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2026-03-28 - 23:20

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 Sat Mar 28, 2026 12:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
145224994139,1cyclictest300785-21fwupd09:38:173
145224994137,3cyclictest229161-21kworker/u8:4+flush-259:008:55:173
145215993631,4cyclictest275638-21diskstats09:15:150
145224993431,2cyclictest352332-21kworker/u8:1+flush-259:011:00:183
145224993431,2cyclictest352332-21kworker/u8:1+flush-259:011:00:173
145215993329,3cyclictest192704-21apt-get07:55:110
145222993227,3cyclictest461745-21/usr/sbin/munin12:15:252
145224993025,4cyclictest441133-21apt-get11:55:113
145218993024,4cyclictest249490-21latency_hist08:50:011
145215993026,3cyclictest203028-21apt-get08:05:120
145224992925,3cyclictest202780-21kworker/u8:1+flush-259:008:15:203
145222992926,2cyclictest352585-21gpgv10:30:002
145222992923,4cyclictest300948-21latency_hist09:40:012
145218992925,3cyclictest2267756-21kworker/u8:5+flush-259:007:30:011
145222992825,2cyclictest352332-21kworker/u8:1+flush-259:010:50:002
145218992724,2cyclictest409872-21kworker/u8:4+events_unbound11:45:151
145218992722,3cyclictest252-21systemd-journal07:13:161
145215992724,2cyclictest229161-21kworker/u8:4+flush-259:008:40:220
145222992622,3cyclictest239227-21kworker/u8:1+flush-259:009:00:252
145218992622,3cyclictest252-21systemd-journal08:10:001
145215992621,3cyclictest509-21rs:main0
145224992521,3cyclictest461742-21kworker/u8:2+events_unbound12:15:153
145224992521,3cyclictest275440-21kworker/u8:0+events_unbound09:40:133
145224992519,4cyclictest311252-21latency_hist09:50:013
145215992520,3cyclictest394548-21apt-get11:10:120
145224992418,4cyclictest270471-21diskstats09:10:133
145218992420,3cyclictest192551-21base6407:55:011
145215992421,2cyclictest326787-21kworker/u8:2+flush-259:010:25:000
145215992419,4cyclictest259786-21latency_hist09:00:010
145224992318,4cyclictest259837-21kworker/u8:2+events_unbound09:05:003
145224992317,4cyclictest321849-21apt-get10:00:123
145224992316,5cyclictest252-21systemd-journal11:20:183
145222992319,3cyclictest363542-21kworker/u8:2+flush-259:010:55:242
145222992319,3cyclictest140028-21kworker/u8:1+flush-259:007:10:172
145218992319,3cyclictest363312-21latency_hist10:40:001
145218992319,3cyclictest252-21systemd-journal09:17:161
145215992320,2cyclictest275440-21kworker/u8:0+flush-259:009:30:000
145224992219,2cyclictest379029-21kworker/u8:3+events_unbound12:00:153
145224992218,3cyclictest420202-21kworker/u8:1+flush-259:011:40:013
145224992218,3cyclictest399488-21kworker/u8:0+events_unbound11:15:283
145224992216,4cyclictest435710-21latency_hist11:50:013
145222992219,2cyclictest192131-21gpgv07:55:002
145222992216,4cyclictest223872-21cat08:25:012
145218992219,2cyclictest223276-21kworker/u8:1+flush-259:008:25:211
145224992118,2cyclictest171349-21turbostat.cron07:35:013
145224992117,3cyclictest388773-21kworker/u8:0+flush-259:011:05:153
145224992117,3cyclictest229161-21kworker/u8:4+events_unbound10:30:173
145215992117,3cyclictest472018-21apt-get12:25:120
145215992114,5cyclictest403763-21ntpq11:15:230
145224992016,3cyclictest275440-21kworker/u8:0+flush-259:009:20:163
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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