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2026-05-03 - 21:15

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 May 03, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4491532910,2chrt75-21kworker/3:1-events09:56:133
278992996747,6cyclictest554228-21latency_hist11:45:011
278995995952,5cyclictest242140-21kworker/u8:2+flush-8:008:46:162
278990995850,5cyclictest529532-21latency_hist11:20:010
278992995647,6cyclictest519444-21latency_hist11:10:011
278990995647,6cyclictest549278-21latency_hist11:40:010
278990995443,8cyclictest485172-21diskstats10:36:020
278992995243,6cyclictest588825-21latency_hist12:20:011
278990995140,8cyclictest401062-21diskstats09:11:030
278995995043,4cyclictest519831-21base6411:10:002
278990995040,7cyclictest509533-21latency_hist11:00:010
4697872480,3sleep2371rcuc/210:19:592
278990994842,4cyclictest445936-21kworker/u8:0+events_unbound11:01:180
278990994639,5cyclictest533600-21ntpq11:21:110
278990994635,5cyclictest242140-21kworker/u8:2+flush-8:007:21:130
278995994539,4cyclictest405469-21kworker/u8:2+events_unbound09:46:192
278992994537,6cyclictest3539273-21kworker/u8:3+flush-8:007:26:171
278992994436,6cyclictest280-21systemd-journal09:30:001
278992994435,7cyclictest499955-21/usr/sbin/munin10:51:111
278990994435,6cyclictest474726-21latency_hist10:25:010
278992994237,4cyclictest414615-21ntpq09:21:151
278990994232,4cyclictest534509-21kworker/u8:1+flush-8:011:31:120
27857524228,8sleep30-21swapper/307:06:563
278990994133,5cyclictest300922-21latency_hist07:30:010
278990994130,9cyclictest460451-21diskstats10:11:040
278990994130,9cyclictest460451-21diskstats10:11:030
278995994034,5cyclictest478793-21kworker/u8:1+flush-8:011:16:172
278992994031,6cyclictest370767-21base6408:40:011
278992993933,4cyclictest395544-21latency_hist09:05:011
278992993929,7cyclictest280-21systemd-journal10:01:571
278990993933,4cyclictest405469-21kworker/u8:2+events_unbound09:46:170
278992993829,6cyclictest569032-21latency_hist12:00:011
278990993831,5cyclictest284159-21kworker/u8:0+flush-8:007:36:040
278995993727,8cyclictest365234-21cp08:35:012
278992993731,4cyclictest400812-21apt-get09:11:001
278995993630,4cyclictest284159-21kworker/u8:0+flush-8:009:41:192
278992993625,9cyclictest282983-21ntpq07:11:121
278990993630,5cyclictest284159-21kworker/u8:0+flush-8:008:41:170
278990993630,4cyclictest242140-21kworker/u8:2+events_unbound07:15:010
278992993530,3cyclictest574160-21latency_hist12:05:011
278992993530,3cyclictest574160-21latency_hist12:05:011
278992993528,5cyclictest459875-21latency_hist10:10:011
278992993527,6cyclictest280-21systemd-journal09:31:581
278990993528,5cyclictest445936-21kworker/u8:0+flush-8:010:01:180
278990993526,6cyclictest242140-21kworker/u8:2+flush-8:008:16:130
278990993525,8cyclictest574582-21diskstats12:06:030
27899099350,32cyclictest1-21systemd11:15:010
278992993428,4cyclictest445936-21kworker/u8:0+flush-8:010:41:031
278992993428,4cyclictest280-21systemd-journal11:00:581
278992993427,5cyclictest340784-21apt-get08:10:591
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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