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2026-06-17 - 05:56

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 50 highest latencies:
System rackeslot4s.osadl.org (updated Wed Jun 17, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25694994842,4cyclictest335557-21systemd-journal00:10:013
25690994845,2cyclictest77820-21kworker/u8:2+flush-259:020:15:002
25681994832,14cyclictest244103-21gpgv22:40:010
25686994236,4cyclictest207537-21latency_hist22:05:001
25694994138,2cyclictest52004-21kworker/u8:4+flush-259:020:00:003
25686993834,3cyclictest275202-21kworker/u8:3+flush-259:023:30:161
25690993734,2cyclictest275202-21kworker/u8:3+flush-259:023:50:012
25686993632,3cyclictest347222-21gpgv00:20:001
25690993532,2cyclictest93325-21kworker/u8:1+flush-259:021:20:002
25686993328,3cyclictest335557-21systemd-journal21:11:191
25686993229,2cyclictest52004-21kworker/u8:4+flush-259:020:10:001
25686993227,4cyclictest169976-21ntpq21:25:221
25681993125,4cyclictest56016-21ntpq19:35:200
25681993125,4cyclictest305872-21latency_hist23:40:010
25686993024,4cyclictest160503-21latency_hist21:20:011
25694992824,3cyclictest275202-21kworker/u8:3+flush-259:023:30:003
25694992824,3cyclictest119025-21kworker/u8:3+flush-259:021:00:013
25690992822,5cyclictest248311-21ntpq22:40:222
25686992823,3cyclictest326713-21/usr/sbin/munin00:00:131
25681992825,2cyclictest31058-21apt-get19:15:110
25681992822,4cyclictest335557-21systemd-journal20:25:000
25681992822,4cyclictest175167-21ntpq21:30:220
25694992722,3cyclictest335557-21systemd-journal20:19:593
25690992724,2cyclictest52004-21kworker/u8:4+flush-259:020:04:592
25686992719,6cyclictest368420-21gpgv00:40:011
25681992721,4cyclictest335557-21systemd-journal23:45:000
25690992622,3cyclictest93325-21kworker/u8:1+flush-259:020:55:172
25686992621,4cyclictest358100-21apt-get00:30:111
25681992620,4cyclictest211876-21ntpq22:05:240
25690992522,2cyclictest103475-21kworker/u8:3+flush-259:020:30:002
25690992521,3cyclictest249440-21kworker/u8:3+flush-259:022:45:262
25690992521,2cyclictest145227-21apt-get21:05:122
25686992522,2cyclictest347725-21base6400:20:001
25681992518,5cyclictest249208-21latency_hist22:45:010
25694992422,1cyclictest61583-21fwupd19:40:263
25694992418,4cyclictest335557-21systemd-journal21:40:273
25690992421,2cyclictest66393-21kworker/u8:0+flush-259:020:19:592
25686992420,3cyclictest66393-21kworker/u8:0+flush-259:020:55:011
25686992419,4cyclictest197278-21latency_hist21:55:011
25686992418,4cyclictest509-21rs:main1
25686992418,4cyclictest254682-21apt-get22:50:131
25686992418,4cyclictest254682-21apt-get22:50:131
25681992421,2cyclictest336868-21true00:10:010
25681992418,4cyclictest335557-21systemd-journal22:49:550
25694992317,4cyclictest82810-21latency_hist20:05:013
25690992319,3cyclictest335557-21systemd-journal20:36:112
25690992319,3cyclictest335557-21systemd-journal20:36:112
25690992319,3cyclictest181677-21kworker/u8:1+flush-259:021:50:012
25690992318,3cyclictest509-21rs:main2
25686992319,3cyclictest66393-21kworker/u8:0+flush-259:020:20:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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