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2026-07-07 - 14:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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 rack7slot7s.osadl.org (updated Tue Jul 07, 2026 00:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1471829483,6sleep00-21swapper/019:06:050
1490829278,10sleep30-21swapper/319:08:343
1481929274,13sleep10-21swapper/119:07:231
1477128977,8sleep20-21swapper/219:06:482
1510899300,15cyclictest0-21swapper/223:15:442
1510499300,1cyclictest0-21swapper/122:25:271
1510499280,3cyclictest29596-21ssh22:40:211
1510499271,25cyclictest5940-21diskmemload23:52:541
1510499270,3cyclictest18086-21cron22:15:001
1510499261,4cyclictest0-21swapper/123:45:151
15108992524,1cyclictest0-21swapper/222:47:172
1510499259,3cyclictest38150irq/131-snd_hda00:05:201
1510499252,2cyclictest17405-21apache_processe21:55:131
1510499252,2cyclictest17405-21apache_processe21:55:131
1510499251,21cyclictest29195-21grep19:40:191
1510499241,4cyclictest0-21swapper/100:15:201
1509899245,3cyclictest225-21systemd-journal22:00:420
1510499233,19cyclictest1678-21proc_pri19:50:211
1510499232,2cyclictest5940-21diskmemload22:21:381
1510499231,3cyclictest7900-21ssh23:25:201
1510499230,18cyclictest0-21swapper/121:45:131
1510499223,15cyclictest38150irq/131-snd_hda19:45:111
15104992222,0cyclictest0-21swapper/123:04:361
1510499221,20cyclictest0-21swapper/121:15:151
1510499220,2cyclictest5940-21diskmemload22:35:251
1510499220,1cyclictest0-21swapper/119:35:131
1510899210,21cyclictest0-21swapper/200:39:102
1510899210,13cyclictest0-21swapper/200:20:482
1510499212,1cyclictest9204-21ntp_states21:30:231
1510499212,1cyclictest5940-21diskmemload00:37:091
1510499211,5cyclictest5940-21diskmemload23:10:201
1510499211,4cyclictest5940-21diskmemload23:40:051
1510499210,4cyclictest29625-21sh22:01:511
1510499210,20cyclictest0-21swapper/123:30:151
1510499210,20cyclictest0-21swapper/123:30:151
1510499210,1cyclictest0-21swapper/100:27:061
1509899217,8cyclictest13954-21-browsed00:07:070
15098992120,1cyclictest0-21swapper/023:51:290
1510899201,18cyclictest21349-21ps00:30:242
1510499207,5cyclictest11062-21sh23:08:061
1510499203,16cyclictest0-21swapper/123:55:231
1510499202,4cyclictest24146-21/usr/sbin/munin21:20:171
1510499201,5cyclictest20704-21runrttasks00:30:191
1510499201,4cyclictest0-21swapper/119:20:281
1510499200,20cyclictest0-21swapper/122:56:561
1511299190,19cyclictest0-21swapper/323:28:453
1511299190,17cyclictest0-21swapper/300:29:033
1510899190,12cyclictest0-21swapper/221:37:262
15104991919,0cyclictest0-21swapper/100:13:281
15104991915,2cyclictest0-21swapper/121:15:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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