575899 | avg: 0.536 ms | max: 31.997 ms | sum:308728.289 ms |
ThreadPoolForeg:(30) | 165069.668 ms | 470614 | avg: 0.639 ms | max: 29.031 ms | sum:300696.457 ms |
Compositor:(2) | 46785.446 ms | 60712 | avg: 0.858 ms | max: 31.196 ms | sum:52104.985 ms |
X:2146 | 46547.283 ms | 107721 | avg: 0.513 ms | max: 17.115 ms | sum:55250.852 ms |
VizCompositorTh:17683 | 40856.147 ms | 60474 | avg: 0.905 ms | max: 20.163 ms | sum:54729.452 ms |
chrome:(12) | 33353.359 ms | 79764 | avg: 1.082 ms | max: 22.964 ms | sum:86266.324 ms |
VideoFrameCompo:17692 | 17277.120 ms | 53230 | avg: 0.853 ms | max: 15.759 ms | sum:45393.835 ms |
kwin_x11:2580 | 13312.455 ms | 94547 | avg: 0.302 ms | max: 15.399 ms | sum:28526.434 ms |
Chrome_ChildIOT:(9) | 6318.114 ms | 94165 | avg: 0.902 ms | max: 16.436 ms | sum:84971.013 ms |
Media:17691 | 4880.461 ms | 45385 | avg: 0.843 ms | max: 13.567 ms | sum:38262.166 ms |
cyclictest:(9) | 3559.891 ms | 666850 | avg: 1.982 ms | max: 20.180 ms | sum:1321503.199 ms |
kthreadd:(13) | 3474.286 ms | 602855 | avg: 0.074 ms | max: 17.846 ms | sum:44813.758 ms |
alsa-sink-ALC88:2088 | 2583.063 ms | 41163 | avg: 0.005 ms | max: 0.515 ms | sum: 188.379 ms |
plasmashell:(2) | 2362.395 ms | 19626 | avg: 1.068 ms | max: 14.794 ms | sum:20955.374 ms |
threaded-ml:17712 | 1487.397 ms | 17958 | avg: 1.165 ms | max: 16.443 ms | sum:20926.765 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |2289006.437 ms | 5105092 | | 31.997 ms | 2748046.342 ms |
----------------------------------------------------------------------------------------------------------
perf sched lat -i perf.data.full.6.4.16-eevdf.evdf_no_run_to_parity --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(9) |1853786.765 ms | 7939307 | avg: 0.043 ms | max: 14.061 ms | sum:340332.470 ms |
ThreadPoolForeg:(20) | 167239.704 ms | 2256833 | avg: 0.113 ms | max: 16.475 ms | sum:254078.291 ms |
Compositor:18389 | 48419.605 ms | 200778 | avg: 0.230 ms | max: 12.690 ms | sum:46259.813 ms |
X:2146 | 45209.241 ms | 333263 | avg: 0.138 ms | max: 11.095 ms | sum:45850.493 ms |
VizCompositorTh:18464 | 40724.452 ms | 246254 | avg: 0.219 ms | max: 11.846 ms | sum:53828.807 ms |
chrome:(8) | 32196.003 ms | 213646 | avg: 0.257 ms | max: 16.000 ms | sum:54881.879 ms |
VideoFrameCompo:18474 | 19577.415 ms | 180778 | avg: 0.195 ms | max: 9.806 ms | sum:35266.517 ms |
kwin_x11:2580 | 16396.662 ms | 197846 | avg: 0.125 ms | max: 8.634 ms | sum:24647.504 ms |
kthreadd:(15) | 6986.487 ms | 1231177 | avg: 0.015 ms | max: 9.100 ms | sum:18079.114 ms |
Chrome_ChildIOT:(5) | 6502.116 ms | 190137 | avg: 0.268 ms | max: 10.421 ms | sum:50981.430 ms |
kworker/7:0-eve:18015 | 6253.830 ms | 1161609 | avg: 0.012 ms | max: 10.946 ms | sum:13745.498 ms |
cyclictest:(9) | 5898.072 ms | 1071596 | avg: 0.166 ms | max: 10.758 ms | sum:177833.361 ms |
