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2026-08-16 - 03:19

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 Aug 15, 2026 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3090634994843,3cyclictest335557-21systemd-journal10:30:010
3090634994741,4cyclictest3407356-21latency_hist12:15:000
3090634994335,6cyclictest3376411-21latency_hist11:45:000
3090641994234,5cyclictest3153203-21cp08:10:012
3090644994135,4cyclictest3205050-21latency_hist09:00:003
3090641994136,4cyclictest3210229-21kworker/u8:1+flush-259:009:40:262
3090634994135,4cyclictest335557-21systemd-journal10:10:000
3090641994037,2cyclictest3220233-21kworker/u8:0+flush-259:011:40:252
3090641994034,4cyclictest3266994-21kworker/u8:3+flush-259:010:35:012
3090644993935,3cyclictest3314388-21kworker/u8:3+flush-259:010:50:013
3090641993935,3cyclictest3220233-21kworker/u8:0+flush-259:010:25:112
3090641993935,2cyclictest3210229-21kworker/u8:1+events_unbound10:15:232
3090634993834,3cyclictest3210229-21kworker/u8:1+flush-259:011:30:250
3090634993629,4cyclictest3246317-21latency_hist09:40:010
3090634993529,4cyclictest3350591-21latency_hist11:20:000
3090639993430,3cyclictest3309428-21apt-get10:40:111
3090634993430,3cyclictest3220233-21kworker/u8:0+flush-259:011:25:230
3090641993329,3cyclictest3381351-21kworker/u8:2+events_unbound11:50:192
3090641993329,3cyclictest3210229-21kworker/u8:1+events_unbound11:30:252
3090639993326,5cyclictest3110402-21ntpq07:25:211
3090641993229,2cyclictest3116287-21kworker/u8:2+flush-259:009:05:232
3090641993229,2cyclictest1033607-21kworker/u8:4+flush-259:008:35:232
3090641993229,2cyclictest1033607-21kworker/u8:4+flush-259:007:15:152
3090641993228,3cyclictest3319589-21kworker/u8:4+events_unbound11:09:312
3090641993227,3cyclictest3220233-21kworker/u8:0+events_unbound09:15:212
3090634993225,5cyclictest335557-21systemd-journal10:35:170
3090644993127,3cyclictest335557-21systemd-journal07:56:263
3090641993127,3cyclictest3381351-21kworker/u8:2+events_unbound12:38:412
3090639993128,2cyclictest3298808-21kworker/u8:2+flush-259:010:40:011
3090634993126,4cyclictest3418297-21kworker/u8:0+events_unbound12:30:230
3090634993125,4cyclictest3433525-21latency_hist12:40:010
3090644993026,3cyclictest3210229-21kworker/u8:1+flush-259:010:30:013
3090641993026,3cyclictest3220233-21kworker/u8:0+events_unbound11:25:222
3090641993025,3cyclictest3116287-21kworker/u8:2+flush-259:009:20:212
3090639993026,3cyclictest3220233-21kworker/u8:0+flush-259:010:50:251
3090634993024,4cyclictest3385801-21ntpq11:50:210
3090641992925,3cyclictest3366025-21kworker/u8:3+flush-259:012:10:202
3090641992925,3cyclictest1033607-21kworker/u8:4+flush-259:008:50:222
3090641992924,3cyclictest3106097-21latency_hist07:25:012
3090639992926,2cyclictest3116287-21kworker/u8:2+flush-259:008:55:251
3090639992925,3cyclictest3319589-21kworker/u8:4+flush-259:011:15:231
3090639992924,4cyclictest3366025-21kworker/u8:3+flush-259:011:50:171
3090634992925,3cyclictest3210229-21kworker/u8:1+flush-259:011:10:170
3090634992923,4cyclictest3418491-21diskstats12:25:150
3090644992825,2cyclictest1033607-21kworker/u8:4+flush-259:008:40:003
3090644992824,3cyclictest335557-21systemd-journal07:16:263
3090641992824,3cyclictest3381351-21kworker/u8:2+events_unbound11:55:212
3090641992824,3cyclictest3366025-21kworker/u8:3+events_unbound12:20:012
3090641992824,3cyclictest3116287-21kworker/u8:2+events_unbound08:16:292
3090641992824,3cyclictest1033607-21kworker/u8:4+flush-259:008:25:152
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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