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2026-03-13 - 05:39

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #4

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 50 highest latencies:
System rack9slot4s (updated Fri Mar 13, 2026 00:59:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
233969910881069,16cyclictest16235-21kworker/1:319:26:301
229892612564,32sleep00-21swapper/019:21:200
232602510416,31sleep10-21swapper/119:24:091
937421020,3sleep10-21swapper/100:40:291
191422940,10sleep02339599cyclictest23:44:400
155992860,8sleep12339699cyclictest20:25:311
23395998374,6cyclictest0-21swapper/019:26:300
236012750,4sleep023603-21cstates21:35:110
31052570,4sleep1201rcuc/100:00:301
111212512,4sleep011194-21ssh23:35:280
23396994418,11cyclictest22-21ksoftirqd/121:50:141
23396994417,6cyclictest22-21ksoftirqd/122:22:481
23396994316,7cyclictest22-21ksoftirqd/123:12:041
23396994216,6cyclictest22-21ksoftirqd/123:43:331
23396994216,16cyclictest22-21ksoftirqd/123:59:211
23396994216,10cyclictest22-21ksoftirqd/123:50:121
23396994215,7cyclictest22-21ksoftirqd/123:10:001
23396994210,8cyclictest24481-21latency20:50:221
23396994116,6cyclictest22-21ksoftirqd/122:49:561
23396994116,15cyclictest22-21ksoftirqd/121:34:551
23396994116,15cyclictest22-21ksoftirqd/121:29:311
23396994115,15cyclictest22-21ksoftirqd/121:37:241
2339599418,20cyclictest7398-21rm22:58:500
23395994126,11cyclictest2645-21snmpd22:23:040
124332411,8sleep00-21swapper/021:56:220
23396994015,10cyclictest22-21ksoftirqd/121:15:281
2339599403,18cyclictest0-21swapper/023:02:580
2339599402,19cyclictest31803-21diskstats21:10:150
2339699397,3cyclictest0-21swapper/123:22:151
2339699396,29cyclictest0-21swapper/122:56:561
2339699394,17cyclictest16424-21munin-run22:35:001
23396993917,7cyclictest22-21ksoftirqd/123:36:531
23396993917,7cyclictest22-21ksoftirqd/100:13:221
2339599396,30cyclictest11562-21cron22:30:000
2339599392,22cyclictest0-21swapper/022:37:420
2339599392,16cyclictest0-21swapper/022:50:370
2339599392,15cyclictest21810-21/usr/sbin/munin22:40:130
2339599392,15cyclictest21810-21/usr/sbin/munin22:40:120
23395993911,6cyclictest26734-21ssh00:25:240
23396993812,7cyclictest22-21ksoftirqd/100:16:101
2339599381,25cyclictest6249-21sh00:04:470
2339699378,8cyclictest2206-21dbus-daemon00:05:531
23396993718,6cyclictest22-21ksoftirqd/122:25:181
23396993717,6cyclictest22-21ksoftirqd/122:39:351
23396993717,6cyclictest22-21ksoftirqd/122:00:061
23396993716,6cyclictest22-21ksoftirqd/100:22:131
2339599372,13cyclictest19205-21iostat21:30:200
2339599371,15cyclictest25617-21ssh23:50:280
2339599371,12cyclictest12033-21ssh21:22:590
2339699367,18cyclictest0-21swapper/121:23:201
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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