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2026-07-25 - 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 Sat Jul 25, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
377669023520,6sleep3451irq_work/300:27:473
3458553996035,22cyclictest3519727-21latency_hist20:10:010
3458553995835,20cyclictest3504905-21latency_hist19:55:010
3458558995145,5cyclictest3421532-21kworker/u8:0+flush-8:020:02:521
3458558995144,5cyclictest3505135-21kworker/u8:3+events_unbound21:52:541
3458558995043,5cyclictest3589615-21kworker/u8:2+flush-8:022:22:541
3458558994842,4cyclictest3505135-21kworker/u8:3+events_unbound22:47:541
3458558994738,7cyclictest3718278-21latency_hist23:30:011
3458553994515,6cyclictest3593644-21sshd21:22:520
3458553994422,20cyclictest278-21systemd-journal22:05:510
3458558994334,6cyclictest3688662-21latency_hist23:00:001
3458558994233,6cyclictest278-21systemd-journal23:20:001
3458558994232,8cyclictest278-21systemd-journal22:10:521
3458553994224,16cyclictest3699311-21grep23:12:400
3458562994135,4cyclictest3505135-21kworker/u8:3+flush-8:020:57:532
3458558994134,5cyclictest3718546-21kworker/u8:0+events_unbound23:52:531
3458558994134,5cyclictest3589615-21kworker/u8:2+events_unbound23:57:521
3458553993920,17cyclictest395-21dbus-daemon20:50:000
3458553993826,9cyclictest278-21systemd-journal20:00:000
3458553993818,19cyclictest3757683-21unixbench_singl00:07:570
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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