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2026-05-13 - 03:30

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

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.

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 10 highest latencies:
System rackeslot4s.osadl.org (updated Wed May 13, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1049094997064,4cyclictest1147785-21kworker/u8:0+flush-259:021:30:002
1049094995752,3cyclictest1054669-21kworker/u8:2+flush-259:020:30:012
1049099995552,2cyclictest1362147-21kworker/u8:2+events_unbound00:33:173
1049099995349,3cyclictest1356631-21gpgv00:05:013
1049099995349,3cyclictest1356631-21gpgv00:05:003
1049099995148,2cyclictest1147785-21kworker/u8:0+events_unbound21:52:363
1049099995148,2cyclictest1054669-21kworker/u8:2+events_unbound20:51:393
1049099995047,2cyclictest1147785-21kworker/u8:0+events_unbound21:32:393
1049094995045,4cyclictest1236218-21kworker/u8:1+flush-259:023:25:002
1049099994946,2cyclictest1351560-21kworker/u8:4+events_unbound00:26:393
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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