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2026-09-20 - 06:03

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 Sep 20, 2026 00:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
40843532910,2chrt0-21swapper/223:24:072
39160892800,6chrt0-21swapper/320:34:073
38476812660,5sleep20-21swapper/219:25:002
3830550995850,6cyclictest4101292-21latency_hist23:40:000
3830550995242,7cyclictest278-21systemd-journal19:10:010
3830555995146,4cyclictest3916782-21kworker/u8:0+flush-8:020:44:161
3830550995141,8cyclictest4012267-21diskstats22:14:020
40833462490,1sleep14083351-21cut23:24:061
3830555994936,10cyclictest278-21systemd-journal21:44:101
3830555994842,4cyclictest3922243-21kworker/u8:3+flush-8:022:04:021
3830555994742,4cyclictest4121145-21kworker/u8:0+flush-8:000:09:201
3830555994741,5cyclictest3887395-21kworker/u8:1+events_unbound20:29:161
39424022460,3sleep375-21kworker/3:1-events21:04:003
3830559994540,3cyclictest3810908-21kworker/u8:1+events_unbound19:45:002
3830555994338,4cyclictest4016629-21kworker/u8:1+flush-8:022:34:021
3830555994337,4cyclictest3916782-21kworker/u8:0+flush-8:022:09:001
39956812420,2chrt451irq_work/321:54:083
3830555994237,4cyclictest3916782-21kworker/u8:0+flush-8:020:54:021
3830555994237,4cyclictest3916782-21kworker/u8:0+flush-8:020:54:021
3830555994237,4cyclictest3830767-21kworker/u8:0+flush-8:019:54:051
3830555994236,4cyclictest4116067-21kworker/u8:4+flush-8:000:24:081
3830559994137,3cyclictest4016629-21kworker/u8:1+flush-8:022:39:112
3830555994137,3cyclictest3830767-21kworker/u8:0+flush-8:019:49:041
3830550994133,6cyclictest4106241-21latency_hist23:45:000
3830550994131,8cyclictest4021383-21apt-get22:20:000
3830555994036,3cyclictest3916782-21kworker/u8:0+flush-8:021:14:151
3830555994035,4cyclictest3887395-21kworker/u8:1+flush-8:020:59:011
3830555994034,4cyclictest4056334-21kworker/u8:3+events_unbound23:14:101
3830555994034,4cyclictest3867601-21kworker/u8:3+events_unbound19:59:091
3830555993930,6cyclictest3897027-21latency_hist20:15:011
3830550993931,6cyclictest4131302-21latency_hist00:10:010
3830550993930,6cyclictest278-21systemd-journal23:20:000
3830555993833,4cyclictest3951677-21kworker/u8:2+flush-8:022:24:031
3830555993833,4cyclictest3916782-21kworker/u8:0+flush-8:020:39:031
3830555993833,4cyclictest3887395-21kworker/u8:1+flush-8:020:24:141
3830555993832,4cyclictest3916782-21kworker/u8:0+events_unbound21:29:121
3830555993832,4cyclictest3887395-21kworker/u8:1+events_unbound20:48:581
3830555993831,5cyclictest3887133-21latency_hist20:05:011
3830555993830,5cyclictest4036488-21kworker/u8:0+flush-8:022:39:101
383055099382,27cyclictest4026631-21kworker/0:2+events23:45:170
3830555993730,5cyclictest3810908-21kworker/u8:1+flush-8:019:20:001
3830555993728,5cyclictest4036488-21kworker/u8:0+events_unbound22:44:111
3830555993724,10cyclictest4066436-21apt-key23:05:001
3830555993628,6cyclictest4091256-21kworker/u8:0+events_unbound23:39:051
3830550993626,8cyclictest4025988-21ntpq22:24:110
3830550993625,9cyclictest4045798-21ntpq22:44:110
3830550993625,2cyclictest0-21swapper/022:00:000
38855262350,6sleep3451irq_work/320:04:103
3830559993531,3cyclictest4130737-21kworker/u8:2+flush-8:000:09:202
3830555993528,5cyclictest4016629-21kworker/u8:1+events_unbound22:19:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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