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2026-01-12 - 12:10

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot5s.osadl.org (updated Mon Jan 12, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
15303992623,2cyclictest606-21dbus-daemon20:55:001
15303992523,1cyclictest19323-21latency_hist20:25:011
1531199240,23cyclictest19016-21latency_hist22:35:013
1531199240,23cyclictest0-21swapper/322:11:473
1530399240,0cyclictest0-21swapper/121:21:471
1531199230,2cyclictest23915-21apt-get23:51:463
1531199230,2cyclictest0-21swapper/322:56:453
1531199230,22cyclictest21706-21apt-get20:30:013
1531199230,22cyclictest0-21swapper/321:41:453
15303992321,1cyclictest3827-21munin-run23:10:001
15303992320,2cyclictest606-21dbus-daemon19:45:011
1530399230,2cyclictest28336-21sh00:00:001
1529899230,22cyclictest21773-21sh21:35:000
1529899230,22cyclictest0-21swapper/021:16:460
15311992220,1cyclictest4163-21apt-get22:05:023
15311992220,1cyclictest2116-21munin-plugin-st20:55:003
15311992220,1cyclictest0-21swapper/321:01:473
1531199220,21cyclictest25657-21apt-get19:31:453
1531199220,21cyclictest2494-21apt-get20:56:453
1531199220,21cyclictest12147-21latency_hist21:15:013
1531199220,21cyclictest1184-21apt-get00:11:473
1531199220,21cyclictest0-21swapper/323:21:473
1531199220,21cyclictest0-21swapper/321:06:473
15306992222,0cyclictest0-21swapper/221:36:442
15306992220,1cyclictest13195-21apt-get00:36:432
1530699220,21cyclictest313-21systemd-journal20:50:002
1530699220,21cyclictest25906-21apt23:55:002
1530699220,21cyclictest19407-21apt-get22:36:472
1530699220,21cyclictest13491-21cron23:30:012
1530699220,21cyclictest0-21swapper/200:00:002
1530699220,1cyclictest7322-21munin-run21:05:012
1530699220,1cyclictest2088-21awk20:55:002
1530699220,1cyclictest20471-21apt-get19:21:462
15303992220,1cyclictest19373-21perf21:30:001
15303992220,1cyclictest0-21swapper/121:50:011
15303992219,2cyclictest14496-21dump-pmu-power20:15:011
1530399220,21cyclictest26965-21awk21:45:011
1530399220,21cyclictest25657-21apt-get19:31:451
1530399220,21cyclictest21521-21apt-get23:46:481
1530399220,21cyclictest0-21swapper/121:36:441
1530399220,21cyclictest0-21swapper/120:06:451
1530399220,1cyclictest14608-21apt-get22:26:461
1530399220,0cyclictest0-21swapper/119:16:461
15298992220,1cyclictest8716-21perf23:20:000
1529899220,21cyclictest9420-21awk22:15:000
1529899220,21cyclictest1808-21apt-get23:06:470
1529899220,21cyclictest0-21swapper/021:06:470
15311992121,0cyclictest0-21swapper/319:46:463
15311992119,1cyclictest17634-21cron19:15:003
15311992119,1cyclictest0-21swapper/319:25:013
1531199210,21cyclictest0-21swapper/321:16:463
1531199210,21cyclictest0-21swapper/319:36:463
1531199210,20cyclictest0-21swapper/323:46:473
1531199210,20cyclictest0-21swapper/321:51:463
1531199210,20cyclictest0-21swapper/319:16:463
1531199210,20cyclictest0-21swapper/300:16:483
1531199210,0cyclictest0-21swapper/323:01:473
15306992121,0cyclictest0-21swapper/223:31:472
15306992120,1cyclictest12217-21apt-get22:21:492
15306992120,0cyclictest14897-21apt-get20:16:462
1530699210,21cyclictest0-21swapper/223:46:482
1530699210,20cyclictest0-21swapper/222:26:462
1530699210,0cyclictest0-21swapper/221:16:462
1530699210,0cyclictest0-21swapper/220:31:462
15303992121,0cyclictest31212-21apt-get00:06:471
15303992121,0cyclictest0-21swapper/122:31:481
15303992120,1cyclictest7661-21apt-get20:01:451
15303992120,1cyclictest30058-21latency_hist19:40:011
15303992120,1cyclictest10151-21apt-get21:11:461
15303992120,1cyclictest0-21swapper/120:36:461
15303992120,0cyclictest13911-21apt-get23:31:471
1530399210,20cyclictest12544-21apt-get21:16:461
1530399210,20cyclictest0-21swapper/119:56:481
1530399210,0cyclictest9797-21apt-get22:16:481
1530399210,0cyclictest0-21swapper/123:16:471
1530399210,0cyclictest0-21swapper/120:56:451
1530399210,0cyclictest0-21swapper/119:51:471
1530399210,0cyclictest0-21swapper/119:21:461
15298992121,0cyclictest0-21swapper/023:36:460
15298992121,0cyclictest0-21swapper/023:11:480
15298992121,0cyclictest0-21swapper/022:51:470
15298992121,0cyclictest0-21swapper/000:11:470
15298992119,1cyclictest21438-21munin-run22:40:010
1529899210,21cyclictest0-21swapper/023:31:470
1529899210,21cyclictest0-21swapper/022:16:480
1529899210,20cyclictest0-21swapper/023:26:470
1529899210,1cyclictest0-21swapper/023:41:470
1529899210,0cyclictest0-21swapper/022:06:460
1529899210,0cyclictest0-21swapper/019:41:460
1529899210,0cyclictest0-21swapper/019:36:460
15311992020,0cyclictest0-21swapper/321:56:473
15311992020,0cyclictest0-21swapper/321:21:473
15311992020,0cyclictest0-21swapper/319:26:443
15311992020,0cyclictest0-21swapper/319:26:443
15311992020,0cyclictest0-21swapper/300:06:473
15311992018,1cyclictest19318-21awk20:25:013
15311992018,1cyclictest0-21swapper/323:45:013
1531199200,20cyclictest0-21swapper/320:30:023
1531199200,0cyclictest8414-21apt-get00:26:483
1531199200,0cyclictest0-21swapper/322:51:473
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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