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2026-05-03 - 09:11

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 May 03, 2026 00:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1448829876,16sleep00-21swapper/019:05:250
1494929280,8sleep20-21swapper/219:06:262
1492128963,15sleep10-21swapper/119:06:051
1519928863,9sleep30-21swapper/319:09:413
1531899280,3cyclictest0-21swapper/322:01:493
1531899260,25cyclictest0-21swapper/300:15:173
1531899240,5cyclictest0-21swapper/322:40:123
1531399240,23cyclictest0-21swapper/122:50:471
15318992321,1cyclictest477-21rs:main3
1531899230,21cyclictest0-21swapper/322:58:523
1531799230,1cyclictest0-21swapper/222:46:042
15313992321,1cyclictest477-21rs:main1
1531899222,15cyclictest0-21swapper/322:45:463
15318992221,1cyclictest0-21swapper/323:47:183
15317992119,1cyclictest0-21swapper/221:36:102
15313992119,1cyclictest477-21rs:main1
15310992120,1cyclictest0-21swapper/020:30:130
1531899200,19cyclictest0-21swapper/323:51:313
15313992018,1cyclictest477-21rs:main1
1531899190,4cyclictest0-21swapper/321:14:163
1531899190,17cyclictest0-21swapper/300:04:003
15317991917,1cyclictest0-21swapper/219:55:132
1531799190,1cyclictest141rcu_preempt00:25:412
1531399190,1cyclictest0-21swapper/123:17:481
15310991918,1cyclictest0-21swapper/021:21:340
1531099190,19cyclictest0-21swapper/023:09:480
1531899180,1cyclictest0-21swapper/323:14:353
15317991816,1cyclictest8329-21diskmemload00:35:062
1531799180,1cyclictest0-21swapper/221:10:222
1531799180,18cyclictest0-21swapper/223:48:262
15313991817,1cyclictest8329-21diskmemload23:59:141
15318991715,2cyclictest0-21swapper/321:26:443
1531799179,5cyclictest475-21in:imuxsock22:30:002
15317991716,1cyclictest0-21swapper/200:06:122
1531799170,10cyclictest0-21swapper/222:00:012
15313991717,0cyclictest0-21swapper/123:34:581
15313991712,4cyclictest38150irq/131-snd_hda00:40:001
1531399171,1cyclictest141rcu_preempt22:35:051
1531399171,15cyclictest8329-21diskmemload21:43:131
1531899164,7cyclictest12107-21ssh22:10:133
15318991611,4cyclictest39-21ksoftirqd/320:05:223
1531899161,13cyclictest0-21swapper/321:20:123
15317991615,1cyclictest0-21swapper/223:25:122
1531399160,15cyclictest0-21swapper/123:23:591
1531399160,0cyclictest0-21swapper/122:14:171
1531099162,4cyclictest5406-21df_abs22:25:140
1531899154,6cyclictest11575-21munin-run22:10:003
15318991514,1cyclictest0-21swapper/321:35:183
15317991511,4cyclictest5047-21apache223:16:552
15317991511,1cyclictest0-21swapper/200:22:292
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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