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2026-04-09 - 03:06

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 Thu Apr 09, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4388211089,16sleep00-21swapper/019:07:400
3246210985,16sleep30-21swapper/319:05:133
4467210786,16sleep20-21swapper/219:08:422
2774210178,15sleep10-21swapper/119:05:121
30132700,0sleep2301ktimersoftd/221:58:182
462199251,18cyclictest0-21swapper/122:15:111
462199201,2cyclictest0-21swapper/123:30:111
71032190,0sleep00-21swapper/022:01:520
462299190,17cyclictest0-21swapper/220:25:122
462299180,3cyclictest0-21swapper/222:49:042
462299180,3cyclictest0-21swapper/222:27:042
195562180,0sleep10-21swapper/123:55:451
4623991714,2cyclictest2976-21kworker/u8:321:28:043
4623991714,2cyclictest2125-21kworker/u8:020:38:043
462299172,2cyclictest0-21swapper/220:12:042
4622991714,2cyclictest13403-21kworker/u8:100:11:032
462299170,3cyclictest0-21swapper/220:52:042
462299170,3cyclictest0-21swapper/200:25:042
462199171,14cyclictest16350-21head19:36:031
462399162,2cyclictest22077-21ssh23:59:043
4622991613,2cyclictest9372-21kworker/u8:221:05:032
4622991613,2cyclictest6356-21kworker/u8:120:49:042
4622991613,2cyclictest3696-21kworker/u8:223:20:032
4622991613,2cyclictest2976-21kworker/u8:321:29:042
4622991613,2cyclictest29562-21kworker/u8:220:18:032
4622991613,2cyclictest17694-21kworker/u8:121:52:052
4622991613,2cyclictest12357-21kworker/u8:100:38:032
4622991613,2cyclictest10494-21kworker/u8:019:46:042
4622991613,2cyclictest10494-21kworker/u8:019:30:042
4622991613,2cyclictest10494-21kworker/u8:019:29:042
462199161,7cyclictest0-21swapper/122:37:591
4621991612,2cyclictest11696-21munin-node1
462099161,13cyclictest0-21swapper/021:50:140
462399151,3cyclictest26170-21diskstats21:15:143
4623991512,2cyclictest2976-21kworker/u8:321:43:043
462399150,12cyclictest0-21swapper/322:58:583
4622991512,2cyclictest31065-21kworker/u8:023:03:042
4622991512,2cyclictest29562-21kworker/u8:220:33:042
4622991512,2cyclictest25163-21kworker/u8:020:02:012
4622991512,2cyclictest14553-21kworker/u8:123:11:042
4622991512,2cyclictest13403-21kworker/u8:100:07:042
4622991512,2cyclictest12982-21kworker/u8:119:41:042
462199159,4cyclictest0-21swapper/123:45:141
462199152,2cyclictest0-21swapper/122:50:181
462199152,11cyclictest0-21swapper/123:20:191
462199151,3cyclictest4262-21http_loadtime23:40:131
4621991512,2cyclictest221ktimersoftd/100:12:181
462199150,13cyclictest0-21swapper/100:22:281
462099151,12cyclictest11-21rcuc/023:17:250
462099151,12cyclictest0-21swapper/022:40:000
462099150,13cyclictest20595-21diskmemload22:25:390
4623991411,2cyclictest3083-21kworker/u8:022:35:043
4623991411,2cyclictest1916-21kworker/u8:023:39:043
4623991411,2cyclictest16747-21kworker/u8:123:22:043
462399140,2cyclictest0-21swapper/320:45:173
462399140,2cyclictest0-21swapper/320:05:173
462399140,12cyclictest0-21swapper/323:08:073
4622991411,2cyclictest9372-21kworker/u8:221:03:042
4622991411,2cyclictest6356-21kworker/u8:120:42:032
4622991411,2cyclictest4532-21kworker/u8:219:20:042
4622991411,2cyclictest25163-21kworker/u8:020:05:042
4622991411,2cyclictest24439-21kworker/u8:000:02:042
4622991411,2cyclictest19515-21kworker/u8:222:57:032
4622991411,2cyclictest18016-21kworker/u8:200:32:012
4622991411,2cyclictest16747-21kworker/u8:123:27:042
4622991411,2cyclictest13814-21kworker/u8:021:19:042
4622991411,2cyclictest13403-21kworker/u8:123:53:042
4622991411,2cyclictest12982-21kworker/u8:119:52:042
4622991411,2cyclictest12982-21kworker/u8:119:38:012
4622991411,2cyclictest12808-21kworker/u8:021:40:042
4622991411,2cyclictest0-21swapper/223:34:522
4622991411,2cyclictest0-21swapper/221:35:322
462299140,2cyclictest0-21swapper/223:16:522
462299140,12cyclictest0-21swapper/222:52:142
462299140,12cyclictest0-21swapper/200:16:002
462199143,9cyclictest0-21swapper/121:16:031
462199143,9cyclictest0-21swapper/119:56:021
462199143,9cyclictest0-21swapper/119:56:021
462199142,10cyclictest0-21swapper/122:30:191
462199142,10cyclictest0-21swapper/100:15:381
4621991411,2cyclictest221ktimersoftd/123:00:471
462199141,12cyclictest221ktimersoftd/121:20:281
462199141,11cyclictest0-21swapper/121:27:271
4621991410,2cyclictest0-21swapper/123:35:121
462199140,13cyclictest21-21rcuc/122:04:581
462199140,13cyclictest0-21swapper/123:05:181
462199140,13cyclictest0-21swapper/100:25:581
462199140,12cyclictest20595-21diskmemload22:20:001
462199140,12cyclictest0-21swapper/123:15:151
462199140,12cyclictest0-21swapper/119:31:011
462199140,11cyclictest23-21ksoftirqd/121:59:081
462099142,10cyclictest11-21rcuc/023:26:480
4620991411,2cyclictest9-21ksoftirqd/021:45:030
4620991411,2cyclictest11-21rcuc/023:48:370
462099141,11cyclictest0-21swapper/000:10:020
4620991410,2cyclictest0-21swapper/019:15:170
462099140,2cyclictest101ktimersoftd/023:30:140
462099140,13cyclictest0-21swapper/022:50:290
462099140,12cyclictest0-21swapper/022:40:260
243522141,3sleep324362-21ssh23:27:223
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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