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2026-08-01 - 10:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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 here to display the system's profile data or here to proceed to next system.
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 20 highest latencies:
System rack2slot7s.osadl.org (updated Sat Aug 01, 2026 00:43:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3932530994738,6cyclictest4072541-21latency_hist00:00:031
3932529994538,5cyclictest4011470-21systemd-run22:20:020
3932530994436,5cyclictest4032706-21cron22:55:001
3932529994337,4cyclictest3986962-21awk21:40:010
3932531994233,6cyclictest3953533-21tr20:20:012
3932529994236,4cyclictest4055665-21find23:31:000
3932529994235,4cyclictest4026638-21systemd-run22:45:010
3932530994135,3cyclictest0-21swapper/122:05:011
3932530994133,5cyclictest4080429-21sh00:15:011
3932530994133,5cyclictest4060868-21aten_r2power_vo23:40:401
3932530994133,5cyclictest3968510-21diskmemload00:15:381
3932529994134,4cyclictest4095720-21cron00:40:010
3932529994134,4cyclictest4095720-21cron00:40:010
3932531994033,5cyclictest4023671-21latency_hist22:40:022
3932531994033,5cyclictest4023671-21latency_hist22:40:022
3932531994032,5cyclictest3977725-21ssh21:25:002
3932531994032,3cyclictest0-21swapper/221:15:502
3932529994031,7cyclictest3946024-21sh19:55:020
393252999401,32cyclictest151ktimers/020:15:490
3932531993930,5cyclictest4066408-21systemd-run23:50:022
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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