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2025-11-28 - 09:22

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 Fri Nov 28, 2025 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2710436994441,2cyclictest2933465-21gpgv22:45:013
2710419994236,4cyclictest2928189-21latency_hist22:40:000
2710432994033,5cyclictest2782771-21latency_hist20:20:002
2710436993328,4cyclictest2902265-21/usr/sbin/munin22:15:143
2710436993227,3cyclictest2767539-21/usr/sbin/munin20:05:163
2710427993227,3cyclictest2824352-21kworker/u8:3+flush-259:021:30:011
2710436993127,3cyclictest2886321-21kworker/u8:0+flush-259:022:05:263
2710427993128,2cyclictest2860408-21kworker/u8:4+flush-259:021:35:261
2710427993024,4cyclictest2814077-21latency_hist20:50:001
2710436992926,2cyclictest2672599-21kworker/u8:0+flush-259:019:15:003
2710427992825,2cyclictest2995987-21kworker/u8:0+flush-259:000:00:201
2710427992822,5cyclictest2746923-21kworker/u8:4+flush-259:019:50:301
2710427992724,2cyclictest2803795-21kworker/u8:2+events_unbound21:05:181
2710419992722,3cyclictest2870702-21latency_hist21:45:010
2710436992623,2cyclictest3032210-21kworker/u8:3+events_unbound00:35:003
2710427992623,2cyclictest2834469-21kworker/u8:0+flush-259:021:10:241
2710427992619,5cyclictest2698871-21systemd-journal20:30:001
2710436992521,3cyclictest2896898-21kworker/u8:1+flush-259:023:05:013
2710427992522,3cyclictest2902256-21kworker/u8:3+flush-259:022:35:001
2710427992521,3cyclictest2939126-21kworker/u8:4+flush-259:022:50:221
2710427992521,3cyclictest2939126-21kworker/u8:4+flush-259:022:50:211
2710427992521,2cyclictest0-21swapper/119:35:001
2710427992520,3cyclictest2757224-21kworker/u8:1+flush-259:020:00:151
2710427992519,4cyclictest3006203-21latency_hist23:55:011
2710419992519,5cyclictest2890876-21ntpq22:00:210
2710436992421,2cyclictest2824352-21kworker/u8:3+flush-259:021:20:013
2710432992417,5cyclictest3037135-21latency_hist00:25:012
2710427992421,2cyclictest3032210-21kworker/u8:3+events_unbound00:30:261
2710427992421,2cyclictest2855221-21kworker/u8:2+flush-259:021:45:161
2710419992419,3cyclictest2698871-21systemd-journal21:28:350
2710419992418,4cyclictest2912770-21diskstats22:25:140
2710436992317,5cyclictest2881408-21latency_hist21:55:013
2710432992319,3cyclictest2933346-21latency_hist22:45:002
2710427992320,2cyclictest2964932-21kworker/u8:1+events_unbound23:35:351
2710427992319,3cyclictest3032210-21kworker/u8:3+flush-259:000:25:201
2710427992319,3cyclictest3000061-21in:imuxsock19:25:001
2710427992318,4cyclictest641903-21kworker/u8:2+events_unbound19:35:171
2710427992317,4cyclictest2949243-21latency_hist23:00:011
2710436992217,4cyclictest2896898-21kworker/u8:1+events_unbound22:55:183
2710432992217,4cyclictest2859463-21ntpq21:30:222
2710432992216,4cyclictest2698871-21systemd-journal21:51:352
2710427992219,2cyclictest2818435-21kworker/u8:1+events_unbound20:57:431
2710427992218,3cyclictest2939126-21kworker/u8:4+flush-259:023:05:181
2710427992218,3cyclictest2896898-21kworker/u8:1+flush-259:022:45:001
2710427992215,5cyclictest2819216-21latency_hist20:55:001
2710419992217,4cyclictest2757234-21/usr/sbin/munin19:55:140
2710436992117,2cyclictest0-21swapper/321:50:003
2710436992116,3cyclictest2792660-21kworker/u8:4+flush-259:020:35:003
2710436992115,4cyclictest2917481-21apt-get22:30:003
271043699210,20cyclictest1-21systemd22:25:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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