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2026-06-22 - 20:03

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 22, 2026 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911160,59ptp4l0-21swapper/107:06:261
94080980,93rtkit-daemon0-21swapper/007:08:250
229126453,9sleep50-21swapper/507:09:107
224026352,9sleep100-21swapper/1007:08:282
218026352,9sleep40-21swapper/407:07:326
210126351,10sleep60-21swapper/607:06:228
206326352,9sleep70-21swapper/707:05:479
229726252,8sleep110-21swapper/1107:09:163
293052490,0sleep60-21swapper/611:10:228
2547992618,8cyclictest0-21swapper/1011:20:192
254099230,22cyclictest0-21swapper/907:30:0011
19172198,8sleep80-21swapper/807:05:2410
252799183,8cyclictest0-21swapper/708:50:009
252799181,10cyclictest0-21swapper/710:25:009
249599183,9cyclictest0-21swapper/110:35:011
249499182,8cyclictest0-21swapper/007:40:010
255199174,8cyclictest0-21swapper/1109:45:003
2551991713,3cyclictest0-21swapper/1109:45:153
254099174,9cyclictest0-21swapper/911:35:0111
254099174,8cyclictest0-21swapper/912:25:0011
249599173,8cyclictest0-21swapper/112:20:241
249599172,9cyclictest0-21swapper/111:40:011
283491160,0ptp4l0-21swapper/111:40:191
283491160,0ptp4l0-21swapper/109:25:001
283491160,0ptp4l0-21swapper/109:25:001
254099163,8cyclictest0-21swapper/909:25:0011
254099163,8cyclictest0-21swapper/909:25:0011
250799162,9cyclictest0-21swapper/411:05:016
249899163,8cyclictest0-21swapper/311:50:015
249899162,9cyclictest0-21swapper/310:30:245
249899162,8cyclictest0-21swapper/312:20:005
249899162,8cyclictest0-21swapper/312:05:015
249599162,9cyclictest0-21swapper/109:20:001
249599162,9cyclictest0-21swapper/109:20:001
249599162,9cyclictest0-21swapper/108:15:001
249499163,8cyclictest0-21swapper/010:30:010
249499163,8cyclictest0-21swapper/009:54:390
249499163,8cyclictest0-21swapper/009:15:000
249499163,8cyclictest0-21swapper/009:15:000
283491150,1ptp4l21-21ksoftirqd/109:55:121
283491150,1ptp4l21-21ksoftirqd/107:10:131
283491150,0ptp4l0-21swapper/110:15:101
283491150,0ptp4l0-21swapper/108:15:131
255199152,8cyclictest0-21swapper/1109:00:003
255199152,8cyclictest0-21swapper/1109:00:003
254799150,1cyclictest0-21swapper/1009:35:212
254099153,7cyclictest0-21swapper/908:15:2311
254099152,8cyclictest0-21swapper/912:15:2311
254099152,8cyclictest0-21swapper/910:10:0011
2540991512,2cyclictest0-21swapper/910:15:1511
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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