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2026-09-08 - 07:59

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 Tue Sep 08, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911240,114ptp4l0-21swapper/119:06:581
1552026957,10sleep110-21swapper/1119:06:123
1548826857,9sleep50-21swapper/519:05:427
1375126855,10sleep40-21swapper/419:05:176
1561626755,10sleep70-21swapper/719:07:329
1565826654,10sleep100-21swapper/1019:08:112
1562826654,10sleep60-21swapper/619:07:438
1549626553,10sleep00-21swapper/019:05:480
102372550,2sleep651-21ksoftirqd/623:55:128
1612999272,18cyclictest0-21swapper/423:25:016
16157992315,8cyclictest0-21swapper/1019:50:232
1613599239,13cyclictest0-21swapper/520:20:147
1612999233,15cyclictest0-21swapper/421:55:006
1612999212,6cyclictest0-21swapper/423:35:016
1612999212,6cyclictest0-21swapper/420:50:016
1610999191,17cyclictest0-21swapper/020:35:180
283491180,0ptp4l0-21swapper/120:45:171
1612699182,9cyclictest0-21swapper/320:25:015
1611999183,9cyclictest0-21swapper/220:20:014
1611999183,10cyclictest0-21swapper/223:25:244
283491170,1ptp4l21-21ksoftirqd/119:55:251
1614899173,8cyclictest0-21swapper/823:50:0110
1611999173,9cyclictest0-21swapper/220:50:224
1611999173,9cyclictest0-21swapper/220:45:014
1611999173,9cyclictest0-21swapper/200:25:244
1611999172,10cyclictest0-21swapper/221:15:014
1611999172,10cyclictest0-21swapper/221:15:004
1610999174,8cyclictest0-21swapper/022:20:010
1610999173,8cyclictest0-21swapper/019:21:230
283491160,7ptp4l4023-21cpu23:05:131
283491160,1ptp4l21-21ksoftirqd/123:50:291
283491160,1ptp4l21-21ksoftirqd/122:35:161
283491160,1ptp4l21-21ksoftirqd/120:00:181
283491160,1ptp4l21-21ksoftirqd/119:30:171
283491160,0ptp4l0-21swapper/121:45:241
1614899162,9cyclictest0-21swapper/821:55:0110
1612699163,9cyclictest0-21swapper/319:40:005
1612699163,8cyclictest0-21swapper/323:40:245
1611999163,8cyclictest0-21swapper/220:30:014
1611999163,10cyclictest0-21swapper/222:45:014
1611999162,9cyclictest0-21swapper/223:15:014
1610999163,8cyclictest0-21swapper/022:45:010
1610999163,8cyclictest0-21swapper/019:55:010
283491150,2ptp4l10236-21cpuspeed23:55:121
283491150,1ptp4l21-21ksoftirqd/120:10:141
283491150,0ptp4l0-21swapper/123:15:201
283491150,0ptp4l0-21swapper/121:40:171
283491150,0ptp4l0-21swapper/121:30:161
283491150,0ptp4l0-21swapper/121:10:201
283491150,0ptp4l0-21swapper/121:10:201
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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