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2025-11-15 - 06:38

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 Nov 15, 2025 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2989778993831,4cyclictest3120978-21cp21:15:002
2989778993531,2cyclictest3162610-21kworker/u8:3+flush-259:022:25:162
2989773993329,3cyclictest3136817-21kworker/u8:3+flush-259:021:30:201
2989782993226,4cyclictest3000402-21cp19:20:003
2989765993227,4cyclictest3120906-21gpgv21:15:010
2989773993127,3cyclictest3078806-21kworker/u8:3+flush-259:021:10:181
2989773993127,3cyclictest3068666-21kworker/u8:2+flush-259:020:45:001
2989765993025,4cyclictest3115343-21apt-get21:10:000
2989778992926,2cyclictest3266445-21kworker/u8:3+flush-259:023:35:272
2989782992720,5cyclictest3188523-21latency_hist22:20:013
2989778992723,3cyclictest3168013-21kworker/u8:0+flush-259:000:25:202
2989778992720,5cyclictest3224571-21latency_hist22:55:012
2989778992720,5cyclictest3094721-21latency_hist20:50:002
2989773992723,3cyclictest3251038-21apt-get23:20:121
2989765992724,2cyclictest3136817-21kworker/u8:3+flush-259:021:40:000
2989778992624,1cyclictest3209144-21latency_hist22:40:012
2989778992623,2cyclictest3168013-21kworker/u8:0+events_unbound22:50:002
2989773992620,4cyclictest2698871-21systemd-journal22:34:441
2989778992521,3cyclictest3068666-21kworker/u8:2+events_unbound21:05:222
2989778992519,5cyclictest3292153-21kworker/u8:1+flush-259:000:35:152
2989773992521,3cyclictest2698871-21systemd-journal21:20:001
2989765992521,3cyclictest3147545-21diskstats21:40:140
2989765992520,3cyclictest2698871-21systemd-journal21:35:000
2989778992420,3cyclictest3042042-21kworker/u8:0+events_unbound20:35:162
2989773992420,3cyclictest3047130-21gpgv20:05:011
2989773992418,4cyclictest2698871-21systemd-journal19:50:011
2989773992417,5cyclictest2698871-21systemd-journal23:09:591
2989765992418,4cyclictest3126494-21latency_hist21:20:000
2989782992318,3cyclictest3214289-21kworker/u8:1+flush-259:022:45:173
2989778992320,2cyclictest3068666-21kworker/u8:2+events_unbound21:00:162
2989778992319,3cyclictest3168014-21kworker/u8:2+flush-259:022:00:162
2989778992319,3cyclictest2974428-21kworker/u8:0+events_unbound19:20:182
2989765992318,4cyclictest3089282-21cat20:45:000
2989765992317,5cyclictest3317696-21latency_hist00:25:000
2989782992218,3cyclictest3245405-21kworker/u8:2+flush-259:023:35:013
2989778992219,2cyclictest3276489-21kworker/u8:2+flush-259:023:50:262
2989778992219,2cyclictest3042042-21kworker/u8:0+events_unbound20:05:192
2989778992219,2cyclictest3021212-21kworker/u8:1+flush-259:020:00:212
2989778992219,2cyclictest2989706-21kworker/u8:1+events_unbound19:16:362
2989778992219,2cyclictest2974428-21kworker/u8:0+events_unbound19:30:452
2989778992218,3cyclictest3230369-21kworker/u8:4+flush-259:023:10:012
2989778992218,3cyclictest3168013-21kworker/u8:0+flush-259:000:15:202
2989778992218,3cyclictest3110204-21kworker/u8:1+flush-259:021:50:212
2989778992215,5cyclictest2698871-21systemd-journal00:30:022
2989773992218,3cyclictest3328760-21apt-get00:35:111
2989765992217,4cyclictest3021212-21kworker/u8:1+flush-259:020:20:170
2989765992217,3cyclictest2995142-21apt-get19:15:120
2989782992116,3cyclictest3276739-21apt-get23:45:123
2989778992118,2cyclictest3214289-21kworker/u8:1+events_unbound23:15:282
2989778992118,2cyclictest3021212-21kworker/u8:1+events_unbound19:50:182
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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