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2026-07-12 - 22:14

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 Jul 12, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3909210188,9sleep20-21swapper/207:06:062
413729272,15sleep00-21swapper/007:09:010
419028661,9sleep30-21swapper/307:09:443
420028059,6sleep10-21swapper/107:09:501
176162550,0sleep10-21swapper/111:37:031
430899290,3cyclictest29473-21diskmemload11:45:233
430599280,28cyclictest0-21swapper/212:01:422
430899274,22cyclictest29473-21diskmemload10:50:123
430899270,26cyclictest0-21swapper/312:20:143
430899270,26cyclictest0-21swapper/312:13:523
4303992712,6cyclictest25-21ksoftirqd/110:28:211
430899262,21cyclictest0-21swapper/310:46:363
430899262,21cyclictest0-21swapper/310:46:353
430399261,24cyclictest0-21swapper/110:18:321
430899251,22cyclictest29473-21diskmemload12:02:323
430399252,22cyclictest29473-21diskmemload10:08:051
430899248,14cyclictest3833-21apache211:22:403
430899243,20cyclictest29473-21diskmemload10:08:413
430899243,20cyclictest19442-21lockfile-create11:00:013
430899240,17cyclictest0-21swapper/312:16:073
430599240,24cyclictest0-21swapper/209:18:002
4303992412,4cyclictest38150irq/131-snd_hda11:16:481
430899231,20cyclictest29473-21diskmemload11:06:553
430899230,3cyclictest0-21swapper/311:00:133
430899230,22cyclictest0-21swapper/311:26:193
430899230,1cyclictest0-21swapper/312:35:193
430899230,1cyclictest0-21swapper/310:39:153
430899230,1cyclictest0-21swapper/310:22:043
430899230,1cyclictest0-21swapper/309:42:043
430899230,19cyclictest29473-21diskmemload12:32:363
430899230,16cyclictest0-21swapper/311:40:033
430599230,0cyclictest0-21swapper/211:34:222
430899223,16cyclictest29473-21diskmemload11:35:263
430899221,20cyclictest29473-21diskmemload09:16:193
430899221,19cyclictest0-21swapper/309:35:133
430899220,22cyclictest0-21swapper/310:13:283
430899220,21cyclictest0-21swapper/312:05:273
430899220,1cyclictest0-21swapper/310:41:263
430899220,1cyclictest0-21swapper/309:55:043
430899220,1cyclictest0-21swapper/309:45:543
430899220,17cyclictest225-21systemd-journal10:34:593
430599220,22cyclictest0-21swapper/212:37:432
430599220,19cyclictest0-21swapper/211:40:422
430399220,20cyclictest0-21swapper/110:20:171
4308992110,10cyclictest29473-21diskmemload09:29:573
4308992110,10cyclictest29473-21diskmemload09:29:563
430899210,3cyclictest0-21swapper/309:11:403
430899210,20cyclictest4978-21rm11:10:163
430899210,1cyclictest0-21swapper/309:32:123
430899210,18cyclictest0-21swapper/311:30:143
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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