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2026-07-22 - 09:47

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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  Intel
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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack5slot4s.osadl.org (updated Wed Jul 22, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17363522120,2sleep3481ktimers/323:37:473
4099849996354,6cyclictest4099699-21latency_hist19:10:011
4099847995142,6cyclictest56408-21latency_hist21:40:010
4099847995044,4cyclictest66116-21kworker/u8:0+events_unbound21:55:010
4099849994939,7cyclictest278-21systemd-journal21:05:021
4099849994436,6cyclictest66298-21latency_hist21:50:011
4099849994436,6cyclictest278-21systemd-journal21:07:441
4099847994438,4cyclictest66116-21kworker/u8:0+flush-8:000:05:010
4099847994434,8cyclictest4175930-21apt-get20:25:000
4099847994432,5cyclictest76238-21kworker/u8:2+events_unbound22:32:570
4099849994236,5cyclictest4099724-21kworker/u8:2+flush-8:020:12:431
4099849994133,6cyclictest278-21systemd-journal19:42:441
4099849994132,6cyclictest195132-21latency_hist00:00:011
1908302410,3chrt577-21kworker/3:2-events23:57:413
4099849994032,6cyclictest169885-21kworker/u8:1+flush-8:000:37:521
4099849993834,3cyclictest3272820-21kworker/u8:3+flush-8:019:37:431
4099849993833,4cyclictest4085034-21kworker/u8:1+flush-8:019:47:431
4099849993829,6cyclictest278-21systemd-journal20:52:441
4099847993833,4cyclictest3272820-21kworker/u8:3+flush-8:020:07:420
4099847993830,6cyclictest17271-21apt-get21:02:390
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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