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2026-01-12 - 10:42

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 100 highest latencies:
System rack3slot6s.osadl.org (updated Mon Jan 12, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12655211996,18sleep30-21swapper/319:09:033
12596211897,16sleep10-21swapper/119:08:171
12716211496,12sleep20-21swapper/219:09:502
12630210796,6sleep00-21swapper/019:08:440
301062820,0sleep00-21swapper/022:22:570
170152730,1sleep00-21swapper/020:40:130
103122700,0sleep30-21swapper/320:20:253
284312680,2sleep31275999cyclictest21:45:133
39722540,1sleep10-21swapper/123:41:391
163362430,1sleep316344-21unixbench_singl20:35:273
1275899371,18cyclictest0-21swapper/222:25:132
198502290,0sleep30-21swapper/323:24:003
1275899221,2cyclictest0-21swapper/222:30:122
1275899221,19cyclictest11648-21ssh23:15:122
1275899221,19cyclictest0-21swapper/223:25:132
1275899221,19cyclictest0-21swapper/220:50:102
169122210,0sleep20-21swapper/222:08:122
1275699211,3cyclictest0-21swapper/020:20:100
1275699210,2cyclictest0-21swapper/020:45:110
1275699210,2cyclictest0-21swapper/019:30:110
12758992015,3cyclictest24181-21ssh00:05:112
1275699200,18cyclictest0-21swapper/019:40:100
1275899190,14cyclictest0-21swapper/223:46:042
1275999180,16cyclictest28838-21diskmemload22:25:133
1275999180,13cyclictest0-21swapper/323:43:033
1275999180,13cyclictest0-21swapper/323:12:053
1275999180,13cyclictest0-21swapper/300:35:053
12757991815,2cyclictest29055-21kworker/u8:122:51:051
12757991815,2cyclictest16984-21kworker/u8:021:03:051
1275799180,3cyclictest0-21swapper/100:03:041
1275999170,15cyclictest0-21swapper/321:25:103
1275999170,12cyclictest0-21swapper/320:05:053
12758991712,3cyclictest17270-21kworker/u8:023:50:052
12757991714,2cyclictest6276-21kworker/u8:020:24:051
12757991714,2cyclictest16984-21kworker/u8:020:54:041
12757991714,2cyclictest14275-21kworker/u8:200:36:051
12757991714,2cyclictest14101-21kworker/u8:123:21:041
12757991713,3cyclictest0-21swapper/121:25:101
1275699171,14cyclictest9787-21fschecks_count22:00:150
1275999160,14cyclictest0-21swapper/300:11:243
1275999160,12cyclictest0-21swapper/322:36:053
1275999160,11cyclictest0-21swapper/323:25:053
1275899162,2cyclictest0-21swapper/222:10:052
1275799161,3cyclictest7458-21runrttasks23:50:161
12757991613,2cyclictest6276-21kworker/u8:020:17:041
12757991613,2cyclictest4615-21kworker/u8:021:58:041
12757991613,2cyclictest32368-21kworker/u8:000:15:051
12757991613,2cyclictest30572-21kworker/u8:222:06:041
12757991613,2cyclictest29208-21kworker/u8:220:12:051
12757991613,2cyclictest25156-21kworker/u8:019:48:051
12757991613,2cyclictest25156-21kworker/u8:019:43:051
12757991613,2cyclictest22550-21kworker/u8:219:34:051
12757991613,2cyclictest20111-21kworker/u8:223:26:051
12757991613,2cyclictest17270-21kworker/u8:023:35:041
12757991613,2cyclictest16984-21kworker/u8:020:55:051
12757991613,2cyclictest13019-21kworker/u8:120:36:051
12757991613,2cyclictest10944-21kworker/u8:219:10:041
12757991613,2cyclictest10389-21kworker/u8:220:32:051
12757991613,2cyclictest10389-21kworker/u8:220:29:041
1275799161,2cyclictest0-21swapper/121:46:051
1275799161,13cyclictest6050-21taskset22:31:561
1275799161,13cyclictest0-21swapper/123:48:471
1275799161,13cyclictest0-21swapper/121:10:121
1275799160,14cyclictest0-21swapper/121:31:481
1275799160,14cyclictest0-21swapper/121:31:481
1275799160,13cyclictest26172-21taskset22:55:061
12756991612,2cyclictest16984-21kworker/u8:021:12:050
12756991611,3cyclictest193052chrt21:35:120
12756991611,3cyclictest193052chrt21:35:110
91032150,0sleep00-21swapper/022:00:000
12759991511,2cyclictest5114-21latency_hist00:20:013
12759991510,3cyclictest26832-21munin-plugin-st21:04:593
1275999150,13cyclictest15233-21ssh23:55:073
1275899152,7cyclictest0-21swapper/219:39:592
1275899151,3cyclictest13209-21ssh22:40:122
12758991512,2cyclictest4137-21kworker/u8:223:06:042
1275899150,3cyclictest26543-21switchtime23:30:252
1275899150,13cyclictest11118-21switchtime00:25:262
12757991512,2cyclictest4137-21kworker/u8:223:16:051
12757991512,2cyclictest29208-21kworker/u8:220:01:041
12757991512,2cyclictest25156-21kworker/u8:019:51:041
12757991512,2cyclictest22550-21kworker/u8:219:35:041
12757991512,2cyclictest17270-21kworker/u8:023:00:051
12757991512,2cyclictest14275-21kworker/u8:200:32:051
12757991512,2cyclictest14275-21kworker/u8:200:32:041
12757991512,2cyclictest13773-21kworker/u8:223:59:031
12757991510,3cyclictest0-21swapper/100:25:181
1275799150,2cyclictest0-21swapper/122:13:051
1275799150,2cyclictest0-21swapper/121:16:041
1275799150,13cyclictest0-21swapper/123:14:041
1275799150,13cyclictest0-21swapper/122:39:391
1275799150,13cyclictest0-21swapper/119:17:051
1275699150,13cyclictest0-21swapper/022:35:140
93922140,2sleep20-21swapper/221:23:402
166262140,2sleep00-21swapper/022:07:440
1275999141,2cyclictest6675-21snmpd21:16:273
12759991411,2cyclictest28838-21diskmemload23:02:513
12759991411,2cyclictest0-21swapper/322:55:093
12759991411,2cyclictest0-21swapper/300:20:413
1275999140,2cyclictest0-21swapper/321:10:163
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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