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2026-06-21 - 20:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack7slot7s.osadl.org (updated Sun Jun 21, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
570629380,9sleep00-21swapper/007:09:510
543728666,9sleep20-21swapper/207:06:242
559428269,9sleep30-21swapper/307:08:263
563728164,13sleep10-21swapper/107:09:001
5808992924,3cyclictest27952-21cron10:25:002
580899280,24cyclictest0-21swapper/209:46:002
580899260,25cyclictest0-21swapper/212:35:012
580499250,25cyclictest0-21swapper/110:23:221
580899240,23cyclictest0-21swapper/212:10:542
580899240,23cyclictest0-21swapper/211:19:502
580499240,22cyclictest0-21swapper/112:25:271
293422230,0sleep10-21swapper/110:05:291
5808992221,0cyclictest0-21swapper/208:05:142
5808992219,2cyclictest1853-21munin-run12:04:592
5808992119,1cyclictest0-21swapper/211:00:132
580499212,12cyclictest0-21swapper/111:11:021
580499210,1cyclictest0-21swapper/110:44:191
580099215,11cyclictest0-21swapper/011:05:130
581099200,0cyclictest0-21swapper/310:01:513
580499200,20cyclictest0-21swapper/112:07:151
5800992019,1cyclictest13-21ksoftirqd/011:20:040
580899190,19cyclictest0-21swapper/211:50:522
580899190,18cyclictest0-21swapper/211:09:332
5804991916,2cyclictest0-21swapper/112:37:361
580499190,1cyclictest0-21swapper/110:31:391
580499190,18cyclictest0-21swapper/110:45:281
580499190,18cyclictest0-21swapper/109:50:571
580499190,0cyclictest0-21swapper/111:56:091
581099180,17cyclictest3076-21ssh10:10:053
5808991817,1cyclictest0-21swapper/210:30:552
581099176,1cyclictest141rcu_preempt12:28:313
581099170,16cyclictest0-21swapper/311:22:103
580899172,0cyclictest3619-21strings12:05:212
580899170,17cyclictest0-21swapper/210:47:212
580499178,5cyclictest38150irq/131-snd_hda09:49:081
5804991717,0cyclictest0-21swapper/111:08:551
5804991713,3cyclictest0-21swapper/111:44:371
580499171,15cyclictest31021-21diskmemload10:52:521
580499170,1cyclictest0-21swapper/110:13:531
5800991716,1cyclictest0-21swapper/009:21:440
5810991615,1cyclictest0-21swapper/311:01:323
580899160,1cyclictest0-21swapper/210:40:222
580899160,16cyclictest0-21swapper/209:55:572
5804991615,1cyclictest0-21swapper/109:55:121
5804991613,2cyclictest0-21swapper/111:54:401
5804991612,3cyclictest27667-21cron07:55:001
580499160,16cyclictest0-21swapper/111:22:141
580499160,16cyclictest0-21swapper/110:39:261
580499160,16cyclictest0-21swapper/109:36:531
580099160,15cyclictest0-21swapper/012:07:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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