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2026-07-14 - 00:59

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 Mon Jul 13, 2026 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
94080970,92rtkit-daemon0-21swapper/1107:09:293
283491950,82ptp4l0-21swapper/107:05:221
2616827360,10sleep70-21swapper/707:09:039
2528926855,10sleep60-21swapper/607:05:268
2611226755,10sleep50-21swapper/507:08:137
2602426655,9sleep100-21swapper/1007:06:542
2600026655,9sleep00-21swapper/007:06:320
2609826555,8sleep40-21swapper/407:08:006
104892470,0sleep70-21swapper/710:15:229
101132460,0sleep00-21swapper/009:35:100
2662499213,14cyclictest0-21swapper/411:15:006
2662499211,7cyclictest0-21swapper/409:40:016
283491200,1ptp4l21-21ksoftirqd/110:24:331
2661599183,9cyclictest0-21swapper/210:20:244
26606991713,2cyclictest0-21swapper/011:05:160
2660699170,2cyclictest0-21swapper/010:45:190
283491160,1ptp4l21-21ksoftirqd/111:35:171
283491160,1ptp4l0-21swapper/109:55:191
283491160,0ptp4l0-21swapper/112:10:191
283491160,0ptp4l0-21swapper/110:55:121
283491160,0ptp4l0-21swapper/107:20:121
2665799162,10cyclictest0-21swapper/1107:20:003
2664499162,9cyclictest0-21swapper/808:15:0110
2664499162,9cyclictest0-21swapper/808:15:0110
2663599163,8cyclictest0-21swapper/608:05:018
2663599163,8cyclictest0-21swapper/608:05:018
2663599162,8cyclictest0-21swapper/612:35:008
2662899161,2cyclictest0-21swapper/509:20:177
2660699162,8cyclictest0-21swapper/007:35:000
283491150,1ptp4l21-21ksoftirqd/111:55:231
283491150,0ptp4l0-21swapper/110:05:241
2664499153,7cyclictest0-21swapper/810:55:0110
2664499153,7cyclictest0-21swapper/808:55:0110
2664499153,7cyclictest0-21swapper/808:35:0110
2664499153,7cyclictest0-21swapper/808:05:0110
2664499153,7cyclictest0-21swapper/808:05:0110
2664499152,7cyclictest0-21swapper/811:55:0010
2663599153,7cyclictest0-21swapper/612:25:248
2663599152,8cyclictest0-21swapper/611:10:018
2663599152,8cyclictest0-21swapper/610:50:248
2663599152,8cyclictest0-21swapper/608:45:018
2663599152,7cyclictest0-21swapper/607:20:248
2663599151,8cyclictest0-21swapper/611:25:008
2662499152,8cyclictest0-21swapper/409:10:256
2660699153,7cyclictest0-21swapper/008:40:010
2660699152,8cyclictest0-21swapper/009:20:010
108672150,2sleep333-21ksoftirqd/307:30:015
283491140,1ptp4l21-21ksoftirqd/112:00:101
283491140,0ptp4l0-21swapper/111:15:201
283491140,0ptp4l0-21swapper/110:10:241
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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