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2026-01-07 - 12:46

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 50 highest latencies:
System rackeslot5s.osadl.org (updated Wed Jan 07, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1668992825,2cyclictest13-21ksoftirqd/000:00:010
1668992621,4cyclictest22519-21awk21:00:010
1682992422,1cyclictest5679-21cron20:25:003
167799240,23cyclictest13083-21munin-run00:00:012
1673992422,1cyclictest8272-21munin-plugin-st23:50:011
1668992422,1cyclictest0-21swapper/000:11:210
1668992421,2cyclictest13262-21apt20:41:220
166899240,23cyclictest9022-21munin-run22:45:000
1682992323,0cyclictest0-21swapper/321:05:023
168299231,21cyclictest990-21apt-get23:36:203
168299230,22cyclictest3312-21basename20:20:003
168299230,22cyclictest0-21swapper/322:26:203
168299230,1cyclictest6051-21apt-get20:26:203
167799230,22cyclictest0-21swapper/222:41:232
1673992321,1cyclictest13213-21apachectl00:00:011
167399231,1cyclictest27296-21apt-get22:16:221
167399230,2cyclictest21364-21runrttasks23:11:221
167399230,22cyclictest24545-21perf22:10:001
167399230,22cyclictest0-21swapper/121:36:221
166899230,22cyclictest13-21ksoftirqd/021:31:190
166899230,22cyclictest13-21ksoftirqd/021:31:190
1682992222,0cyclictest0-21swapper/323:56:223
1682992220,1cyclictest4018-21idleruntime-cro19:15:013
1682992220,1cyclictest27938-21apt00:30:003
1682992219,2cyclictest25148-21cron00:25:003
168299220,21cyclictest25666-21lockfile-remove20:00:013
168299220,21cyclictest10844-21apt-get20:36:203
168299220,21cyclictest0-21swapper/300:05:013
1677992220,1cyclictest0-21swapper/220:11:232
1677992220,1cyclictest0-21swapper/200:25:022
1677992219,2cyclictest25791-21cron23:20:012
167799220,21cyclictest29411-21ls22:20:012
167799220,21cyclictest11596-21apt-get19:31:202
167799220,21cyclictest0-21swapper/220:51:212
1673992220,1cyclictest14962-21munin-run21:50:011
1673992220,1cyclictest0-21swapper/120:46:221
1673992219,2cyclictest16199-21dump-pmu-power23:00:001
1673992219,2cyclictest12913-21idleruntime-cro20:40:011
1673992218,3cyclictest32163-21apt-get22:26:201
167399220,21cyclictest29768-21apt-get22:21:201
167399220,21cyclictest25174-21munin-run00:25:001
167399220,21cyclictest20447-21apt-get20:56:221
167399220,21cyclictest0-21swapper/123:16:221
167399220,21cyclictest0-21swapper/122:11:221
167399220,21cyclictest0-21swapper/122:01:211
167399220,21cyclictest0-21swapper/121:56:221
167399220,21cyclictest0-21swapper/121:51:211
1668992220,1cyclictest9370-21apt-get22:46:220
1668992219,1cyclictest313-21systemd-journal22:15:010
166899220,2cyclictest17937-21grep00:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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