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2026-09-16 - 03:25

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot4s.osadl.org (updated Wed Sep 16, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32976121960,2sleep375-21kworker/3:1-events19:19:073
51885421890,3sleep375-21kworker/3:1+events22:29:053
53269321870,2sleep375-21kworker/3:1-events22:40:013
4574832740,3chrt451irq_work/321:24:183
321905996646,7cyclictest567337-21latency_hist23:15:000
321905996050,8cyclictest428082-21cp20:55:010
321908995851,5cyclictest398402-21kworker/u8:3+flush-8:022:09:201
321908995753,3cyclictest547777-21kworker/u8:2+events_unbound22:59:171
321908995650,4cyclictest547777-21kworker/u8:2+flush-8:023:24:191
321910995448,4cyclictest637601-21gpgv00:25:002
321910995448,4cyclictest637601-21gpgv00:25:002
321908995347,4cyclictest378397-21kworker/u8:1+events_unbound20:14:041
321908995246,5cyclictest502393-21kworker/u8:1+flush-8:022:14:141
321908995146,3cyclictest333865-21kworker/u8:0+events_unbound19:34:061
321908995145,5cyclictest613022-21kworker/u8:4+flush-8:000:29:201
321908995046,3cyclictest344106-21kworker/u8:2+events_unbound20:29:091
321908995043,5cyclictest398402-21kworker/u8:3+events_unbound21:09:081
321905995040,7cyclictest507683-21latency_hist22:15:010
321908994940,7cyclictest408095-21latency_hist20:35:011
321905994939,8cyclictest651898-21ntpq00:39:150
321908994844,3cyclictest567296-21kworker/u8:0+events_unbound23:29:021
321908994843,4cyclictest4162117-21kworker/u8:1+events_unbound19:29:081
321908994842,4cyclictest583206-21kworker/u8:1+flush-8:023:39:181
321908994840,6cyclictest617730-21latency_hist00:05:011
321908994840,6cyclictest512638-21latency_hist22:20:011
321905994839,6cyclictest388266-21latency_hist20:15:010
321908994741,4cyclictest321772-21kworker/u8:3+flush-8:019:24:071
321908994740,5cyclictest398402-21kworker/u8:3+events_unbound20:39:041
321908994642,3cyclictest398402-21kworker/u8:3+flush-8:021:29:201
321908994539,5cyclictest462861-21kworker/u8:2+flush-8:021:44:181
321905994538,5cyclictest344106-21kworker/u8:2+flush-8:020:49:060
5856512440,4sleep0585655-21kthreadcore23:34:100
321905994436,5cyclictest612820-21cat00:00:000
321908994339,3cyclictest462861-21kworker/u8:2+flush-8:022:04:071
321908994338,4cyclictest532717-21kworker/u8:1+events_unbound23:14:041
321908994338,4cyclictest398402-21kworker/u8:3+flush-8:021:49:191
321908994338,4cyclictest333865-21kworker/u8:0+events_unbound22:24:141
321908994338,3cyclictest423138-21kworker/u8:1+flush-8:021:04:181
321908994337,4cyclictest602992-21kworker/u8:1+flush-8:023:54:051
321908994330,10cyclictest278-21systemd-journal22:33:251
321908994237,4cyclictest462861-21kworker/u8:2+flush-8:021:39:211
321908994236,5cyclictest532717-21kworker/u8:1+events_unbound23:04:161
321908994236,4cyclictest344106-21kworker/u8:2+flush-8:019:39:171
321908994236,4cyclictest344106-21kworker/u8:2+flush-8:019:39:161
321905994232,8cyclictest398402-21kworker/u8:3+flush-8:020:39:060
321908994137,3cyclictest642611-21kworker/u8:0+events_unbound00:34:031
321908994137,3cyclictest333865-21kworker/u8:0+events_unbound20:09:071
321908994136,4cyclictest613022-21kworker/u8:4+flush-8:000:14:131
321908994136,4cyclictest344106-21kworker/u8:2+events_unbound19:54:041
321908994136,4cyclictest333865-21kworker/u8:0+flush-8:022:49:041
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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