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2026-06-16 - 00:54

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 Mon Jun 15, 2026 00:44:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2013909994741,4cyclictest335557-21systemd-journal20:25:001
2013910994440,2cyclictest2288292-21gpgv23:35:002
2013907993833,4cyclictest2071182-21diskstats20:05:150
2013909993733,3cyclictest2314597-21kworker/u8:3+flush-259:000:05:001
2013909993528,5cyclictest335557-21systemd-journal22:45:001
2013909993428,4cyclictest2142527-21ntpq21:10:221
2013910993327,4cyclictest2200658-21latency_hist22:10:012
2013909993227,4cyclictest335557-21systemd-journal23:09:341
2013909993127,3cyclictest2236915-21apt-get22:45:111
2013909993027,2cyclictest2081486-21kworker/u8:3+flush-259:020:17:131
2013909993026,3cyclictest2054882-21kworker/u8:0+flush-259:019:55:261
2013910992924,3cyclictest335557-21systemd-journal22:59:332
2013907992922,5cyclictest2349646-21ntpq00:30:210
2013915992823,3cyclictest2262651-21apt-get23:10:093
2013910992824,3cyclictest2054882-21kworker/u8:0+flush-259:019:55:252
2013909992824,3cyclictest2159597-21kworker/u8:0+flush-259:022:35:161
2013909992824,3cyclictest1971476-21kworker/u8:3+flush-259:019:25:221
2013907992824,3cyclictest2159543-21cat21:30:010
2013915992721,4cyclictest335557-21systemd-journal22:00:013
2013909992723,3cyclictest2272977-21apt-get23:20:101
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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