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2026-08-23 - 11:03

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #1

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 rackeslot1s.osadl.org (updated Sun Aug 23, 2026 00:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3567845214255,73sleep20-21swapper/219:09:562
3567655214253,74sleep30-21swapper/319:07:273
373369021110,2sleep0151ktimers/021:25:320
356759929352,32sleep00-21swapper/019:06:440
356760028957,23sleep10-21swapper/119:06:451
38154942290,1sleep13815498-21tr22:30:411
3568022992017,1cyclictest0-21swapper/322:15:003
356802099195,13cyclictest594-21dbus-daemon23:30:001
3568019991915,3cyclictest3742453-21kthreadcore21:30:420
356801999188,8cyclictest255814-21systemd-journal00:34:400
3568019991815,2cyclictest3905026-21tr23:45:360
356802099171,6cyclictest39701142cut00:35:411
3568020991713,3cyclictest594-21dbus-daemon21:40:001
356801999173,3cyclictest14-21ksoftirqd/020:27:400
3568019991714,3cyclictest3568013-21cyclictest20:05:010
3568019991714,2cyclictest3892061-21systemd-run23:35:010
3568019991713,3cyclictest3973889-21systemd-run00:40:010
3568019991713,3cyclictest3797844-21kthreadcore22:15:420
356801999170,5cyclictest3928792-21apt00:05:000
356802299169,5cyclictest0-21swapper/320:00:003
356802299167,8cyclictest3690318-21turbostat20:54:553
3568022991612,1cyclictest3745411-21turbostat21:35:003
356802099168,7cyclictest594-21dbus-daemon22:50:461
3568020991613,2cyclictest594-21dbus-daemon20:15:001
3568020991613,2cyclictest3568013-21cyclictest21:30:371
356801999167,8cyclictest3746837-21cut21:35:410
356801999167,7cyclictest255814-21systemd-journal22:15:020
356801999167,7cyclictest255814-21systemd-journal00:09:410
356801999164,9cyclictest3650972-21cut20:15:410
3568019991613,2cyclictest621-21systemd-logind00:20:000
3568019991613,2cyclictest594-21dbus-daemon22:37:590
3568019991613,2cyclictest3856980-21kthreadcore23:05:420
3568019991613,2cyclictest3714731-21cron21:10:000
3568019991613,2cyclictest368968-21polkitd21:55:000
3568019991612,3cyclictest67-21kauditd21:44:560
3568019991612,3cyclictest3825333-21aten_repower_vo22:40:350
3568019991611,4cyclictest67-21kauditd22:34:550
356801999161,13cyclictest3605168-21tail19:40:250
3568022991513,1cyclictest0-21swapper/320:50:003
3568022991512,1cyclictest0-21swapper/320:20:003
3568022991512,1cyclictest0-21swapper/319:15:003
3568021991513,1cyclictest0-21swapper/219:10:372
356802099158,6cyclictest3630383-21sshd-session20:00:401
356802099156,8cyclictest3931648-21tr00:05:421
356802099156,7cyclictest3663232-21tr20:25:421
356802099155,9cyclictest3712284-1grep21:05:431
356802099155,9cyclictest3673789-21tr20:35:411
356802099155,6cyclictest3937375-21kthreadcore00:10:421
356802099155,6cyclictest3937375-21kthreadcore00:10:421
3568020991511,3cyclictest3846592-21kthreadcore22:55:421
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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