kworker/5:2-eve:17027 | 5685.599 ms | 1055878 | avg: 0.012 ms | max: 7.236 ms | sum:12585.682 ms |
rastertospl:18767 | 5531.070 ms | 157164 | avg: 0.024 ms | max: 11.738 ms | sum: 3703.942 ms |
kworker/6:1-eve:17794 | 4993.173 ms | 926425 | avg: 0.013 ms | max: 7.288 ms | sum:11719.453 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |2329645.888 ms | 23157228 | | 16.475 ms | 1340188.243 ms |
----------------------------------------------------------------------------------------------------------
perf sched lat -i perf.data.full.6.4.16-eevdf.nms_stock --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(9) |1618277.030 ms | 1762657 | avg: 0.339 ms | max: 15.149 ms | sum:597323.918 ms |
ThreadPoolForeg:(30) | 206450.133 ms | 1290121 | avg: 0.189 ms | max: 20.655 ms | sum:243361.803 ms |
X:2144 | 129827.318 ms | 211518 | avg: 0.271 ms | max: 11.946 ms | sum:57368.468 ms |
VizCompositorTh:5013 | 60322.953 ms | 125632 | avg: 0.429 ms | max: 8.758 ms | sum:53893.618 ms |
Compositor:(2) | 60265.270 ms | 135041 | avg: 0.362 ms | max: 9.609 ms | sum:48833.756 ms |
chrome:(17) | 44370.796 ms | 130519 | avg: 0.385 ms | max: 15.948 ms | sum:50216.546 ms |
VideoFrameCompo:5021 | 24456.245 ms | 83088 | avg: 0.366 ms | max: 10.572 ms | sum:30424.287 ms |
llvmpipe-6:(3) | 23094.705 ms | 75617 | avg: 0.504 ms | max: 9.767 ms | sum:38106.696 ms |
llvmpipe-5:(3) | 22518.782 ms | 75909 | avg: 0.506 ms | max: 10.071 ms | sum:38447.875 ms |
llvmpipe-2:(3) | 22515.065 ms | 77387 | avg: 0.506 ms | max: 10.304 ms | sum:39181.863 ms |
llvmpipe-4:(3) | 22348.397 ms | 76206 | avg: 0.512 ms | max: 10.878 ms | sum:38981.961 ms |
llvmpipe-7:(3) | 21449.893 ms | 72673 | avg: 0.545 ms | max: 10.080 ms | sum:39585.490 ms |
llvmpipe-1:(3) | 21445.333 ms | 77249 | avg: 0.511 ms | max: 10.577 ms | sum:39436.002 ms |
llvmpipe-3:(3) | 21385.809 ms | 76409 | avg: 0.514 ms | max: 9.779 ms | sum:39295.360 ms |
llvmpipe-0:(3) | 18373.092 ms | 76699 | avg: 0.540 ms | max: 10.070 ms | sum:41411.515 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |2366021.752 ms | 6242921 | | 20.655 ms | 1633058.780 ms |
----------------------------------------------------------------------------------------------------------
perf sched lat -i perf.data.full.6.4.16-eevdf.nms_evdf --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(9) |1794662.731 ms | 533364 | avg: 0.760 ms | max: 32.242 ms | sum:405150.225 ms |
ThreadPoolForeg:(20) | 161341.055 ms | 445425 | avg: 0.729 ms | max: 25.981 ms | sum:324736.035 ms |
X:2144 | 91358.513 ms | 80781 | avg: 0.668 ms | max: 23.512 ms | sum:53947.202 ms |
VizCompositorTh:5628 | 53228.085 ms | 64676 | avg: 1.041 ms | max: 22.603 ms | sum:67298.785 ms |
Compositor:5535 | 53070.756 ms | 64927 | avg: 0.978 ms | max: 21.131 ms | sum:63507.765 ms |
chrome:(16) | 32630.283 ms | 76394 | avg: 1.276 ms | max: 25.762 ms | sum:97491.996 ms |
