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2025-12-05 - 13:47

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 Fri Dec 05, 2025 00:44:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28999992624,1cyclictest12654-21awk20:50:001
2900099250,24cyclictest10784-21apt-get20:48:162
28999992420,3cyclictest19344-21apt-get23:18:181
28994992422,1cyclictest141rcuc/023:10:000
2899499240,23cyclictest0-21swapper/020:35:000
2900199230,2cyclictest28249-21apt00:39:593
29000992322,1cyclictest27664-21apt-get21:23:192
28999992321,1cyclictest616-21dump-pmu-power20:25:001
2899999230,22cyclictest0-21swapper/122:20:001
28994992321,1cyclictest621-21perf20:25:000
2899499230,22cyclictest583-21avahi-daemon23:05:000
29001992221,1cyclictest9339-21apt-get22:58:183
29001992220,1cyclictest13406-21munin-plugin-st19:45:003
2900199220,21cyclictest25846-21dump-pmu-power00:35:003
2900199220,21cyclictest16654-21apt-get23:10:023
2900199220,21cyclictest15578-21apt-get20:58:163
2900199220,21cyclictest0-21swapper/323:33:163
2900199220,1cyclictest0-21swapper/322:38:183
29000992220,1cyclictest31624-21turbostat22:35:002
29000992220,1cyclictest31624-21turbostat22:35:002
2900099220,21cyclictest4293-21apt-get19:28:172
2900099220,21cyclictest28219-21cron20:15:002
2900099220,21cyclictest0-21swapper/222:48:152
2900099220,1cyclictest6086-21cron23:55:002
2899999220,21cyclictest5970-21apt-get20:38:171
2899999220,21cyclictest24553-21apt-get23:28:191
2899999220,21cyclictest0-21swapper/120:58:161
2899999220,1cyclictest313-21systemd-journal19:40:001
2899999220,1cyclictest29547-21latency_hist21:25:001
2899999220,1cyclictest23909-21apt-get20:08:161
2899999220,0cyclictest0-21swapper/122:48:141
28994992222,0cyclictest0-21swapper/023:10:010
28994992220,1cyclictest9119-21apt-get00:03:180
28994992220,1cyclictest27119-21idleruntime-cro21:20:000
28994992220,1cyclictest1286-21sh23:45:000
28994992219,2cyclictest24368-21idleruntime-cro22:20:000
2899499220,21cyclictest0-21swapper/023:35:010
2899499220,21cyclictest0-21swapper/022:03:210
2899499220,1cyclictest3061-21awk20:30:000
2899499220,1cyclictest0-21swapper/021:55:020
29001992120,1cyclictest31882-21apt-get19:18:143
29001992119,1cyclictest11940-21apt-get21:55:003
29001992119,1cyclictest0-21swapper/321:05:003
2900199210,20cyclictest20577-21sh20:00:003
2900199210,20cyclictest0-21swapper/323:38:193
2900199210,20cyclictest0-21swapper/321:50:003
2900199210,20cyclictest0-21swapper/321:30:013
2900199210,20cyclictest0-21swapper/320:43:183
2900199210,1cyclictest3779-21grep19:25:003
2900199210,1cyclictest18667-21munin-run00:20:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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