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2026-06-17 - 19:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 100 highest latencies:
System rack5slot3s.osadl.org (updated Wed Jun 17, 2026 12:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
48262237159,25sleep00-21swapper/007:08:120
47342230156,23sleep10-21swapper/107:07:001
46372230153,24sleep20-21swapper/207:05:432
48682202166,24sleep30-21swapper/307:08:393
2072521300,5sleep1506399cyclictest10:10:111
2072521300,5sleep1506399cyclictest10:10:111
155472580,3sleep0505799cyclictest11:10:230
67012550,4sleep2507099cyclictest10:50:212
291462530,4sleep081ktimersoftd/010:30:020
507599349,4cyclictest0-21swapper/310:40:243
507599349,3cyclictest87350irq/126-enp1s0-11:20:143
507599331,4cyclictest0-21swapper/312:08:173
507599321,12cyclictest22814-21sed07:45:253
507599301,11cyclictest808-21snmpd07:25:173
506399309,3cyclictest32677-21idleruntime11:50:161
507599291,13cyclictest0-21swapper/310:20:133
506399292,25cyclictest0-21swapper/110:09:571
506399291,26cyclictest0-21swapper/110:23:241
506399291,26cyclictest0-21swapper/108:32:331
507599281,5cyclictest30135-21users09:15:243
5075992811,3cyclictest6667-21ntpq10:50:213
5075992811,3cyclictest16189-21timerwakeupswit07:30:253
507099281,6cyclictest0-21swapper/210:25:072
506399280,5cyclictest0-21swapper/109:29:061
506399280,26cyclictest0-21swapper/110:28:351
505799281,25cyclictest0-21swapper/007:48:330
507599278,11cyclictest0-21swapper/310:14:473
507599278,11cyclictest0-21swapper/310:14:473
5075992714,8cyclictest0-21swapper/309:37:253
507599271,10cyclictest7817-21head09:40:133
5075992710,4cyclictest0-21swapper/309:30:113
507099271,5cyclictest6813-21kworker/u8:210:10:162
507099271,5cyclictest6813-21kworker/u8:210:10:162
506399271,4cyclictest3315-21head08:15:221
506399271,24cyclictest0-21swapper/111:36:481
506399271,24cyclictest0-21swapper/110:53:071
506399271,24cyclictest0-21swapper/109:34:351
506399271,24cyclictest0-21swapper/107:31:551
506399270,5cyclictest0-21swapper/109:16:041
506399270,25cyclictest0-21swapper/108:40:421
507599269,3cyclictest0-21swapper/312:11:233
5075992611,3cyclictest808-21snmpd08:41:193
507599261,12cyclictest0-21swapper/311:43:313
5075992611,2cyclictest0-21swapper/311:25:113
5075992610,3cyclictest0-21swapper/308:08:393
507599260,11cyclictest0-21swapper/310:08:553
507099266,11cyclictest20828-21sort12:35:262
507099266,11cyclictest20828-21sort12:35:262
507099261,6cyclictest0-21swapper/211:35:182
506399261,23cyclictest0-21swapper/112:39:561
506399261,23cyclictest0-21swapper/112:39:561
506399261,21cyclictest700-21irqstats08:10:191
506399260,5cyclictest0-21swapper/112:29:391
506399260,5cyclictest0-21swapper/110:19:401
506399260,5cyclictest0-21swapper/109:38:371
506399260,3cyclictest0-21swapper/109:56:081
506399260,24cyclictest0-21swapper/108:53:371
5057992612,9cyclictest0-21swapper/009:25:180
505799261,22cyclictest26536-21sshd07:55:170
505799261,12cyclictest4753-21munin-run09:35:000
505799260,23cyclictest18781-21grep10:05:160
507599251,13cyclictest0-21swapper/311:07:233
507599251,13cyclictest0-21swapper/310:55:333
507599251,13cyclictest0-21swapper/310:19:513
507599251,13cyclictest0-21swapper/309:56:273
507599251,13cyclictest0-21swapper/308:13:433
507599251,12cyclictest0-21swapper/311:46:033
507599251,12cyclictest0-21swapper/311:36:553
5075992510,3cyclictest0-21swapper/312:17:513
5075992510,2cyclictest0-21swapper/311:52:553
507599250,13cyclictest0-21swapper/312:04:593
507099251,2cyclictest0-21swapper/209:11:422
5070992511,3cyclictest827-21runrttasks10:17:502
5070992510,7cyclictest87650irq/129-enp1s0-11:23:542
506399251,22cyclictest0-21swapper/107:48:271
506399250,5cyclictest0-21swapper/112:32:591
506399250,5cyclictest0-21swapper/111:41:011
506399250,5cyclictest0-21swapper/111:06:361
506399250,5cyclictest0-21swapper/110:45:581
506399250,24cyclictest0-21swapper/107:20:361
506399250,18cyclictest0-21swapper/112:03:061
505799253,10cyclictest87550irq/128-enp1s0-12:36:290
505799253,10cyclictest87550irq/128-enp1s0-12:36:290
507599249,9cyclictest0-21swapper/311:55:073
507599249,9cyclictest0-21swapper/310:00:073
507599249,3cyclictest0-21swapper/309:06:193
507599249,3cyclictest0-21swapper/307:55:433
507599248,3cyclictest0-21swapper/310:32:433
507599248,10cyclictest0-21swapper/310:38:513
507599247,3cyclictest0-21swapper/309:20:513
507599247,3cyclictest0-21swapper/308:36:353
507599241,12cyclictest0-21swapper/312:37:273
507599241,12cyclictest0-21swapper/312:37:273
507599241,10cyclictest0-21swapper/312:27:073
5075992410,3cyclictest0-21swapper/308:15:553
507599240,10cyclictest0-21swapper/308:22:593
507099241,8cyclictest0-21swapper/209:16:592
507099241,6cyclictest0-21swapper/211:33:522
507099241,6cyclictest0-21swapper/211:15:052
507099241,3cyclictest0-21swapper/212:25:162
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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