VideoFrameCompo:5636 | 18292.351 ms | 51680 | avg: 0.939 ms | max: 26.293 ms | sum:48545.469 ms |
llvmpipe-2:(3) | 12897.634 ms | 36193 | avg: 1.327 ms | max: 19.412 ms | sum:48042.017 ms |
llvmpipe-5:(3) | 12275.682 ms | 36512 | avg: 1.329 ms | max: 13.125 ms | sum:48509.590 ms |
llvmpipe-4:(3) | 12196.303 ms | 36457 | avg: 1.334 ms | max: 21.460 ms | sum:48620.630 ms |
llvmpipe-7:(3) | 12119.861 ms | 36633 | avg: 1.324 ms | max: 17.920 ms | sum:48514.587 ms |
llvmpipe-0:(3) | 12106.474 ms | 37216 | avg: 1.256 ms | max: 13.919 ms | sum:46752.353 ms |
llvmpipe-3:(3) | 11788.836 ms | 36487 | avg: 1.344 ms | max: 13.044 ms | sum:49047.686 ms |
llvmpipe-1:(3) | 11630.206 ms | 36582 | avg: 1.329 ms | max: 14.691 ms | sum:48600.821 ms |
llvmpipe-6:(3) | 11523.446 ms | 36457 | avg: 1.353 ms | max: 16.520 ms | sum:49325.031 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |2338042.935 ms | 2756565 | | 32.242 ms | 3230287.162 ms |
----------------------------------------------------------------------------------------------------------
perf sched lat -i perf.data.full.6.4.16-eevdf.nms_evdf_no_run_to_parity --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(9) |1697254.229 ms | 1584416 | avg: 0.321 ms | max: 19.086 ms | sum:508946.014 ms |
ThreadPoolForeg:(21) | 185078.035 ms | 1677435 | avg: 0.171 ms | max: 24.005 ms | sum:286473.362 ms |
X:2144 | 119097.420 ms | 180142 | avg: 0.296 ms | max: 12.004 ms | sum:53361.641 ms |
Compositor:6108 | 59219.138 ms | 124003 | avg: 0.470 ms | max: 10.081 ms | sum:58341.411 ms |
VizCompositorTh:6199 | 58309.342 ms | 115937 | avg: 0.561 ms | max: 11.647 ms | sum:64992.383 ms |
chrome:(16) | 39621.161 ms | 125058 | avg: 0.500 ms | max: 18.078 ms | sum:62565.629 ms |
VideoFrameCompo:6208 | 22411.289 ms | 88274 | avg: 0.439 ms | max: 15.439 ms | sum:38730.863 ms |
llvmpipe-6:(3) | 20137.882 ms | 70402 | avg: 0.572 ms | max: 10.372 ms | sum:40297.152 ms |
llvmpipe-7:(3) | 19835.717 ms | 69843 | avg: 0.575 ms | max: 9.998 ms | sum:40176.008 ms |
llvmpipe-5:(3) | 19401.835 ms | 69728 | avg: 0.589 ms | max: 8.997 ms | sum:41069.559 ms |
llvmpipe-4:(3) | 18977.364 ms | 69932 | avg: 0.591 ms | max: 13.462 ms | sum:41361.608 ms |
llvmpipe-3:(3) | 18459.713 ms | 69809 | avg: 0.599 ms | max: 10.459 ms | sum:41800.434 ms |
llvmpipe-2:(3) | 18255.747 ms | 70021 | avg: 0.604 ms | max: 11.308 ms | sum:42259.431 ms |
llvmpipe-1:(3) | 17637.013 ms | 69658 | avg: 0.613 ms | max: 10.963 ms | sum:42710.066 ms |
llvmpipe-0:(3) | 15466.278 ms | 68809 | avg: 0.648 ms | max: 9.798 ms | sum:44575.145 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |2376861.778 ms | 6325320 | | 24.005 ms | 1714658.200 ms |
----------------------------------------------------------------------------------------------------------
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