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2026-08-20 - 23:31

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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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 50 highest latencies:
System rack1slot6s.osadl.org (updated Thu Aug 20, 2026 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2194991020,5rtkit-daemon2193-21rtkit-daemon07:51:471
12369991024,89cyclictest0-21swapper/110:36:351
1236999984,85cyclictest0-21swapper/108:29:141
1236999983,45cyclictest8880-21yum-updatesd-he09:33:111
12370999719,8cyclictest31514-21ssh10:06:562
12370999719,8cyclictest31514-21ssh10:06:562
1236999974,46cyclictest0-21swapper/110:48:061
1236999963,41cyclictest0-21swapper/108:03:471
1236999963,41cyclictest0-21swapper/108:03:471
12370999550,38cyclictest0-21swapper/211:06:372
12370999539,50cyclictest0-21swapper/210:41:462
1236999954,44cyclictest0-21swapper/109:07:501
1237099946,26cyclictest0-21swapper/208:26:252
1236999944,46cyclictest0-21swapper/109:04:311
1236999944,43cyclictest0-21swapper/110:35:181
1237099935,80cyclictest0-21swapper/210:16:552
12369999327,14cyclictest0-21swapper/111:06:291
1237099924,37cyclictest0-21swapper/209:09:492
12369999230,12cyclictest10353-21cpuspeed_turbos09:36:351
1237099914,27cyclictest0-21swapper/210:46:422
1236999914,29cyclictest0-21swapper/108:11:561
1237099904,9cyclictest1227-21runrttasks08:37:272
1237099904,27cyclictest0-21swapper/208:26:412
1237099904,24cyclictest16772-21tune2fs08:56:422
12370999038,46cyclictest0-21swapper/208:05:392
12370999038,46cyclictest0-21swapper/208:05:392
12370999035,47cyclictest22904-21grep06:11:472
12370999027,14cyclictest0-21swapper/210:56:502
1237099895,25cyclictest0-21swapper/207:59:112
1237099894,76cyclictest0-21swapper/209:19:052
1237099894,37cyclictest0-21swapper/209:11:512
1237099894,33cyclictest0-21swapper/210:30:032
1237099894,14cyclictest0-21swapper/210:11:542
12370998937,46cyclictest0-21swapper/209:45:142
1236999897,22cyclictest0-21swapper/108:06:261
1236999895,13cyclictest0-21swapper/109:26:451
1236999895,13cyclictest0-21swapper/109:26:451
1236999894,48cyclictest0-21swapper/108:24:181
1236999894,42cyclictest0-21swapper/108:32:431
1236999894,29cyclictest0-21swapper/107:16:521
1237099885,32cyclictest13852-21munin-node10:31:342
1237099884,34cyclictest0-21swapper/209:46:342
1237099884,27cyclictest0-21swapper/208:11:452
1237099884,13cyclictest0-21swapper/207:18:222
1237099884,12cyclictest0-21swapper/210:21:312
1237099883,21cyclictest5295-21ssh09:26:572
1237099883,21cyclictest5295-21ssh09:26:572
12370998818,12cyclictest0-21swapper/209:56:312
1236999885,30cyclictest0-21swapper/110:11:461
1236999884,28cyclictest9530-21sort07:56:461
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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