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2026-05-09 - 23:23

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 Sat May 09, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
345326622040,4sleep375-21kworker/3:1-events10:46:123
32843972970,1chrt3284402-21unixbench_singl07:56:151
35280702640,3sleep2371rcuc/212:05:002
35280702640,3sleep2371rcuc/212:05:002
33287762620,4chrt75-21kworker/3:1-events08:41:073
3233299995751,5cyclictest3404176-21kworker/u8:0+events_unbound11:26:110
3233301995651,3cyclictest3404176-21kworker/u8:0+events_unbound10:05:541
3233299995645,9cyclictest3512426-21ntpq11:46:080
3233304995548,5cyclictest280-21systemd-journal09:45:012
3233301995545,7cyclictest3404517-21diskstats10:00:591
3233299995448,4cyclictest3320093-21kworker/u8:2+events_unbound08:45:580
3233299995448,4cyclictest3320093-21kworker/u8:2+events_unbound08:45:580
3233299995345,5cyclictest3348641-21ntpq09:01:070
3233299995247,4cyclictest3254974-21kworker/u8:1+flush-8:008:51:110
3233299995247,4cyclictest3254974-21kworker/u8:1+flush-8:008:51:110
3233301995143,6cyclictest3320093-21kworker/u8:2+flush-8:008:41:121
3233299995143,6cyclictest280-21systemd-journal07:45:570
3233301995039,9cyclictest3508871-21diskstats11:45:581
3233299994942,5cyclictest3454211-21apt-get10:50:530
3233301994741,3cyclictest3443570-21kworker/u8:2+flush-8:011:11:091
3233301994740,5cyclictest3454186-21/usr/sbin/munin10:51:051
3233299994741,4cyclictest3260171-21kworker/u8:3+flush-8:008:31:120
3233299994737,8cyclictest3275395-21diskstats07:50:580
3233299994737,7cyclictest280-21systemd-journal09:55:000
3233304994637,7cyclictest280-21systemd-journal11:59:592
3233301994641,4cyclictest3233160-21kworker/u8:0+flush-8:007:15:591
3233301994639,4cyclictest3314951-21apt-get08:30:561
3233301994540,4cyclictest3320093-21kworker/u8:2+events_unbound08:46:071
3233301994540,4cyclictest3320093-21kworker/u8:2+events_unbound08:46:061
3233301994534,9cyclictest280-21systemd-journal10:33:071
3233299994534,8cyclictest280-21systemd-journal07:25:010
3233301994438,4cyclictest3518515-21apt-get11:55:551
3233301994333,8cyclictest280-21systemd-journal11:04:071
3233299994339,3cyclictest3289724-21kworker/u8:0+flush-8:008:06:110
3233299994336,5cyclictest3182014-21kworker/u8:1+flush-8:007:15:060
3233299994234,5cyclictest3374281-21latency_hist09:30:000
3233301994134,5cyclictest280-21systemd-journal09:44:071
3233301994131,8cyclictest3427874-21ntpq10:21:081
3233299994137,3cyclictest3349716-21kworker/u8:3+events_unbound09:20:010
3233299994136,3cyclictest3443570-21kworker/u8:2+flush-8:011:21:100
3233299994135,4cyclictest3443570-21kworker/u8:2+flush-8:012:00:380
3233299994135,4cyclictest3443570-21kworker/u8:2+flush-8:012:00:370
3233304994031,7cyclictest3319595-21apt-get08:35:002
3233301994034,5cyclictest3289724-21kworker/u8:0+flush-8:008:36:131
3233299994030,8cyclictest3343657-21ntpq08:56:060
3233299993932,5cyclictest3260171-21kworker/u8:3+flush-8:008:15:580
3233299993930,7cyclictest3409221-21apt-get10:05:520
3233299993930,6cyclictest3418772-21latency_hist10:15:010
3233304993831,5cyclictest3260171-21kworker/u8:3+flush-8:007:56:152
3233301993830,6cyclictest3553100-21apt-get12:30:541
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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