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2026-09-22 - 11:28

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 22, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911280,60ptp4l0-21swapper/119:06:151
2272327152,10sleep50-21swapper/519:09:367
2254727052,9sleep40-21swapper/419:06:596
2255426856,10sleep110-21swapper/1119:07:073
2259426756,9sleep100-21swapper/1019:07:412
1945926756,9sleep00-21swapper/019:05:060
2250626654,10sleep70-21swapper/719:06:269
2236826452,9sleep60-21swapper/619:05:248
138742550,0sleep10-21swapper/122:25:151
14772520,0sleep10-21swapper/122:10:151
2309599212,12cyclictest0-21swapper/021:55:000
2309599212,12cyclictest0-21swapper/021:55:000
283491190,0ptp4l0-21swapper/120:30:151
2313999192,3cyclictest0-21swapper/900:20:1711
2313599193,8cyclictest0-21swapper/823:45:2310
2310699193,10cyclictest0-21swapper/222:10:014
264172180,0sleep40-21swapper/423:25:126
2310699183,9cyclictest0-21swapper/223:25:014
283491170,0ptp4l0-21swapper/120:45:131
2313599172,8cyclictest0-21swapper/821:40:0010
2310699174,8cyclictest0-21swapper/221:45:004
2310699174,8cyclictest0-21swapper/221:45:004
2310699172,9cyclictest0-21swapper/220:45:004
2310699172,11cyclictest0-21swapper/222:15:014
2309599172,9cyclictest0-21swapper/000:05:000
2309599171,10cyclictest0-21swapper/020:50:000
283491160,1ptp4l21-21ksoftirqd/120:35:191
283491160,0ptp4l0-21swapper/123:20:141
283491160,0ptp4l0-21swapper/122:45:131
283491160,0ptp4l0-21swapper/119:10:171
2313999162,8cyclictest0-21swapper/919:40:0011
2312999163,8cyclictest0-21swapper/700:25:019
2312599163,8cyclictest0-21swapper/619:50:018
2310699164,8cyclictest0-21swapper/219:10:004
2310699163,9cyclictest0-21swapper/223:00:014
2310699163,9cyclictest0-21swapper/221:05:004
2310699163,8cyclictest0-21swapper/223:32:044
2310699163,8cyclictest0-21swapper/200:30:014
23106991613,2cyclictest0-21swapper/222:40:164
2309599162,8cyclictest0-21swapper/022:40:000
194542167,7sleep80-21swapper/819:05:0210
94080150,2rtkit-daemon0-21swapper/421:40:126
94080150,2rtkit-daemon0-21swapper/421:40:126
283491150,0ptp4l0-21swapper/120:15:161
2314899154,7cyclictest0-21swapper/1122:10:013
2314899152,8cyclictest0-21swapper/1121:40:003
2314899152,7cyclictest0-21swapper/1119:15:003
2314499150,6cyclictest0-21swapper/1019:20:142
2313999153,8cyclictest0-21swapper/900:05:0111
2313999152,9cyclictest0-21swapper/923:10:2311
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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