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2026-04-24 - 23:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 20 highest latencies:
System rackcslot7s.osadl.org (updated Fri Apr 24, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
410023522700,6sleep00-21swapper/007:05:210
409999522420,6sleep1251rcuc/107:05:181
41761822970,2sleep20-21swapper/210:40:172
409959729743,44sleep30-21swapper/307:05:133
409995727444,21sleep20-21swapper/207:05:152
41211892610,3sleep0161rcuc/008:05:010
41329822530,3sleep10-21swapper/108:35:211
41017692440,4sleep30-21swapper/307:10:143
41123132330,1chrt4112316-21turbostat.cron07:39:592
4101176993026,3cyclictest1228-21cstates11:35:120
175252270,3chrt3056-21PK-Backend12:20:153
4101183992420,3cyclictest34-21ksoftirqd/209:58:422
410117899240,22cyclictest1895009-21snapd10:44:151
139099240,4rtkit-daemon1389-21rtkit-daemon10:48:531
139099240,3rtkit-daemon1389-21rtkit-daemon08:30:080
41599562230,3chrt0-21swapper/309:55:103
410118699238,13cyclictest21159-21latency12:30:153
410118399231,3cyclictest141rcu_preempt08:56:162
4101178992316,5cyclictest436-20systemd-journal11:45:241
410117899230,2cyclictest4123913-21strings08:10:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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