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2026-07-28 - 12:35

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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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.

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 20 highest latencies:
System rackeslot4s.osadl.org (updated Tue Jul 28, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1184163995448,4cyclictest1393177-21latency_hist22:35:002
1184163995350,2cyclictest1194977-21kworker/u8:0+events_unbound21:05:002
1184163994339,3cyclictest1518555-21kworker/u8:1+events_unbound00:40:002
1184163994239,2cyclictest1194977-21kworker/u8:0+events_unbound20:15:232
1184160994236,4cyclictest335557-21systemd-journal19:50:481
1184160994037,2cyclictest1507903-21cp00:25:001
1184158994037,2cyclictest1194977-21kworker/u8:0+events_unbound19:59:490
1184163993936,2cyclictest1314855-21kworker/u8:1+events_unbound00:15:232
1184163993936,2cyclictest1194977-21kworker/u8:0+events_unbound20:10:192
1184158993936,2cyclictest1194977-21kworker/u8:0+events_unbound20:15:250
1184158993933,5cyclictest1189959-21latency_hist19:20:010
1184168993833,3cyclictest335557-21systemd-journal22:37:143
1184163993834,3cyclictest1194977-21kworker/u8:0+events_unbound20:30:162
1184158993834,3cyclictest1393407-21kworker/u8:2+events_unbound23:20:490
1184168993734,2cyclictest1194977-21kworker/u8:0+flush-259:020:37:493
1184163993733,3cyclictest1194977-21kworker/u8:0+flush-259:020:35:152
1184160993731,4cyclictest1513355-21latency_hist00:30:011
1184163993633,2cyclictest1194977-21kworker/u8:0+flush-259:021:05:162
1184158993532,2cyclictest1314855-21kworker/u8:1+events_unbound22:05:250
1184163993431,2cyclictest3301981-21kworker/u8:2+events_unbound19:17:492
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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