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2026-06-15 - 19:33

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #8

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 rack0slot8s.osadl.org (updated Mon Jun 15, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911000,90ptp4l0-21swapper/107:06:161
1287210088,10sleep100-21swapper/1007:06:142
94080800,75rtkit-daemon0-21swapper/507:06:017
3152627159,9sleep110-21swapper/1107:05:163
124026957,10sleep60-21swapper/607:05:348
140226655,9sleep00-21swapper/007:07:520
129726554,9sleep70-21swapper/707:06:239
125126453,9sleep40-21swapper/407:05:446
8952530,0sleep00-21swapper/012:25:240
92032490,0sleep121-21ksoftirqd/107:15:181
83352480,0sleep00-21swapper/008:40:140
194599253,18cyclictest0-21swapper/411:50:006
1958992310,7cyclictest18154-21taskset10:45:009
197399183,10cyclictest0-21swapper/910:25:2411
197399182,10cyclictest0-21swapper/907:10:0011
195899183,10cyclictest0-21swapper/707:40:009
193699183,10cyclictest0-21swapper/208:35:234
283491170,0ptp4l0-21swapper/110:20:261
197399172,13cyclictest0-21swapper/908:50:1611
195899170,10cyclictest0-21swapper/707:20:009
194099172,10cyclictest0-21swapper/308:40:005
283491160,0ptp4l0-21swapper/111:45:131
283491160,0ptp4l0-21swapper/111:30:181
283491160,0ptp4l0-21swapper/111:15:121
283491160,0ptp4l0-21swapper/107:45:021
197399163,8cyclictest0-21swapper/911:45:0111
197399163,8cyclictest0-21swapper/908:35:0011
195899163,9cyclictest0-21swapper/710:30:009
195899163,8cyclictest0-21swapper/708:30:009
194099163,7cyclictest0-21swapper/307:15:005
14102167,7sleep80-21swapper/807:08:0010
94080150,3rtkit-daemon0-21swapper/1111:18:363
197899154,7cyclictest0-21swapper/1009:15:002
197399153,7cyclictest0-21swapper/908:25:0011
196499150,10cyclictest0-21swapper/809:25:0010
195899154,7cyclictest0-21swapper/709:05:009
195899152,7cyclictest0-21swapper/711:30:019
194999152,8cyclictest0-21swapper/508:55:007
194099152,8cyclictest0-21swapper/310:45:015
194099152,8cyclictest0-21swapper/309:20:005
193099152,8cyclictest0-21swapper/109:05:001
193099152,8cyclictest0-21swapper/108:55:001
193099152,8cyclictest0-21swapper/108:00:001
283491140,0ptp4l0-21swapper/107:35:141
198299142,7cyclictest0-21swapper/1109:45:003
198299142,6cyclictest0-21swapper/1111:05:003
197399142,7cyclictest0-21swapper/912:20:0011
197399142,7cyclictest0-21swapper/908:50:0011
197399142,7cyclictest0-21swapper/907:50:0111
197399141,12cyclictest1015-21kworker/u24:007:30:0011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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