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2026-06-01 - 18:10

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 01, 2026 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911000,89ptp4l0-21swapper/107:05:201
2300027965,12sleep70-21swapper/707:09:339
2288927052,10sleep40-21swapper/407:07:536
2275026958,9sleep00-21swapper/007:05:490
2285526856,10sleep110-21swapper/1107:07:243
2272726852,8sleep50-21swapper/507:05:307
1975426655,9sleep100-21swapper/1007:05:112
2274126553,10sleep60-21swapper/607:05:438
91992500,0sleep10-21swapper/107:30:161
52982500,0sleep50-21swapper/509:30:207
191962490,0sleep81009-21runrttasks07:45:0010
2339399233,16cyclictest0-21swapper/411:35:016
2339399232,8cyclictest0-21swapper/408:55:006
2339399212,14cyclictest0-21swapper/407:20:006
2341699193,9cyclictest0-21swapper/912:05:0011
2342199180,1cyclictest0-21swapper/1009:12:192
283491170,0ptp4l0-21swapper/111:05:161
2342199170,3cyclictest0-21swapper/1007:55:152
2338799174,8cyclictest0-21swapper/312:20:015
2337899170,3cyclictest246311switchtime09:55:261
2337299172,8cyclictest0-21swapper/012:30:020
283491160,1ptp4l21-21ksoftirqd/108:25:131
283491160,1ptp4l21-21ksoftirqd/107:50:241
283491160,0ptp4l0-21swapper/110:25:191
283491160,0ptp4l0-21swapper/110:25:191
283491160,0ptp4l0-21swapper/107:35:181
269662160,0sleep00-21swapper/012:05:190
2342199160,1cyclictest0-21swapper/1009:15:152
2341699163,7cyclictest0-21swapper/911:05:0011
2340699160,15cyclictest0-21swapper/709:15:009
2339399162,13cyclictest0-21swapper/411:55:016
2338799163,8cyclictest0-21swapper/310:00:005
2338799163,8cyclictest0-21swapper/309:45:005
2338799163,7cyclictest0-21swapper/309:20:005
2337899160,2cyclictest3572-21sort08:05:201
2337299163,7cyclictest0-21swapper/010:45:010
2337299160,2cyclictest0-21swapper/011:40:150
229192167,7sleep80-21swapper/807:08:2110
283491150,1ptp4l21-21ksoftirqd/112:15:201
283491150,0ptp4l0-21swapper/110:45:201
283491150,0ptp4l0-21swapper/110:15:251
283491150,0ptp4l0-21swapper/110:15:241
2342199150,2cyclictest0-21swapper/1008:40:162
2341699153,7cyclictest0-21swapper/908:25:0011
2341699152,7cyclictest0-21swapper/908:55:2411
2341699150,2cyclictest0-21swapper/911:10:1611
2338799153,8cyclictest0-21swapper/308:30:005
2338799153,7cyclictest0-21swapper/308:45:005
2338799152,8cyclictest0-21swapper/311:00:245
2338799152,8cyclictest0-21swapper/309:00:005
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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