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2026-05-05 - 04:35

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 50 highest latencies:
System rackeslot4s.osadl.org (updated Tue May 05, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
638341994134,5cyclictest700275-21latency_hist20:10:011
638341994036,3cyclictest939366-21kworker/u8:1+events_unbound00:26:231
638341994036,3cyclictest939366-21kworker/u8:1+events_unbound00:26:221
638341993832,3cyclictest830050-21kworker/u8:1+flush-259:022:30:161
638341993732,3cyclictest763984-21kworker/u8:1+flush-259:021:35:241
638344993327,4cyclictest939373-21cp00:00:002
638339993329,3cyclictest252-21systemd-journal20:56:210
638341993229,2cyclictest939366-21kworker/u8:1+flush-259:000:35:241
638341993225,5cyclictest870594-21ntpq22:50:241
638339993228,3cyclictest851074-21apt-get22:35:100
638344993024,4cyclictest252-21systemd-journal00:30:212
638339993024,4cyclictest741289-21ntpq20:45:220
638341992925,3cyclictest793405-21kworker/u8:3+flush-259:022:05:221
638341992923,4cyclictest793978-21apt-get21:40:121
638344992824,3cyclictest939366-21kworker/u8:1+flush-259:000:35:152
638341992825,2cyclictest928868-21kworker/u8:0+flush-259:023:55:201
638341992825,2cyclictest685045-21kworker/u8:1+events_unbound20:00:251
638341992824,3cyclictest928868-21kworker/u8:0+events_unbound00:00:141
638341992824,3cyclictest830050-21kworker/u8:1+events_unbound23:05:251
638341992824,3cyclictest793405-21kworker/u8:3+flush-259:022:00:001
638341992822,4cyclictest787658-21ntpq21:30:211
638349992722,4cyclictest882276-21gpgv23:05:013
638344992720,5cyclictest767057-21ntpq21:10:212
638341992723,3cyclictest939366-21kworker/u8:1+events_unbound00:34:211
638341992723,3cyclictest892513-21kworker/u8:4+events_unbound23:34:231
638341992723,3cyclictest763984-21kworker/u8:1+flush-259:021:20:211
638341992723,2cyclictest669540-21kworker/u8:2+events_unbound20:15:231
638341992721,4cyclictest949960-21/usr/sbin/munin00:10:131
638339992722,4cyclictest861375-21apt-get22:45:110
638341992622,3cyclictest944853-21apt-get00:05:161
638341992622,3cyclictest830050-21kworker/u8:1+flush-259:022:22:211
638341992622,3cyclictest746920-21kworker/u8:2+events_unbound21:10:151
638341992622,3cyclictest685045-21kworker/u8:1+events_unbound20:13:221
638341992620,4cyclictest861120-21latency_hist22:45:011
638339992623,2cyclictest861342-21kworker/u8:3+events_unbound23:00:010
638344992519,4cyclictest252-21systemd-journal22:37:062
638341992523,1cyclictest830050-21kworker/u8:1+events_unbound22:55:121
638341992522,2cyclictest850836-21kworker/u8:0+flush-259:022:35:211
638339992521,3cyclictest773354-21apt-get21:20:110
638339992519,4cyclictest975764-21apt-get00:35:120
638344992419,3cyclictest871436-21kworker/u8:2+flush-259:023:05:182
638341992421,2cyclictest763984-21kworker/u8:1+events_unbound21:51:481
638341992421,2cyclictest711308-21kworker/u8:3+events_unbound21:06:391
638341992418,4cyclictest252-21systemd-journal23:11:211
638339992419,4cyclictest747301-21latency_hist20:55:010
638349992320,2cyclictest674748-21apt-get19:45:113
638349992320,2cyclictest674748-21apt-get19:45:103
638349992319,3cyclictest710770-21gpgv20:20:013
638349992318,4cyclictest928868-21kworker/u8:0+flush-259:000:00:003
638349992316,5cyclictest773091-21latency_hist21:20:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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