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2026-07-19 - 03:17

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 Sun Jul 19, 2026 00:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
97129379,9sleep00-21swapper/019:06:500
98329167,18sleep20-21swapper/219:07:002
87928966,18sleep10-21swapper/119:05:381
108728666,16sleep30-21swapper/319:08:173
1321993329,3cyclictest30499-21kworker/3:022:03:033
1321992925,3cyclictest3374-21kworker/3:200:30:533
1321992826,2cyclictest3374-21kworker/3:200:26:033
1321992723,3cyclictest30499-21kworker/3:023:07:233
1321992421,3cyclictest30499-21kworker/3:023:27:033
131799242,22cyclictest0-21swapper/200:18:042
1317992419,4cyclictest27910-21gltestperf21:10:182
131799240,20cyclictest0-21swapper/221:18:132
1321992219,2cyclictest30499-21kworker/3:023:49:533
1321992219,2cyclictest30499-21kworker/3:022:21:133
132199220,21cyclictest30499-21kworker/3:023:37:233
131799221,20cyclictest0-21swapper/222:42:392
131599221,12cyclictest0-21swapper/122:50:141
131599220,0cyclictest0-21swapper/121:55:061
1321992118,3cyclictest30499-21kworker/3:022:49:233
1321992118,2cyclictest3374-21kworker/3:200:35:133
131799210,20cyclictest0-21swapper/200:25:332
132199200,19cyclictest0-21swapper/321:45:163
132199199,9cyclictest8458-21apache200:03:383
1321991917,2cyclictest30499-21kworker/3:023:14:333
1317991918,1cyclictest0-21swapper/223:55:232
131799191,17cyclictest56550irq/124-enp0s3120:00:572
131599194,9cyclictest0-21swapper/121:25:151
131599194,9cyclictest0-21swapper/121:25:151
131599190,0cyclictest0-21swapper/123:29:451
131099196,6cyclictest2248-21munin-run20:20:000
1310991917,1cyclictest0-21swapper/000:20:340
1321991817,1cyclictest0-21swapper/320:10:153
1321991816,2cyclictest30499-21kworker/3:023:56:033
1321991816,2cyclictest30499-21kworker/3:023:15:233
1321991816,2cyclictest30499-21kworker/3:023:15:233
1321991816,1cyclictest0-21swapper/323:51:393
1321991815,3cyclictest30499-21kworker/3:021:59:333
131799183,15cyclictest56550irq/124-enp0s3120:49:552
131799180,18cyclictest29481-21kworker/u8:223:22:002
131799180,0cyclictest0-21swapper/222:36:132
131099185,7cyclictest21604-21/usr/sbin/munin22:05:150
1321991714,3cyclictest30499-21kworker/3:021:11:533
1321991714,2cyclictest30499-21kworker/3:000:07:333
132199170,0cyclictest0-21swapper/322:17:293
1317991716,1cyclictest0-21swapper/223:32:232
1317991716,1cyclictest0-21swapper/200:03:032
131799170,17cyclictest0-21swapper/200:10:022
131799170,15cyclictest0-21swapper/223:48:462
131599171,1cyclictest141rcu_preempt23:20:051
131599170,15cyclictest0-21swapper/123:16:451
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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