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2026-09-01 - 11:57

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 Tue Sep 01, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
278221470,5sleep2821999cyclictest21:54:452
6409210886,15sleep20-21swapper/219:05:132
7410210785,16sleep10-21swapper/119:05:241
7460210684,16sleep00-21swapper/019:05:510
8166210594,6sleep30-21swapper/319:09:463
252272800,0sleep30-21swapper/323:24:093
171672750,1sleep30-21swapper/322:41:363
281132740,0sleep00-21swapper/000:35:130
281132740,0sleep00-21swapper/000:35:130
230022730,0sleep20-21swapper/222:48:082
153092520,1sleep10-21swapper/121:33:561
8220992522,2cyclictest10569-21kworker/u8:223:42:043
8220992421,2cyclictest8775-21kworker/u8:200:22:043
8220992421,2cyclictest31149-21kworker/u8:221:18:043
8219992320,2cyclictest4404-21kworker/u8:121:24:012
8219992320,2cyclictest32471-21kworker/u8:222:50:012
8219992320,2cyclictest32471-21kworker/u8:222:27:042
8220992219,2cyclictest32471-21kworker/u8:222:48:043
8220992219,2cyclictest27064-21kworker/u8:022:22:043
8220992219,2cyclictest17448-21kworker/u8:100:09:043
822099220,6cyclictest0-21swapper/322:01:043
822099220,18cyclictest0-21swapper/323:46:043
8214992219,2cyclictest32471-21kworker/u8:222:58:040
8220992118,2cyclictest6288-21kworker/u8:022:32:053
8220992118,2cyclictest32471-21kworker/u8:222:57:043
8220992118,2cyclictest24459-21kworker/u8:021:41:043
822099210,19cyclictest0-21swapper/321:37:043
822099210,18cyclictest0-21swapper/323:15:043
822099210,16cyclictest0-21swapper/323:38:053
8219992118,2cyclictest6656-21kworker/u8:222:12:052
8219992118,2cyclictest6288-21kworker/u8:022:38:012
8219992118,2cyclictest32471-21kworker/u8:223:00:042
8219992118,2cyclictest28180-21kworker/u8:200:38:042
8219992118,2cyclictest28180-21kworker/u8:200:38:042
8219992118,2cyclictest21351-21kworker/u8:223:23:042
8219992118,2cyclictest20063-21kworker/u8:121:47:042
8219992118,2cyclictest20063-21kworker/u8:121:44:012
8219992118,2cyclictest11581-21kworker/u8:221:31:042
8214992118,2cyclictest4404-21kworker/u8:121:27:040
242732210,1sleep0101ktimersoftd/021:10:060
242732210,1sleep0101ktimersoftd/021:10:060
225032210,1sleep1221ktimersoftd/119:45:131
123502210,1sleep337-21rcuc/300:18:443
8220992017,2cyclictest9640-21kworker/u8:223:08:043
8220992017,2cyclictest6656-21kworker/u8:222:19:043
8220992017,2cyclictest4404-21kworker/u8:121:28:043
8220992017,2cyclictest17448-21kworker/u8:123:59:043
8220992017,2cyclictest1674-21kworker/u8:123:02:053
8220992017,2cyclictest15955-21kworker/u8:023:50:043
822099200,15cyclictest0-21swapper/319:47:043
8219992017,2cyclictest6288-21kworker/u8:022:32:012
8219992017,2cyclictest27326-21kworker/u8:123:36:042
8219992017,2cyclictest17448-21kworker/u8:100:23:042
8219992017,2cyclictest1674-21kworker/u8:123:16:052
8219992017,2cyclictest1674-21kworker/u8:123:12:042
821999200,2cyclictest0-21swapper/222:58:042
8214992017,2cyclictest32471-21kworker/u8:222:50:050
8220991916,2cyclictest995-21kworker/u8:021:57:043
8220991916,2cyclictest6656-21kworker/u8:222:13:043
8220991916,2cyclictest17764-21kworker/u8:122:51:043
822099190,2cyclictest0-21swapper/322:28:043
822099190,2cyclictest0-21swapper/321:52:043
822099190,2cyclictest0-21swapper/300:02:043
822099190,18cyclictest0-21swapper/300:11:043
822099190,14cyclictest0-21swapper/321:12:043
822099190,14cyclictest0-21swapper/321:12:043
822099190,14cyclictest0-21swapper/320:17:043
8219991916,2cyclictest30304-21kworker/u8:120:08:042
8219991916,2cyclictest20063-21kworker/u8:121:39:042
8219991916,2cyclictest11947-21kworker/u8:122:04:042
8214991916,2cyclictest995-21kworker/u8:022:02:040
8214991916,2cyclictest9640-21kworker/u8:223:09:040
8214991916,2cyclictest17448-21kworker/u8:100:07:040
8214991916,2cyclictest15955-21kworker/u8:023:21:040
8214991916,2cyclictest11947-21kworker/u8:122:06:040
8220991815,2cyclictest6288-21kworker/u8:022:37:043
8220991815,2cyclictest30304-21kworker/u8:120:26:013
8220991815,2cyclictest27326-21kworker/u8:123:29:043
8220991815,2cyclictest17448-21kworker/u8:100:28:013
822099180,2cyclictest0-21swapper/319:17:043
822099180,17cyclictest0-21swapper/320:38:043
8219991815,2cyclictest32471-21kworker/u8:222:44:062
8219991815,2cyclictest17448-21kworker/u8:123:52:012
8219991815,2cyclictest10569-21kworker/u8:223:49:042
821999180,6cyclictest0-21swapper/221:27:042
8214991815,2cyclictest6288-21kworker/u8:022:42:040
8214991815,2cyclictest27326-21kworker/u8:123:26:040
8214991815,2cyclictest20063-21kworker/u8:121:50:040
821499180,2cyclictest0-21swapper/022:45:040
821499180,2cyclictest0-21swapper/022:28:040
821499180,2cyclictest0-21swapper/021:59:040
821499180,2cyclictest0-21swapper/000:17:040
821499180,2cyclictest0-21swapper/000:02:040
8220991714,2cyclictest31149-21kworker/u8:221:20:043
8220991714,2cyclictest30304-21kworker/u8:120:11:043
822099171,2cyclictest12845-21copy22:05:043
822099170,16cyclictest0-21swapper/319:27:043
822099170,13cyclictest0-21swapper/319:34:013
821999172,2cyclictest13052-21ssh22:05:042
8219991714,2cyclictest8563-21kworker/u8:219:23:042
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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