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2026-05-19 - 11:31

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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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.

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 100 highest latencies:
System rack5slot4s.osadl.org (updated Tue May 19, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
37010322660,6sleep20-21swapper/222:30:562
37010322660,6sleep20-21swapper/222:30:552
3498237995142,6cyclictest3624201-21latency_hist21:15:011
3498237994941,6cyclictest3594576-21latency_hist20:45:011
3498237994940,6cyclictest3753118-21latency_hist23:25:011
3498232994942,5cyclictest3514972-21base6419:25:000
3498232994941,5cyclictest3777786-21latency_hist23:50:000
3498237994839,6cyclictest3738276-21latency_hist23:10:011
3498232994837,9cyclictest3727458-21ntpq22:55:590
3498232994741,4cyclictest3599258-21kworker/u8:3+flush-8:021:46:000
3498237994539,4cyclictest3478725-21kworker/u8:1+flush-8:020:05:511
3498237994536,6cyclictest3520044-21latency_hist19:30:011
3498237994536,6cyclictest3520044-21latency_hist19:30:011
3498232994438,4cyclictest3498083-21kworker/u8:0+flush-8:021:16:040
3498232994437,5cyclictest3678457-21kworker/u8:2+flush-8:022:20:530
3498237994337,4cyclictest3599258-21kworker/u8:3+flush-8:023:51:041
3498237994334,6cyclictest3639054-21latency_hist21:30:011
3498232994336,5cyclictest2658328-21kworker/u8:3+flush-8:019:30:510
3498237994238,3cyclictest3498083-21kworker/u8:0+flush-8:020:31:031
3498237994236,4cyclictest3478725-21kworker/u8:1+flush-8:020:46:041
3498237994235,5cyclictest3740997-21kworker/u8:0+flush-8:023:16:051
3498237994234,6cyclictest3549071-21ntpq19:56:041
3498237994234,5cyclictest3589617-21latency_hist20:40:011
3498237994232,8cyclictest3573737-21ntpq20:21:001
3498232994132,6cyclictest3817457-21latency_hist00:30:010
3498232994131,8cyclictest3682757-21ntpq22:11:010
36827872400,3sleep20-21swapper/222:11:022
3498241994036,3cyclictest3812084-21kworker/u8:1+events_unbound00:31:222
3498241994032,6cyclictest1704890-21systemd-journal19:20:332
3498237994034,4cyclictest3740997-21kworker/u8:0+flush-8:000:21:081
3498237994031,6cyclictest3678628-21latency_hist22:10:011
3498232994034,4cyclictest3549896-21kworker/u8:2+flush-8:020:26:010
3498237993933,4cyclictest3644215-21kworker/u8:1+flush-8:021:45:501
3498237993929,8cyclictest3613487-21ntpq21:01:011
349823299391,34cyclictest3827398-21munin-run00:40:010
3498232993833,4cyclictest3498083-21kworker/u8:0+flush-8:020:10:510
34980402384,31sleep20-21swapper/219:09:572
3498237993732,4cyclictest3498083-21kworker/u8:0+flush-8:019:20:001
3498237993732,3cyclictest3740997-21kworker/u8:0+flush-8:000:05:001
3498237993730,5cyclictest3498083-21kworker/u8:0+flush-8:020:15:521
3498232993731,4cyclictest3644215-21kworker/u8:1+flush-8:022:06:080
3498232993728,7cyclictest3653081-21ntpq21:41:010
3498232993728,6cyclictest3498056-21latency_hist19:10:010
3498237993631,3cyclictest3739304-21irqrtprio23:10:541
3498237993630,4cyclictest1704890-21systemd-journal23:55:331
3498237993629,5cyclictest3664070-21apt-get21:55:451
3498232993630,4cyclictest3727684-21kworker/u8:2+events_unbound23:20:000
3498232993628,6cyclictest3782307-21grep23:51:110
3498232993628,6cyclictest3757212-21ntpq23:26:040
