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2026-04-17 - 20:15

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack3slot6s.osadl.org (updated Fri Apr 17, 2026 12:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13424211593,15sleep00-21swapper/007:06:030
13557211497,12sleep30-21swapper/307:07:023
136482113102,6sleep20-21swapper/207:08:132
13607211094,11sleep10-21swapper/107:07:401
107082820,0sleep30-21swapper/311:36:033
322272720,1sleep332235-21latency11:25:163
263362620,1sleep00-21swapper/010:12:030
141622350,4sleep1221ktimersoftd/111:40:141
1381699340,2cyclictest0-21swapper/008:35:120
1381699340,2cyclictest0-21swapper/008:35:120
145682260,0sleep30-21swapper/312:14:583
1381699260,24cyclictest0-21swapper/008:55:120
1381899250,2cyclictest0-21swapper/208:35:122
1381899250,2cyclictest0-21swapper/208:35:122
212742240,1sleep30-21swapper/311:47:303
288552230,1sleep30-21swapper/312:29:503
13816992320,2cyclictest28540-21ssh10:15:110
1381899222,18cyclictest0-21swapper/207:50:112
13819992118,2cyclictest25194-21kworker/u8:207:47:043
13819992115,5cyclictest0-21swapper/310:22:043
1381999211,18cyclictest25207-21ssh10:45:103
1381999210,5cyclictest0-21swapper/312:31:043
1381999210,16cyclictest0-21swapper/309:46:043
1381899210,19cyclictest0-21swapper/208:55:132
13819992017,2cyclictest8536-21kworker/u8:111:12:043
13819992017,2cyclictest8536-21kworker/u8:111:01:043
13819992017,2cyclictest842-21kworker/u8:110:40:043
13819992017,2cyclictest842-21kworker/u8:110:26:053
13819992017,2cyclictest8332-21kworker/u8:008:22:043
13819992017,2cyclictest8332-21kworker/u8:008:17:043
13819992017,2cyclictest30482-21kworker/u8:111:24:043
13819992017,2cyclictest28619-21kworker/u8:110:52:013
13819992017,2cyclictest24078-21kworker/u8:109:19:043
13819992017,2cyclictest22402-21kworker/u8:109:36:043
13819992017,2cyclictest21993-21kworker/u8:208:49:043
13819992017,2cyclictest21776-21kworker/u8:210:57:043
13819992017,2cyclictest21776-21kworker/u8:210:39:043
13819992017,2cyclictest21776-21kworker/u8:210:32:043
13819992017,2cyclictest20240-21kworker/u8:107:41:043
13819992017,2cyclictest20171-21kworker/u8:011:18:053
13819992017,2cyclictest15574-21kworker/u8:010:07:043
13819992017,2cyclictest14388-21kworker/u8:008:32:043
13819992017,2cyclictest14388-21kworker/u8:008:32:043
13819992017,2cyclictest11427-21kworker/u8:009:43:043
13819992017,2cyclictest11427-21kworker/u8:009:27:043
13818992017,2cyclictest20171-21kworker/u8:011:53:042
1381799200,2cyclictest0-21swapper/108:05:101
1381699200,2cyclictest0-21swapper/010:55:100
13819991916,2cyclictest8332-21kworker/u8:008:25:043
13819991916,2cyclictest27187-21kworker/u8:010:19:043
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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