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2026-08-16 - 16:59

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 50 highest latencies:
System rack5slot4s.osadl.org (updated Sun Aug 16, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
338827721660,3sleep3575-21kworker/3:2-events09:52:523
322279799151146,3cyclictest0-21swapper/111:17:541
322279499149131,16cyclictest3472683-21ntpq11:17:540
322280299134129,3cyclictest3472681-21sshd11:17:542
32836752990,1chrt571-21snmpd08:07:560
32910712870,3sleep20-21swapper/208:17:492
32910712870,3sleep20-21swapper/208:17:492
3222794996144,8cyclictest275-21systemd-journal09:57:530
3222797995950,6cyclictest3443668-21latency_hist10:50:011
3222797995650,5cyclictest3364743-21kworker/u8:1+flush-8:010:17:541
34741542520,3chrt0-21swapper/211:22:432
3222794995247,4cyclictest3423879-21kworker/u8:1+events_unbound11:02:570
33520742480,2sleep3575-21kworker/3:2-events09:17:493
3222802994838,7cyclictest275-21systemd-journal08:05:532
3222797994642,3cyclictest3284162-21kworker/u8:0+flush-8:009:47:541
3222797994640,4cyclictest3212931-21kworker/u8:2+events_unbound09:10:001
3222797994634,9cyclictest275-21systemd-journal07:57:541
3222797994435,6cyclictest275-21systemd-journal09:03:541
3222794994433,9cyclictest275-21systemd-journal10:15:000
3222794994433,9cyclictest275-21systemd-journal10:15:000
33641422430,3sleep20-21swapper/209:27:592
3222794994338,4cyclictest3537727-21kworker/u8:0+flush-8:012:32:430
3222797994233,6cyclictest3254647-21latency_hist07:40:011
3222797994134,5cyclictest3284312-21latency_hist08:10:001
3222797994130,9cyclictest275-21systemd-journal09:37:531
3222794994135,4cyclictest3323728-21kworker/u8:1+flush-8:009:12:440
3222802994031,7cyclictest3314633-21cat08:40:012
3222797994035,4cyclictest3517958-21kworker/u8:3+events_unbound12:12:571
3222797994035,4cyclictest3212931-21kworker/u8:2+events_unbound08:58:001
3222797994031,7cyclictest3274870-21/usr/sbin/munin08:02:521
3222797993935,3cyclictest3349850-21kworker/u8:3+events_unbound09:22:471
3222794993934,3cyclictest3284162-21kworker/u8:0+events_unbound08:37:490
3222794993929,8cyclictest275-21systemd-journal07:55:000
3222794993929,7cyclictest275-21systemd-journal10:35:000
321850223928,6sleep30-21swapper/307:07:483
32178662393,9sleep10-21swapper/107:06:091
3222802993828,7cyclictest275-21systemd-journal08:15:002
3222802993827,8cyclictest275-21systemd-journal09:40:532
3222797993832,5cyclictest2421957-21kworker/u8:1+flush-8:008:12:441
3222797993832,4cyclictest3212931-21kworker/u8:2+events_unbound08:52:561
3222797993831,5cyclictest3314746-21kworker/u8:3+flush-8:008:45:011
3222794993832,4cyclictest3304592-21kworker/u8:1+flush-8:008:32:440
3222797993732,4cyclictest3537727-21kworker/u8:0+events_unbound12:27:581
3222797993730,5cyclictest3423879-21kworker/u8:1+flush-8:011:47:531
3222797993727,8cyclictest3423175-21ntpq10:27:561
3222797993727,8cyclictest3344867-21/usr/sbin/munin09:12:571
3222797993721,10cyclictest275-21systemd-journal11:10:001
3222797993632,3cyclictest3284162-21kworker/u8:0+events_unbound08:22:431
3222797993630,4cyclictest3403364-21kworker/u8:2+flush-8:010:32:551
3222797993629,5cyclictest3523459-21kworker/u8:1+events_unbound12:22:571
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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