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2026-04-11 - 23:10

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 Apr 11, 2026 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2999015994946,2cyclictest3065392-21kworker/u8:1+events_unbound08:30:251
2999011994640,4cyclictest3201067-21diskstats10:25:160
2999011994238,3cyclictest2983725-21kworker/u8:0+flush-259:007:40:200
2999022994036,3cyclictest3004018-21kworker/u8:2+flush-259:007:30:183
2999018993732,4cyclictest3004018-21kworker/u8:2+flush-259:009:05:222
2999011993731,4cyclictest3159448-21latency_hist09:45:010
2999018993630,4cyclictest3279837-21/usr/sbin/munin11:40:122
2999018993630,4cyclictest3004018-21kworker/u8:2+flush-259:008:15:172
2999011993631,3cyclictest252-21systemd-journal10:40:000
2999018993531,3cyclictest3174897-21kworker/u8:0+flush-259:011:10:012
2999018993429,3cyclictest3205780-21kworker/u8:3+flush-259:011:55:212
2999015993431,2cyclictest3004018-21kworker/u8:2+flush-259:009:10:311
2999022993327,4cyclictest3025376-21/usr/sbin/munin07:35:163
2999018993226,4cyclictest252-21systemd-journal07:36:502
2999015993223,8cyclictest3128519-21kworker/u8:0+flush-259:009:30:221
2999011993127,3cyclictest509-21rs:main0
2999011993127,3cyclictest509-21rs:main0
2999015993026,3cyclictest3004018-21kworker/u8:2+flush-259:008:25:231
2999011993026,3cyclictest3113273-21apt-get09:00:120
2999011993024,4cyclictest3009234-21apt-get07:20:000
2999011993024,4cyclictest252-21systemd-journal09:28:510
2999022992923,4cyclictest3179094-21ntpq10:00:213
2999018992926,2cyclictest2983725-21kworker/u8:0+flush-259:007:55:172
2999015992824,3cyclictest3274700-21apt-get11:35:111
2999015992823,3cyclictest252-21systemd-journal11:07:511
2999022992724,2cyclictest3118808-21kworker/u8:3+flush-259:009:10:153
2999018992723,3cyclictest3128519-21kworker/u8:0+events_unbound09:35:182
2999018992722,4cyclictest3065392-21kworker/u8:1+flush-259:008:30:172
2999018992722,3cyclictest3341670-21gpgv12:40:002
2999015992724,2cyclictest3065392-21kworker/u8:1+flush-259:008:50:191
2999011992724,2cyclictest3004018-21kworker/u8:2+flush-259:007:30:260
2999011992723,3cyclictest3004018-21kworker/u8:2+flush-259:009:10:230
2999011992723,2cyclictest3004018-21kworker/u8:2+events_unbound07:35:170
2999011992720,5cyclictest3086067-21ntpq08:30:230
2999022992620,4cyclictest3009468-21cat07:20:003
2999022992620,4cyclictest2998941-21latency_hist07:10:003
2999015992623,2cyclictest3138782-21kworker/u8:1+events_unbound10:30:181
2999015992623,2cyclictest3004018-21kworker/u8:2+flush-259:008:10:161
2999015992623,2cyclictest2940824-21kworker/u8:1+events_unbound07:15:171
2999015992621,4cyclictest3336643-21apt-get12:35:131
2999015992621,3cyclictest252-21systemd-journal11:34:511
2999011992622,3cyclictest3242649-21kworker/u8:1+events_unbound11:25:130
2999011992622,3cyclictest3205780-21kworker/u8:3+flush-259:012:25:000
2999011992622,3cyclictest2983725-21kworker/u8:0+events_unbound08:10:130
2999011992620,4cyclictest3232435-21base6410:55:000
2999011992619,5cyclictest3168889-21ntpq09:50:220
2999022992519,4cyclictest3149392-21apt-get09:35:123
2999018992521,3cyclictest3205780-21kworker/u8:3+flush-259:011:30:002
2999018992521,3cyclictest3004018-21kworker/u8:2+flush-259:009:25:202
2999018992520,3cyclictest3004018-21kworker/u8:2+flush-259:008:25:152
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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