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2026-09-04 - 13:29

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 Fri Sep 04, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10989211793,18sleep30-21swapper/319:05:033
12595211199,6sleep10-21swapper/119:07:331
12733210796,6sleep00-21swapper/019:09:210
12695210279,6sleep20-21swapper/219:08:512
146862860,2sleep011-21rcuc/021:27:590
290882750,1sleep2301ktimersoftd/200:25:182
19032740,2sleep337-21rcuc/321:47:423
11352510,1sleep11134-21ssh23:57:111
12814992925,2cyclictest12001-21kworker/u8:123:03:042
12815992623,2cyclictest30422-21kworker/u8:123:28:043
12815992522,2cyclictest822-21kworker/u8:223:09:043
12815992522,2cyclictest24710-21kworker/u8:100:07:043
12814992522,2cyclictest822-21kworker/u8:222:52:052
179982240,0sleep00-21swapper/022:36:020
12815992421,2cyclictest9024-21kworker/u8:121:59:043
12815992421,2cyclictest6305-21kworker/u8:022:57:043
12815992421,2cyclictest29924-21kworker/u8:022:33:043
12815992421,2cyclictest18639-21kworker/u8:023:18:043
12814992421,2cyclictest8559-21kworker/u8:000:34:042
12814992421,2cyclictest8559-21kworker/u8:000:10:042
12814992421,2cyclictest4455-21kworker/u8:223:33:042
12814992421,2cyclictest30422-21kworker/u8:123:27:042
12814992421,2cyclictest22871-21kworker/u8:122:20:042
156382230,1sleep011-21rcuc/022:34:210
12815992320,2cyclictest5906-21kworker/u8:021:42:053
12815992320,2cyclictest5906-21kworker/u8:021:23:043
12814992320,2cyclictest5906-21kworker/u8:021:38:042
12814992320,2cyclictest22871-21kworker/u8:122:12:042
12814992320,2cyclictest15151-21kworker/u8:122:35:042
12813992320,2cyclictest8490-21kworker/u8:222:37:031
12813992319,3cyclictest22871-21kworker/u8:122:10:011
12815992219,2cyclictest30422-21kworker/u8:123:23:043
12815992219,2cyclictest2975-21kworker/u8:021:52:043
12815992219,2cyclictest22172-21kworker/u8:100:22:053
1281499222,18cyclictest0-21swapper/219:47:042
1281499222,18cyclictest0-21swapper/219:12:032
12814992219,2cyclictest9024-21kworker/u8:122:03:042
12814992219,2cyclictest8490-21kworker/u8:222:27:042
12814992219,2cyclictest29917-21kworker/u8:221:58:042
12814992219,2cyclictest24710-21kworker/u8:100:08:042
12814992219,2cyclictest24710-21kworker/u8:100:03:042
12814992219,2cyclictest16027-21kworker/u8:223:42:012
12814992219,2cyclictest11547-21kworker/u8:221:31:042
1281499220,5cyclictest0-21swapper/219:36:042
1281499220,3cyclictest0-21swapper/223:37:032
117312220,0sleep00-21swapper/000:07:570
285032210,0sleep20-21swapper/222:46:462
1281599212,2cyclictest0-21swapper/319:36:043
12815992118,2cyclictest5906-21kworker/u8:021:27:043
12815992118,2cyclictest32434-21kworker/u8:221:17:043
12815992118,2cyclictest29924-21kworker/u8:022:17:043
12815992118,2cyclictest21573-21kworker/u8:022:49:033
12815992118,2cyclictest15151-21kworker/u8:122:38:013
1281499212,2cyclictest0-21swapper/220:09:042
1281499212,2cyclictest0-21swapper/219:59:042
12814992118,2cyclictest822-21kworker/u8:223:17:042
12814992118,2cyclictest822-21kworker/u8:223:12:032
12814992118,2cyclictest5805-21kworker/u8:200:38:042
12814992118,2cyclictest24710-21kworker/u8:123:50:042
12814992118,2cyclictest22871-21kworker/u8:122:19:042
12814992118,2cyclictest14981-21kworker/u8:200:17:042
1281499210,4cyclictest0-21swapper/223:55:042
12813992118,2cyclictest24710-21kworker/u8:123:49:041
1281399211,2cyclictest0-21swapper/119:36:041
12812992115,5cyclictest0-21swapper/019:15:100
12815992017,2cyclictest21573-21kworker/u8:022:42:043
12815992017,2cyclictest18639-21kworker/u8:023:51:043
12815992017,2cyclictest11547-21kworker/u8:221:34:043
1281599201,2cyclictest0-21swapper/319:24:013
1281599201,2cyclictest0-21swapper/300:01:043
1281599200,2cyclictest0-21swapper/323:48:043
1281599200,2cyclictest0-21swapper/322:00:013
1281599200,2cyclictest0-21swapper/319:59:043
1281599200,2cyclictest0-21swapper/300:11:033
1281499202,2cyclictest0-21swapper/219:24:012
12814992017,2cyclictest8490-21kworker/u8:222:40:042
12814992017,2cyclictest822-21kworker/u8:223:08:012
12814992017,2cyclictest5906-21kworker/u8:021:40:042
12814992017,2cyclictest30422-21kworker/u8:123:22:012
12814992017,2cyclictest29924-21kworker/u8:022:30:012
12814992017,2cyclictest28858-21kworker/u8:120:11:042
12814992017,2cyclictest16027-21kworker/u8:223:47:042
12814992017,2cyclictest14605-21kworker/u8:219:19:042
1281499200,3cyclictest0-21swapper/221:50:042
1281499200,3cyclictest0-21swapper/221:18:012
1281499200,3cyclictest0-21swapper/220:51:042
12813992017,2cyclictest822-21kworker/u8:223:07:041
12813992017,2cyclictest18639-21kworker/u8:023:19:041
12813992017,2cyclictest15151-21kworker/u8:122:34:041
12812992016,3cyclictest0-21swapper/021:50:140
1281599191,2cyclictest0-21swapper/322:24:033
1281599191,2cyclictest0-21swapper/320:51:043
1281599191,2cyclictest0-21swapper/320:09:043
1281599191,2cyclictest0-21swapper/319:46:053
1281599190,2cyclictest0-21swapper/323:55:043
1281599190,2cyclictest0-21swapper/300:26:043
1281499191,2cyclictest0-21swapper/220:24:042
12813991916,2cyclictest6305-21kworker/u8:023:00:011
12813991916,2cyclictest6305-21kworker/u8:022:59:041
1281399191,2cyclictest0-21swapper/120:51:031
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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