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2026-09-15 - 07:55

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 15, 2026 00:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911130,57ptp4l0-21swapper/119:05:551
94080830,78rtkit-daemon0-21swapper/519:07:337
2330327253,10sleep00-21swapper/019:08:030
2319026856,10sleep110-21swapper/1119:06:263
2314826756,9sleep100-21swapper/1019:05:492
2228626754,10sleep70-21swapper/719:05:219
2321126656,8sleep40-21swapper/419:06:446
2315726655,9sleep60-21swapper/619:05:588
46932550,0sleep110-21swapper/1121:30:163
162352490,0sleep90-21swapper/921:45:1611
150472470,0sleep90-21swapper/923:10:0011
283491190,4ptp4l21-21ksoftirqd/120:35:141
2378699193,8cyclictest0-21swapper/023:50:000
2382299184,9cyclictest0-21swapper/819:25:0110
2378699183,10cyclictest0-21swapper/022:05:010
2378699183,10cyclictest0-21swapper/022:05:000
283491170,0ptp4l0-21swapper/123:25:071
2381399174,9cyclictest0-21swapper/621:45:008
2380999172,8cyclictest0-21swapper/520:30:007
2379199173,8cyclictest0-21swapper/122:15:011
2379199173,8cyclictest0-21swapper/122:15:011
2379199172,9cyclictest0-21swapper/119:30:011
283491160,1ptp4l21-21ksoftirqd/122:00:161
283491160,1ptp4l21-21ksoftirqd/122:00:151
283491160,1ptp4l21-21ksoftirqd/121:00:261
283491160,0ptp4l0-21swapper/100:20:251
283491160,0ptp4l0-21swapper/100:15:211
2381399162,8cyclictest0-21swapper/620:35:008
2379599163,9cyclictest0-21swapper/219:20:014
2378699163,8cyclictest0-21swapper/000:10:010
2378699162,8cyclictest0-21swapper/019:45:010
231312161,7sleep80-21swapper/819:05:3410
114232160,0sleep110-21swapper/1100:25:233
73722150,0sleep60-21swapper/622:15:168
73722150,0sleep60-21swapper/622:15:158
283491150,0ptp4l0-21swapper/122:45:141
2383699152,7cyclictest0-21swapper/1120:55:013
2382299152,8cyclictest0-21swapper/822:35:0110
2381899153,7cyclictest0-21swapper/721:10:019
2381899152,7cyclictest0-21swapper/719:25:019
2381399153,7cyclictest0-21swapper/619:30:248
2381399152,8cyclictest0-21swapper/623:50:018
2381399152,8cyclictest0-21swapper/600:30:008
2380999154,6cyclictest0-21swapper/520:20:017
2379599153,8cyclictest0-21swapper/200:25:014
2379199152,7cyclictest0-21swapper/121:15:001
52832140,0sleep20-21swapper/222:55:154
292722140,0sleep227-21ksoftirqd/200:10:114
283491140,6ptp4l21-21ksoftirqd/123:20:141
283491140,1ptp4l21-21ksoftirqd/120:20:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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