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2026-04-20 - 20:02

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 Mon Apr 20, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
316572422000,3sleep375-21kworker/3:1+events11:11:173
2924266995450,3cyclictest3055177-21kworker/u8:3+flush-8:009:41:282
2924266995442,4cyclictest2924380-21kworker/u8:2+flush-8:008:16:232
2924263995346,5cyclictest3005694-21kworker/u8:0+events_unbound08:31:251
29660652510,6sleep30-21swapper/307:50:003
2924263995147,3cyclictest3099384-21kworker/u8:2+flush-8:010:16:291
2924263995146,4cyclictest3169703-21kworker/u8:0+events_unbound11:46:131
2924266995045,4cyclictest3099384-21kworker/u8:2+events_unbound10:16:262
2924266995045,3cyclictest3223628-21kworker/u8:3+flush-8:012:16:272
2924258995040,7cyclictest3209561-21latency_hist11:55:010
2924263994944,4cyclictest3194442-21kworker/u8:2+flush-8:012:01:241
2924263994944,4cyclictest3129618-21kworker/u8:1+events_unbound11:16:271
2924258994939,7cyclictest2945886-21latency_hist07:30:010
2924263994844,3cyclictest3194442-21kworker/u8:2+flush-8:012:11:261
2924263994844,3cyclictest2924380-21kworker/u8:2+flush-8:008:46:291
2924263994843,4cyclictest2892774-21kworker/u8:1+flush-8:007:36:141
2924263994843,3cyclictest3083952-21ntpq09:46:211
2924263994843,3cyclictest2924380-21kworker/u8:2+flush-8:008:11:281
2924263994839,7cyclictest3074944-21latency_hist09:40:011
2924263994837,8cyclictest280-21systemd-journal10:45:011
292425899481,45cyclictest1-21systemd11:45:000
2924266994742,4cyclictest3169703-21kworker/u8:0+events_unbound11:41:282
2924263994743,3cyclictest3169703-21kworker/u8:0+flush-8:012:06:291
2924263994742,3cyclictest2096582-21kworker/u8:4+events_unbound08:01:271
2924263994741,4cyclictest3045502-21kworker/u8:2+events_unbound09:26:131
2924263994737,8cyclictest3103766-21ntpq10:06:221
2924263994737,8cyclictest3103766-21ntpq10:06:221
2924258994740,5cyclictest2924085-21latency_hist07:10:010
2924258994739,6cyclictest3133492-21ntpq10:36:210
2924266994642,3cyclictest2924380-21kworker/u8:2+events_unbound07:56:282
2924266994641,4cyclictest3169703-21kworker/u8:0+flush-8:012:36:242
2924263994642,3cyclictest3099384-21kworker/u8:2+flush-8:010:51:231
2924263994642,3cyclictest2096582-21kworker/u8:4+flush-8:007:31:271
2924263994640,5cyclictest3169703-21kworker/u8:0+events_unbound11:56:231
2924263994636,7cyclictest3159336-21latency_hist11:05:011
2924263994541,3cyclictest3236881-21kworker/u8:1+flush-8:012:26:261
2924263994541,3cyclictest3236881-21kworker/u8:1+flush-8:012:26:261
2924263994541,3cyclictest3065253-21kworker/u8:0+flush-8:010:01:271
2924263994540,4cyclictest3194442-21kworker/u8:2+flush-8:012:21:141
2924263994540,4cyclictest3099384-21kworker/u8:2+flush-8:010:21:231
2924263994441,2cyclictest3129618-21kworker/u8:1+events_unbound10:36:091
2924263994440,3cyclictest3148887-21kworker/u8:3+flush-8:011:06:111
2924263994440,3cyclictest3119694-21kworker/u8:3+flush-8:010:26:141
2924263994440,3cyclictest3109776-21kworker/u8:0+flush-8:010:46:141
2924266994339,3cyclictest3055177-21kworker/u8:3+flush-8:009:51:252
2924263994339,3cyclictest2892774-21kworker/u8:1+events_unbound07:16:111
2924263994336,5cyclictest2990980-21apt-get08:16:081
2924263994335,3cyclictest3055177-21kworker/u8:3+events_unbound09:56:291
2924263994332,8cyclictest280-21systemd-journal11:32:521
2924263994329,9cyclictest280-21systemd-journal12:20:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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