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2026-07-22 - 09:09

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 Wed Jul 22, 2026 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
256489910135,58cyclictest0-21swapper/021:00:210
2564899995,13cyclictest27473-21yum-updatesd-he22:59:370
2564899974,26cyclictest0-21swapper/020:49:340
2564899965,82cyclictest0-21swapper/022:24:250
2564899959,25cyclictest0-21swapper/020:39:220
2564899955,27cyclictest0-21swapper/021:34:250
2564899954,34cyclictest23600-21kworker/0:222:09:060
2564899946,26cyclictest0-21swapper/021:59:180
2564899946,26cyclictest0-21swapper/021:59:180
2564899934,37cyclictest0-21swapper/023:44:310
2564899934,14cyclictest0-21swapper/022:16:170
2564899924,34cyclictest0-21swapper/021:49:290
2564899923,25cyclictest4053-21ssh20:44:310
2564899923,25cyclictest0-21swapper/022:19:360
2564899915,13cyclictest0-21swapper/021:14:400
2564899915,13cyclictest0-21swapper/021:14:400
2564899914,29cyclictest0-21swapper/023:09:270
2564899914,28cyclictest0-21swapper/018:44:430
2564899914,27cyclictest0-21swapper/023:06:470
2564899914,13cyclictest0-21swapper/020:54:310
2564899913,43cyclictest16596-21chrt22:41:400
2564899913,36cyclictest0-21swapper/023:34:020
25648999117,9cyclictest3450-21ssh21:34:070
2564899904,29cyclictest0-21swapper/021:04:440
2564899904,26cyclictest0-21swapper/023:28:330
2564899904,26cyclictest0-21swapper/023:28:330
2564899904,12cyclictest1227-21runrttasks20:31:010
25648999035,11cyclictest8790-21grep21:39:420
2564899903,32cyclictest0-21swapper/022:29:390
110992900,4sleep111100-21processes20:54:381
2564899895,34cyclictest0-21swapper/022:56:160
2564899894,26cyclictest0-21swapper/023:35:390
2564899894,26cyclictest0-21swapper/022:36:240
25648998918,12cyclictest0-21swapper/021:24:350
2564899885,24cyclictest0-21swapper/021:23:540
2564899885,23cyclictest4562-21fschecks_count23:14:210
2564899884,34cyclictest0-21swapper/020:34:400
2564899884,34cyclictest0-21swapper/020:34:400
2564899884,25cyclictest0-21swapper/021:48:170
2564899884,24cyclictest0-21swapper/021:54:310
2564899884,23cyclictest27818-21iostat22:09:290
2564899882,14cyclictest0-21swapper/023:39:250
2564899875,26cyclictest0-21swapper/021:13:130
2564899874,26cyclictest0-21swapper/020:04:250
2564899865,12cyclictest0-21swapper/019:59:260
2564899864,26cyclictest0-21swapper/020:23:590
25648998618,12cyclictest0-21swapper/020:27:310
2564899857,20cyclictest0-21swapper/019:29:130
2564899854,33cyclictest0-21swapper/019:49:400
2564899853,25cyclictest0-21swapper/022:44:100
2564899853,25cyclictest0-21swapper/022:44:100
2564899844,26cyclictest0-21swapper/023:22:400
2564899824,33cyclictest0-21swapper/018:27:310
2564899824,33cyclictest0-21swapper/018:27:310
2564899815,26cyclictest0-21swapper/019:26:110
2564899804,26cyclictest0-21swapper/022:49:140
2564899794,33cyclictest0-21swapper/018:34:440
2564899773,39cyclictest0-21swapper/019:38:510
299812740,5sleep229987-21entropy19:34:302
219499680,4rtkit-daemon2193-21rtkit-daemon21:54:223
25649996212,42cyclictest5703-21unixbench_multi23:14:371
25649996119,24cyclictest0-21swapper/121:59:361
25649996119,24cyclictest0-21swapper/121:59:361
25651996026,9cyclictest14171-21yum-updatesd-he20:59:413
25651996023,23cyclictest0-21swapper/321:16:123
25651996023,23cyclictest0-21swapper/321:16:123
25651996017,27cyclictest29169-21ssh22:11:413
2565099604,11cyclictest0-21swapper/221:59:402
2565099604,11cyclictest0-21swapper/221:59:402
2565099603,49cyclictest0-21swapper/221:34:222
64762593,48sleep20-21swapper/223:17:192
33072592,49sleep30-21swapper/321:33:353
2564999594,36cyclictest12681-21munin-node18:59:421
301152584,11sleep20-21swapper/220:34:412
301152584,11sleep20-21swapper/220:34:412
2565199584,36cyclictest0-21swapper/323:18:293
2565199584,36cyclictest0-21swapper/320:57:473
25651995825,14cyclictest25228-21unixbench_multi22:04:413
25650995841,10cyclictest27141-21grep22:09:212
2565099583,48cyclictest0-21swapper/222:34:282
2564999587,44cyclictest0-21swapper/121:09:361
219499580,6rtkit-daemon2193-21rtkit-daemon20:04:273
143852584,46sleep20-21swapper/223:29:202
87382574,12sleep20-21swapper/219:58:092
2565199574,35cyclictest0-21swapper/322:31:543
2565199573,34cyclictest0-21swapper/322:51:493
25651995718,24cyclictest14858-21kernelversion23:29:253
2564999574,23cyclictest29788-21tr21:24:211
25649995715,21cyclictest6088-21unixbench-2d22:24:411
25649995711,27cyclictest16930-21fschecks_count21:04:261
219499570,5rtkit-daemon2193-21rtkit-daemon19:04:513
198432574,12sleep20-21swapper/223:38:072
165002573,12sleep20-21swapper/222:41:192
315222563,10sleep30-21swapper/320:38:163
315222563,10sleep30-21swapper/320:38:163
2565199566,31cyclictest0-21swapper/323:02:133
2565199564,34cyclictest0-21swapper/322:54:223
25651995619,13cyclictest0-21swapper/321:49:353
25651995614,24cyclictest10299-21munin-node21:44:403
25650995638,11cyclictest10670-21cpuspeed_turbos21:44:222
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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