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2026-07-06 - 22:18

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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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 06, 2026 12:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911060,56ptp4l0-21swapper/107:09:161
94080870,82rtkit-daemon0-21swapper/507:07:457
1850127159,10sleep110-21swapper/1107:08:303
1757326956,10sleep40-21swapper/407:05:236
1840826755,10sleep00-21swapper/007:07:070
1839226756,9sleep100-21swapper/1007:06:532
1844326654,10sleep70-21swapper/707:07:389
1833326655,9sleep60-21swapper/607:06:018
135092590,0sleep30-21swapper/311:55:145
237572510,0sleep90-21swapper/908:35:2411
17772470,0sleep110-21swapper/1110:15:123
19000992720,7cyclictest0-21swapper/1008:20:172
1897399222,15cyclictest0-21swapper/409:55:016
1897399212,15cyclictest0-21swapper/409:30:016
1897399212,15cyclictest0-21swapper/409:30:016
1900099202,3cyclictest0-21swapper/1012:35:172
1899599203,9cyclictest0-21swapper/910:45:0111
1898699183,8cyclictest0-21swapper/710:35:239
1897399182,13cyclictest0-21swapper/409:25:016
1897399182,13cyclictest0-21swapper/409:25:016
1895799183,9cyclictest0-21swapper/110:15:011
283491170,0ptp4l0-21swapper/109:40:161
1898699171,2cyclictest0-21swapper/710:10:159
183892171,8sleep80-21swapper/807:06:5110
174492170,0sleep30-21swapper/307:05:215
283491160,1ptp4l21-21ksoftirqd/110:50:211
283491160,0ptp4l0-21swapper/112:25:151
283491160,0ptp4l0-21swapper/109:20:141
283491160,0ptp4l0-21swapper/109:20:141
1899599163,8cyclictest0-21swapper/908:45:2511
1896799163,8cyclictest0-21swapper/312:25:005
283491150,1ptp4l21-21ksoftirqd/107:45:171
283491150,0ptp4l0-21swapper/111:40:141
283491150,0ptp4l0-21swapper/108:45:171
283491150,0ptp4l0-21swapper/107:24:181
1900099153,7cyclictest0-21swapper/1011:04:482
1899599153,7cyclictest0-21swapper/912:15:0111
1899599152,8cyclictest0-21swapper/909:10:2511
1899599152,8cyclictest0-21swapper/909:10:2511
1899599152,8cyclictest0-21swapper/908:35:0011
1899599151,9cyclictest0-21swapper/907:45:0011
1898699153,7cyclictest0-21swapper/709:45:019
1898699153,7cyclictest0-21swapper/709:05:009
1898699153,7cyclictest0-21swapper/709:05:009
1896799152,7cyclictest0-21swapper/307:40:005
1895799153,7cyclictest0-21swapper/110:45:011
1895799153,7cyclictest0-21swapper/108:15:001
1895799152,9cyclictest0-21swapper/110:55:011
62472140,0sleep10-21swapper/108:15:141
283491140,1ptp4l21-21ksoftirqd/108:50:251
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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