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2025-07-19 - 10:45

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 Sat Jul 19, 2025 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
407899250,24cyclictest0-21swapper/223:36:172
4081992420,3cyclictest1437-21awk23:29:593
4078992420,3cyclictest3281-21ls20:14:592
407899240,23cyclictest0-21swapper/221:01:162
4072992423,0cyclictest0-21swapper/023:01:170
4072992422,1cyclictest0-21swapper/022:10:000
4078992323,0cyclictest0-21swapper/221:21:162
4078992323,0cyclictest0-21swapper/220:56:192
407899230,22cyclictest9835-21sh22:39:592
407899230,22cyclictest21566-21apt-get00:11:182
407399230,2cyclictest22625-21perf22:00:001
407399230,22cyclictest0-21swapper/121:36:161
4072992321,1cyclictest6433-21idleruntime-cro19:15:000
407299230,22cyclictest16324-21perf00:00:000
407299230,22cyclictest1427-21sh23:30:000
407299230,22cyclictest13019-21perf21:40:000
407299230,22cyclictest0-21swapper/019:46:160
4081992222,0cyclictest0-21swapper/321:49:593
4081992221,1cyclictest0-21swapper/323:06:163
408199220,21cyclictest3184-21cron00:40:003
408199220,21cyclictest28774-21apt-get00:26:203
408199220,21cyclictest16121-21apt-get20:41:143
408199220,21cyclictest0-21swapper/322:41:173
408199220,1cyclictest17071-21munin-run22:55:003
408199220,1cyclictest10560-21turbostat.cron20:30:003
4078992221,1cyclictest23959-21apt-get00:16:172
4078992220,1cyclictest0-21swapper/222:51:182
4078992219,2cyclictest22926-21cron20:55:012
407899220,21cyclictest9269-21apt-get19:21:162
407899220,21cyclictest31260-21apt-get20:06:142
407899220,21cyclictest28868-21apt-get20:01:172
407899220,21cyclictest16778-21apt-get00:01:172
407899220,21cyclictest0-21swapper/223:06:162
407899220,21cyclictest0-21swapper/223:01:172
407899220,1cyclictest11875-21apt-get23:51:162
407399220,21cyclictest313-21systemd-journal19:35:001
407399220,21cyclictest1135-21apt-get00:36:171
407399220,21cyclictest0-21swapper/122:36:151
407399220,21cyclictest0-21swapper/121:11:191
407399220,1cyclictest0-21swapper/119:20:001
4072992222,0cyclictest9269-21apt-get19:21:160
4072992220,1cyclictest0-21swapper/020:25:000
4072992220,1cyclictest0-21swapper/000:10:000
407299220,21cyclictest8522-21apt-get20:26:180
407299220,21cyclictest17415-21apt-get22:56:180
407299220,21cyclictest15020-21apt-get22:51:180
407299220,21cyclictest0-21swapper/023:51:160
407299220,21cyclictest0-21swapper/023:11:140
407299220,21cyclictest0-21swapper/023:06:160
407299220,21cyclictest0-21swapper/022:25:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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