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2026-06-02 - 14:36

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 Tue Jun 02, 2026 12:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
35912239162,24sleep20-21swapper/207:09:332
35272202164,26sleep00-21swapper/007:08:430
34232202166,24sleep10-21swapper/107:07:231
33802201164,24sleep30-21swapper/307:06:483
404821560,5sleep3372699cyclictest10:50:013
2749221270,2sleep2371999cyclictest11:40:252
3719999491,2cyclictest0-21swapper/212:27:502
3719998884,3cyclictest0-21swapper/207:51:182
275652570,5sleep1371499cyclictest10:29:491
275652570,5sleep1371499cyclictest10:29:491
69822510,2sleep00-21swapper/010:55:160
219982470,4sleep341-21ksoftirqd/310:15:173
208832440,2sleep20-21swapper/211:25:242
192242440,1sleep20-21swapper/212:35:222
371499391,11cyclictest0-21swapper/111:42:511
278822320,1sleep30-21swapper/310:30:103
371999311,10cyclictest0-21swapper/210:31:312
371499317,10cyclictest0-21swapper/111:25:241
371999307,3cyclictest0-21swapper/209:17:102
371999307,3cyclictest0-21swapper/209:17:102
371499302,22cyclictest0-21swapper/110:34:361
3714993015,3cyclictest10684-21ntp_states08:35:221
371499292,17cyclictest87650irq/129-enp1s0-11:07:291
3714992914,9cyclictest0-21swapper/107:46:571
38492280,4sleep1221ktimersoftd/112:00:221
3714992814,9cyclictest0-21swapper/109:14:321
371499280,13cyclictest23-21ksoftirqd/111:00:551
370599282,17cyclictest19184-21kworker/0:111:35:190
370599282,17cyclictest19184-21kworker/0:111:35:190
370599281,16cyclictest877-21kworker/0:109:36:440
371499271,21cyclictest0-21swapper/109:26:141
371499270,22cyclictest0-21swapper/107:42:471
370599272,10cyclictest10480-21kworker/0:211:10:230
371999266,10cyclictest26670-21/usr/sbin/munin10:25:212
371999266,10cyclictest26670-21/usr/sbin/munin10:25:212
371999264,9cyclictest0-21swapper/212:31:272
371499264,6cyclictest0-21swapper/111:38:261
371499264,6cyclictest0-21swapper/111:38:261
371499262,15cyclictest0-21swapper/112:37:221
371499261,9cyclictest0-21swapper/111:11:251
3714992613,3cyclictest0-21swapper/109:09:341
371499261,16cyclictest0-21swapper/111:52:151
371499261,16cyclictest0-21swapper/110:10:291
371499261,16cyclictest0-21swapper/110:01:421
370599262,9cyclictest25795-21kworker/0:011:45:160
370599262,14cyclictest2668-40dnf09:30:220
85482250,4sleep230-21rcuc/209:45:152
372699258,3cyclictest0-21swapper/309:06:083
371999256,9cyclictest6978-21latency_hist12:10:012
371499253,3cyclictest0-21swapper/110:20:391
371499252,11cyclictest20733-21cpuspeed_turbos09:00:131
371499251,4cyclictest14910-21kworker/u8:211:17:131
371499251,15cyclictest0-21swapper/109:32:301
371499251,15cyclictest0-21swapper/108:59:351
371499251,15cyclictest0-21swapper/108:20:471
371499251,15cyclictest0-21swapper/107:35:121
371499251,12cyclictest23208-21awk10:20:011
371499251,12cyclictest13736-21df07:30:121
371499250,9cyclictest5510-21kworker/u8:110:07:201
371499250,16cyclictest0-21swapper/108:18:561
370599252,9cyclictest11091-21kworker/0:112:30:280
370599250,12cyclictest6241-21awk10:55:020
370599250,11cyclictest0-21swapper/008:45:010
372699248,8cyclictest0-21swapper/308:20:283
371499248,3cyclictest0-21swapper/108:15:011
371499245,9cyclictest28186-21sshd08:00:281
371499241,8cyclictest0-21swapper/112:11:221
371499241,8cyclictest0-21swapper/109:40:191
3714992413,3cyclictest0-21swapper/107:11:081
3714992412,6cyclictest0-21swapper/112:23:371
371499241,15cyclictest0-21swapper/111:56:351
371499241,15cyclictest0-21swapper/111:31:441
371499241,15cyclictest0-21swapper/110:41:351
371499241,15cyclictest0-21swapper/109:51:151
371499241,15cyclictest0-21swapper/109:20:141
371499241,15cyclictest0-21swapper/108:53:001
371499241,15cyclictest0-21swapper/107:26:321
371499241,15cyclictest0-21swapper/107:23:421
371499241,11cyclictest9390-21munin-run08:35:021
371499241,11cyclictest27555-21diskstats09:15:151
371499241,11cyclictest27555-21diskstats09:15:151
371499241,11cyclictest15469-21sed08:45:261
371499241,11cyclictest14732-21ntp_states12:25:191
371499240,17cyclictest0-21swapper/111:47:231
371499240,16cyclictest0-21swapper/112:15:191
371499240,16cyclictest0-21swapper/111:20:111
371499240,16cyclictest0-21swapper/110:35:561
370599241,8cyclictest15833-21kworker/0:208:50:270
370599241,8cyclictest10480-21kworker/0:211:23:430
370599241,12cyclictest31387-21basename09:25:000
370599241,10cyclictest8178-21kworker/0:011:02:390
211292240,3sleep341-21ksoftirqd/307:45:213
372699231,11cyclictest0-21swapper/310:35:243
371999232,11cyclictest4711-21ntp_states09:35:212
371999231,11cyclictest0-21swapper/208:20:462
371499233,8cyclictest0-21swapper/109:35:151
3714992312,3cyclictest0-21swapper/110:48:441
371499231,15cyclictest0-21swapper/110:56:331
371499231,14cyclictest0-21swapper/108:44:391
371499231,14cyclictest0-21swapper/107:51:091
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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