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2025-07-01 - 08:08

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 Tue Jul 01, 2025 00:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1588299251,23cyclictest27896-21tr20:40:000
1588799240,23cyclictest12852-21basename00:40:003
15884992422,1cyclictest593-21dbus-daemon22:19:591
1588499240,23cyclictest24749-21tr21:40:001
1588299240,1cyclictest15759-21apt-get21:24:460
1588299240,1cyclictest13-21ksoftirqd/022:44:470
1588799230,22cyclictest0-21swapper/319:30:013
15886992321,1cyclictest12802-21sh00:40:002
15886992321,1cyclictest0-21swapper/221:40:002
15886992320,3cyclictest0-21swapper/219:34:412
15886992320,2cyclictest313-21systemd-journal22:19:592
1588699230,22cyclictest25479-21basename20:35:002
15884992320,2cyclictest15867-21idleruntime-cro20:15:001
1588499230,22cyclictest593-21dbus-daemon23:20:001
1588499230,22cyclictest24048-21apt-get19:29:441
1588299230,2cyclictest21012-21perf19:20:000
1588299230,22cyclictest9916-21awk21:10:000
15887992222,0cyclictest0-21swapper/323:09:453
15887992221,1cyclictest27725-21basename00:00:003
15887992221,1cyclictest0-21swapper/322:44:473
1588799220,21cyclictest0-21swapper/322:59:473
1588799220,21cyclictest0-21swapper/321:54:473
1588799220,0cyclictest0-21swapper/300:14:453
15886992220,1cyclictest14036-21perf22:25:002
15886992220,1cyclictest0-21swapper/220:24:422
1588699220,21cyclictest2566-21apt-get22:04:502
1588699220,21cyclictest19463-21apt-get22:39:472
1588699220,21cyclictest0-21swapper/220:04:432
1588699220,1cyclictest7540-21munin-plugin-st21:05:002
1588699220,1cyclictest0-21swapper/223:14:462
15884992221,1cyclictest25367-21apt-get21:44:441
15884992220,1cyclictest16441-21apt-get19:10:011
15884992220,1cyclictest14729-21apt-get21:20:021
15884992219,2cyclictest25471-21basename20:35:001
1588499220,21cyclictest31653-21apt-get19:44:441
1588499220,21cyclictest30211-21munin-run00:05:001
1588499220,21cyclictest21129-21apt-get23:49:441
15882992220,1cyclictest8044-21munin-run00:30:000
1588299220,21cyclictest5751-21apt-get21:04:440
1588299220,21cyclictest27686-21dump-pmu-power00:00:000
1588299220,21cyclictest27069-21apt-get22:54:470
1588299220,21cyclictest0-21swapper/022:10:000
1588299220,1cyclictest8672-21munin-plugin-st20:00:000
1588299220,1cyclictest30288-21munin-run20:45:000
1588299220,1cyclictest13302-21awk23:30:000
1588299220,1cyclictest10879-21idleruntime-cro23:25:000
15887992120,1cyclictest0-21swapper/300:09:463
15887992120,0cyclictest21300-21apt-get20:29:453
15887992119,1cyclictest0-21swapper/322:05:003
15887992119,1cyclictest0-21swapper/319:25:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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