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2026-08-20 - 09:04

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, 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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  Intel
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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 rack1slot6s.osadl.org (updated Thu Aug 20, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2881991024,60cyclictest27798-21grep22:17:072
288199983,73cyclictest20577-21rm22:56:102
288199964,52cyclictest0-21swapper/221:37:252
288199944,46cyclictest0-21swapper/220:07:142
288199944,46cyclictest0-21swapper/219:37:102
288199934,68cyclictest0-21swapper/221:12:052
288199934,65cyclictest0-21swapper/222:32:132
288199934,65cyclictest0-21swapper/222:32:132
288199933,72cyclictest0-21swapper/221:22:122
288199924,67cyclictest0-21swapper/220:45:282
288199914,65cyclictest0-21swapper/221:07:112
288199914,65cyclictest0-21swapper/221:07:112
219499910,5rtkit-daemon2193-21rtkit-daemon23:14:053
219499910,5rtkit-daemon2193-21rtkit-daemon23:14:053
288199904,79cyclictest1577-21timerandwakeup20:47:252
288199904,65cyclictest0-21swapper/221:33:572
288199904,63cyclictest0-21swapper/221:52:002
288199904,62cyclictest18429-21ntpq22:02:152
288199895,60cyclictest0-21swapper/221:57:092
288199894,78cyclictest0-21swapper/223:00:042
288199894,77cyclictest22675-21cpu20:32:062
288199894,67cyclictest0-21swapper/222:48:582
288199894,66cyclictest0-21swapper/220:04:562
288199885,76cyclictest0-21swapper/223:17:142
288199885,64cyclictest0-21swapper/218:32:072
288199885,61cyclictest0-21swapper/222:37:052
288199884,78cyclictest0-21swapper/222:06:532
288199884,78cyclictest0-21swapper/220:22:052
288199884,78cyclictest0-21swapper/218:17:092
288199884,77cyclictest0-21swapper/219:54:572
288199884,67cyclictest0-21swapper/222:12:002
288199884,56cyclictest0-21swapper/223:01:582
288199875,60cyclictest0-21swapper/221:49:472
288199875,60cyclictest0-21swapper/221:49:472
288199874,76cyclictest31038-21fschecks_time22:22:082
288199874,75cyclictest0-21swapper/221:42:062
288199874,66cyclictest0-21swapper/220:37:262
288199873,50cyclictest0-21swapper/222:29:162
288199864,62cyclictest0-21swapper/221:29:582
288199864,58cyclictest0-21swapper/220:27:082
288199864,58cyclictest0-21swapper/220:27:082
2881998613,52cyclictest20773-21ssh21:17:132
288199859,55cyclictest0-21swapper/221:04:002
288199845,57cyclictest0-21swapper/223:07:172
288199844,73cyclictest0-21swapper/220:12:152
288199844,59cyclictest0-21swapper/223:14:572
288199844,59cyclictest0-21swapper/223:14:572
2881998419,39cyclictest0-21swapper/219:44:452
288199835,53cyclictest20929-21sshd18:27:202
288199835,50cyclictest0-21swapper/222:42:142
288199835,45cyclictest0-21swapper/219:12:152
288199834,73cyclictest0-21swapper/220:57:202
288199834,71cyclictest0-21swapper/218:22:132
288199834,58cyclictest0-21swapper/220:52:272
288199834,52cyclictest0-21swapper/220:17:262
288199833,52cyclictest0-21swapper/219:57:282
288199825,52cyclictest0-21swapper/217:53:492
288199824,70cyclictest0-21swapper/218:07:092
288199824,55cyclictest0-21swapper/218:02:102
288199814,68cyclictest0-21swapper/217:57:322
288199804,71cyclictest0-21swapper/219:22:082
288199804,48cyclictest0-21swapper/218:12:072
288199804,46cyclictest0-21swapper/219:28:462
219499800,5rtkit-daemon2193-21rtkit-daemon19:55:363
288199793,69cyclictest20461-21yum-updatesd-he19:33:442
288199788,55cyclictest107550irq/46-eth019:51:542
288199784,67cyclictest0-21swapper/219:06:562
288199784,67cyclictest0-21swapper/219:06:562
288199784,65cyclictest1227-21runrttasks19:07:092
219499780,4rtkit-daemon2193-21rtkit-daemon20:21:123
288199774,66cyclictest0-21swapper/218:42:302
288199773,66cyclictest0-21swapper/218:47:102
288199764,65cyclictest0-21swapper/218:52:082
288199764,64cyclictest0-21swapper/218:39:032
288199754,64cyclictest0-21swapper/218:57:202
288199754,63cyclictest0-21swapper/219:17:182
287499734,61cyclictest0-21swapper/020:27:210
287499734,61cyclictest0-21swapper/020:27:210
6802695,53sleep0858-21cut17:47:190
288199694,57cyclictest0-21swapper/217:51:592
2874996725,33cyclictest26364-21munin-node21:27:180
287499667,51cyclictest0-21swapper/020:57:250
287499666,52cyclictest0-21swapper/022:32:100
287499666,52cyclictest0-21swapper/022:32:100
287499664,54cyclictest0-21swapper/021:07:040
287499664,54cyclictest0-21swapper/021:07:040
287499664,53cyclictest0-21swapper/022:26:480
287499656,50cyclictest0-21swapper/019:52:070
287499653,56cyclictest0-21swapper/022:11:590
2874996517,28cyclictest11241-21fschecks_time21:52:070
287499644,52cyclictest0-21swapper/020:37:250
287499644,52cyclictest0-21swapper/020:02:300
287499643,53cyclictest0-21swapper/022:39:520
287499643,52cyclictest0-21swapper/022:01:090
2874996412,29cyclictest0-21swapper/022:08:010
2882996341,15cyclictest0-21swapper/318:01:583
2882996341,14cyclictest0-21swapper/322:11:583
288299634,31cyclictest0-21swapper/323:02:123
2880996319,30cyclictest0-21swapper/120:45:531
287499634,51cyclictest0-21swapper/023:21:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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