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2026-05-29 - 19:23

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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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Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack3slot6s.osadl.org (updated Fri May 29, 2026 12:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36422111100,6sleep30-21swapper/307:07:393
3708210998,6sleep00-21swapper/007:08:230
3578210184,12sleep20-21swapper/207:06:502
377429887,6sleep10-21swapper/107:09:081
235512850,0sleep20-21swapper/209:59:072
94202700,0sleep20-21swapper/210:16:412
64462270,7sleep30-21swapper/309:05:173
116492250,1sleep30-21swapper/311:26:173
387399231,20cyclictest4754-21kworker/u8:212:35:093
387399221,19cyclictest0-21swapper/310:40:113
387299210,4cyclictest0-21swapper/211:08:052
387199210,19cyclictest0-21swapper/112:35:111
387399200,2cyclictest0-21swapper/310:55:123
387399200,2cyclictest0-21swapper/310:55:113
3872992017,2cyclictest4323-21kworker/u8:207:46:012
3872992017,2cyclictest29169-21kworker/u8:109:32:022
387299200,4cyclictest0-21swapper/210:49:052
3873991916,2cyclictest32105-21kworker/u8:109:23:033
3872991916,2cyclictest24167-21kworker/u8:208:31:052
3872991916,2cyclictest24167-21kworker/u8:208:27:042
387399182,11cyclictest0-21swapper/310:26:043
3873991815,2cyclictest29169-21kworker/u8:109:32:063
3873991815,2cyclictest21307-21kworker/u8:111:39:043
3873991815,2cyclictest16481-21kworker/u8:110:18:043
3872991815,2cyclictest4323-21kworker/u8:207:34:052
3872991815,2cyclictest4115-21kworker/u8:311:38:052
3872991815,2cyclictest32105-21kworker/u8:108:52:012
3872991815,2cyclictest30646-21kworker/u8:211:51:042
3872991815,2cyclictest24167-21kworker/u8:208:22:042
3872991815,2cyclictest16432-21kworker/u8:309:20:022
387299180,13cyclictest0-21swapper/209:35:042
3871991814,2cyclictest0-21swapper/109:35:111
3873991714,2cyclictest6100-21kworker/u8:210:24:053
3873991714,2cyclictest4323-21kworker/u8:207:19:043
3873991714,2cyclictest15280-21kworker/u8:112:19:043
3873991713,2cyclictest10045-21ssh12:33:053
3872991714,2cyclictest7796-21kworker/u8:209:14:042
3872991714,2cyclictest6080-21kworker/u8:211:04:042
3872991714,2cyclictest4754-21kworker/u8:212:39:052
3872991714,2cyclictest4323-21kworker/u8:207:54:052
3872991714,2cyclictest4323-21kworker/u8:207:18:042
3872991714,2cyclictest4115-21kworker/u8:311:28:042
3872991714,2cyclictest4115-21kworker/u8:311:23:052
3872991714,2cyclictest32434-21kworker/u8:110:41:042
3872991714,2cyclictest32105-21kworker/u8:109:19:042
3872991714,2cyclictest28692-21kworker/u8:011:46:052
3872991714,2cyclictest1602-21kworker/u8:009:51:042
3872991714,2cyclictest15169-21kworker/u8:310:59:052
3872991714,2cyclictest15169-21kworker/u8:310:59:042
3872991714,2cyclictest10580-21kworker/u8:310:39:052
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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