3498241993531,3cyclictest3498083-21kworker/u8:0+events_unbound20:16:072
3498237993529,4cyclictest3698746-21apt-get22:30:471
3498237993529,4cyclictest3698746-21apt-get22:30:461
3498232993531,3cyclictest3599258-21kworker/u8:3+flush-8:022:45:540
3498232993530,4cyclictest3478725-21kworker/u8:1+flush-8:020:45:520
3498232993529,4cyclictest3703407-21kworker/u8:0+flush-8:022:40:520
3498232993529,4cyclictest3498083-21kworker/u8:0+flush-8:021:31:030
3498232993525,8cyclictest3702490-21ntpq22:31:000
3498232993525,8cyclictest3702490-21ntpq22:30:590
3498237993428,4cyclictest3683920-21apt-get22:15:471
3498232993430,3cyclictest3727684-21kworker/u8:2+flush-8:023:31:060
3498232993429,4cyclictest3478725-21kworker/u8:1+flush-8:019:46:060
3498232993427,5cyclictest3498083-21kworker/u8:0+events_unbound19:15:010
3498232993425,6cyclictest3599258-21kworker/u8:3+flush-8:023:06:030
34980072344,9sleep10-21swapper/119:09:331
3498237993328,3cyclictest3644215-21kworker/u8:1+flush-8:023:01:081
3498237993322,3cyclictest3599258-21kworker/u8:3+flush-8:000:15:551
3498232993329,3cyclictest3599258-21kworker/u8:3+flush-8:021:56:030
3498232993328,4cyclictest3478725-21kworker/u8:1+flush-8:019:26:070
3498232993328,4cyclictest3478725-21kworker/u8:1+flush-8:019:26:060
3498232993327,4cyclictest3740997-21kworker/u8:0+flush-8:023:11:050
3498232993325,5cyclictest3740997-21kworker/u8:0+flush-8:000:11:010
3498237993226,4cyclictest3554630-21journal-offline20:02:331
3498237993224,6cyclictest3498083-21kworker/u8:0+flush-8:019:21:031
3498232993228,3cyclictest3498083-21kworker/u8:0+flush-8:021:25:500
3498232993227,4cyclictest3599258-21kworker/u8:3+flush-8:022:01:030
3498232993227,4cyclictest3498083-21kworker/u8:0+flush-8:021:11:040
3498232993227,4cyclictest3498083-21kworker/u8:0+flush-8:020:36:000
3498232993226,5cyclictest3599258-21kworker/u8:3+flush-8:023:36:070
3498232993221,9cyclictest3707658-21ntpq22:36:010
3498241993122,7cyclictest1704890-21systemd-journal22:55:012
3498237993127,3cyclictest3713517-21idleruntime-cro22:45:011
3498237993125,4cyclictest3614661-21apt-get21:05:491
3498237993125,4cyclictest3614661-21apt-get21:05:491
3498237993124,5cyclictest3579539-21apt-get20:30:011
3498232993126,4cyclictest3599258-21kworker/u8:3+flush-8:021:21:090
3498232993126,3cyclictest3478725-21kworker/u8:1+events_unbound19:50:560
3498232993124,5cyclictest3807539-21cron00:20:010
3498232993121,8cyclictest3528995-21ntpq19:36:000
3498241993021,6cyclictest1704890-21systemd-journal20:00:012
3498237993025,4cyclictest3644215-21kworker/u8:1+flush-8:021:36:091
3498237993025,3cyclictest3679659-21irqrtprio22:10:551
3498237993023,5cyclictest3812810-21apt-get00:25:481
3498232993025,4cyclictest3727684-21kworker/u8:2+flush-8:000:05:530
3498232993025,4cyclictest3727684-21kworker/u8:2+flush-8:000:05:530
3498232993025,3cyclictest3599258-21kworker/u8:3+events_unbound23:41:030
3498232993024,4cyclictest3599258-21kworker/u8:3+flush-8:021:00:480
3498232993023,5cyclictest3599258-21kworker/u8:3+flush-8:021:05:550
3498232993023,5cyclictest3599258-21kworker/u8:3+flush-8:021:05:550
3498237992924,4cyclictest3599258-21kworker/u8:3+flush-8:023:49:391
3498237992924,3cyclictest3522514-21kthreadcore19:30:561
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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