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2026-06-29 - 22:08

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 29, 2026 00:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911080,97ptp4l0-21swapper/119:05:181
2867329280,10sleep110-21swapper/1119:06:113
2870827766,9sleep50-21swapper/519:06:407
2877326353,8sleep00-21swapper/019:07:370
241032630,1sleep80-21swapper/819:40:2210
2872426049,9sleep70-21swapper/719:06:559
2666525744,10sleep40-21swapper/419:05:156
317282550,0sleep80-21swapper/822:40:1710
2882225543,10sleep100-21swapper/1019:08:232
2876625442,10sleep60-21swapper/619:07:308
301562530,0sleep30-21swapper/322:40:015
116192480,1sleep111009-21runrttasks21:30:253
167052390,0sleep100-21swapper/1023:45:132
2931899254,16cyclictest0-21swapper/421:29:596
2931899222,15cyclictest0-21swapper/420:30:016
2931899211,16cyclictest0-21swapper/422:55:006
2931899201,14cyclictest0-21swapper/420:30:016
283491190,5ptp4l21-21ksoftirqd/121:10:241
2934799181,16cyclictest0-21swapper/1000:10:182
2932399183,8cyclictest0-21swapper/519:15:017
2930999184,9cyclictest0-21swapper/200:05:014
283491180,0ptp4l0-21swapper/119:15:011
2933899173,9cyclictest0-21swapper/820:55:0110
2933499173,8cyclictest0-21swapper/719:15:019
2930999173,9cyclictest0-21swapper/221:55:004
2930999173,9cyclictest0-21swapper/219:40:004
283491170,1ptp4l21-21ksoftirqd/123:10:011
283491170,0ptp4l0-21swapper/100:20:161
110192170,0sleep30-21swapper/320:50:135
2935299162,8cyclictest0-21swapper/1121:05:013
2933499162,10cyclictest0-21swapper/719:24:309
2933499160,1cyclictest0-21swapper/723:40:259
2933499160,15cyclictest0-21swapper/722:05:269
2930999163,8cyclictest0-21swapper/222:45:014
2930999161,9cyclictest0-21swapper/222:09:594
2930499163,8cyclictest0-21swapper/121:44:591
287512167,7sleep80-21swapper/819:07:2010
283491160,1ptp4l21-21ksoftirqd/119:20:161
283491160,1ptp4l1009-21runrttasks00:35:251
283491160,0ptp4l0-21swapper/120:55:121
2935299152,7cyclictest0-21swapper/1123:45:013
2935299152,7cyclictest0-21swapper/1120:35:013
2934799150,3cyclictest0-21swapper/1000:15:172
2933899153,7cyclictest0-21swapper/819:25:2410
2933899153,7cyclictest0-21swapper/819:20:0010
2933499152,8cyclictest0-21swapper/720:55:009
2932399152,8cyclictest0-21swapper/523:44:597
2932399152,8cyclictest0-21swapper/521:40:257
2930999153,8cyclictest0-21swapper/220:20:014
2930999153,8cyclictest0-21swapper/200:00:014
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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