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2025-05-02 - 12:38

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 May 02, 2025 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2056499250,24cyclictest313-21systemd-journal23:50:002
2056499250,24cyclictest313-21systemd-journal23:50:002
2056499240,23cyclictest5770-21idleruntime-cro21:59:592
2055799240,1cyclictest313-21systemd-journal21:05:000
20561992320,2cyclictest25390-21sendmail22:40:001
2056199230,2cyclictest30134-21cut19:30:001
2056199230,22cyclictest23799-21idleruntime-cro21:29:591
2056199230,22cyclictest18723-21perf00:40:001
20557992320,2cyclictest2493-21cron19:40:000
2055799230,22cyclictest4133-21basename20:50:010
2055799230,21cyclictest0-21swapper/000:15:000
2056799221,1cyclictest10205-21munin-plugin-st23:15:013
2056799220,21cyclictest794-21apt-get22:59:363
2056799220,21cyclictest31605-21apt-get21:49:383
2056799220,21cyclictest0-21swapper/319:24:363
2056799220,1cyclictest7146-21apt-get20:59:393
20564992222,0cyclictest10318-21apt-get19:59:392
20564992220,1cyclictest8918-21ls21:00:002
20564992220,1cyclictest23029-21munin-run22:35:002
20564992220,1cyclictest1932-21latency_hist00:05:012
20564992219,2cyclictest9095-21dump-pmu-power00:20:002
2056499220,21cyclictest3133-21apt-get19:44:362
2056499220,21cyclictest27664-21chrt23:54:362
2056499220,21cyclictest0-21swapper/221:15:002
2056499220,21cyclictest0-21swapper/221:04:382
2056499220,1cyclictest0-21swapper/200:40:002
20561992222,0cyclictest0-21swapper/123:54:361
20561992221,1cyclictest0-21swapper/121:14:401
2056199220,21cyclictest0-21swapper/123:59:371
2056199220,1cyclictest16899-21perf20:10:001
2056199220,1cyclictest0-21swapper/122:59:361
20557992222,0cyclictest0-21swapper/019:44:340
20557992220,1cyclictest26183-21grep21:35:010
20557992220,1cyclictest21137-21apt-get19:14:340
2055799220,21cyclictest0-21swapper/023:59:380
2055799220,21cyclictest0-21swapper/023:10:020
2055799220,21cyclictest0-21swapper/021:59:370
2055799220,21cyclictest0-21swapper/020:39:370
2055799220,21cyclictest0-21swapper/020:19:380
2055799220,21cyclictest0-21swapper/019:54:420
2055799220,1cyclictest0-21swapper/022:05:000
20567992121,0cyclictest22005-21apt-get21:29:353
20567992121,0cyclictest0-21swapper/323:54:363
20567992121,0cyclictest0-21swapper/322:49:353
20567992120,1cyclictest32371-21apt-get20:44:353
20567992120,1cyclictest14745-21apt-get21:14:403
20567992119,1cyclictest313-21systemd-journal22:40:003
2056799211,1cyclictest8186-21latency_hist22:04:593
2056799210,20cyclictest689-21apt-get19:39:353
2056799210,20cyclictest3227-21apt-get23:04:373
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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