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2026-06-08 - 18:53

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 08, 2026 12:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911250,113ptp4l0-21swapper/107:07:151
94080810,76rtkit-daemon0-21swapper/507:06:117
1088427361,9sleep60-21swapper/607:05:198
895927055,12sleep110-21swapper/1107:05:133
1193726655,9sleep70-21swapper/707:07:459
1184926655,9sleep00-21swapper/007:06:260
1021926655,8sleep40-21swapper/407:05:176
1202026554,9sleep100-21swapper/1007:09:002
51672510,0sleep110-21swapper/1111:10:133
1245899194,8cyclictest0-21swapper/107:35:011
1246399183,9cyclictest0-21swapper/210:10:004
283491170,1ptp4l0-21swapper/108:50:221
283491170,0ptp4l0-21swapper/110:05:201
283491170,0ptp4l0-21swapper/109:55:191
1248399173,9cyclictest0-21swapper/610:49:598
1248399170,12cyclictest1670-21kworker/u24:211:50:018
1247299170,6cyclictest0-21swapper/408:05:016
1246399173,9cyclictest0-21swapper/211:55:004
1246399173,10cyclictest0-21swapper/210:59:594
1245899173,8cyclictest0-21swapper/110:30:001
1245499172,10cyclictest0-21swapper/007:15:010
283491160,0ptp4l0-21swapper/111:35:241
283491160,0ptp4l0-21swapper/108:35:241
1249299163,8cyclictest0-21swapper/811:09:5910
1249299162,8cyclictest0-21swapper/808:35:0110
1249299162,8cyclictest0-21swapper/807:45:0110
1248899163,7cyclictest0-21swapper/709:40:009
1247999162,9cyclictest0-21swapper/508:15:007
1247999162,2cyclictest0-21swapper/510:55:177
1247299160,13cyclictest0-21swapper/412:00:006
1246399164,8cyclictest0-21swapper/208:00:014
1246399164,7cyclictest0-21swapper/210:00:004
1246399163,9cyclictest0-21swapper/208:45:224
1246399163,8cyclictest0-21swapper/210:50:004
1246399162,9cyclictest0-21swapper/211:00:014
1245899163,7cyclictest0-21swapper/110:40:251
1245499162,8cyclictest0-21swapper/009:15:010
1245499162,8cyclictest0-21swapper/008:50:250
119122167,7sleep80-21swapper/807:07:2210
283491150,0ptp4l0-21swapper/112:05:181
283491150,0ptp4l0-21swapper/111:30:121
283491150,0ptp4l0-21swapper/111:20:141
283491150,0ptp4l0-21swapper/110:00:231
283491150,0ptp4l0-21swapper/109:30:081
283491150,0ptp4l0-21swapper/108:55:121
283491150,0ptp4l0-21swapper/108:25:151
1249299152,7cyclictest0-21swapper/809:40:0010
1249299152,7cyclictest0-21swapper/809:10:0110
1249299152,7cyclictest0-21swapper/808:55:0110
1248899152,8cyclictest0-21swapper/712:10:019
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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