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2026-03-30 - 17:33

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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  Intel
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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 Mon Mar 30, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
347345421850,3sleep375-21kworker/3:1+events12:11:353
31727052600,2sleep2371rcuc/207:11:322
32838622590,2sleep3481ktimers/309:01:333
32331342580,2sleep1281rcuc/108:11:271
3171347994937,9cyclictest280-21systemd-journal09:30:010
3171355994742,3cyclictest3359572-21kworker/u8:0+events_unbound11:51:332
32218942450,6sleep20-21swapper/207:56:392
3171352994535,8cyclictest3385613-21ntpq10:41:381
3171352994435,6cyclictest280-21systemd-journal08:45:331
316651024428,10sleep10-21swapper/107:05:021
316651024428,10sleep10-21swapper/107:05:021
3171355994238,3cyclictest3267190-21kworker/u8:1+events_unbound10:51:352
3171355994238,3cyclictest3267190-21kworker/u8:1+events_unbound10:51:352
3171347994235,5cyclictest3178380-21kworker/u8:1+flush-8:007:56:290
3171347994235,5cyclictest280-21systemd-journal08:01:210
3171347994233,6cyclictest3207848-21latency_hist07:45:010
3171355994136,4cyclictest3161183-21kworker/u8:3+events_unbound07:31:422
3171355994132,7cyclictest280-21systemd-journal12:02:342
3171352994135,4cyclictest3386192-21kworker/u8:2+flush-8:011:06:341
3171352994132,7cyclictest280-21systemd-journal10:21:331
3171355994035,4cyclictest3213513-21kworker/u8:2+events_unbound09:06:362
3171347994035,4cyclictest3213513-21kworker/u8:2+events_unbound08:15:010
3171355993935,3cyclictest3248105-21kworker/u8:3+flush-8:008:26:442
3171352993928,8cyclictest3406202-21apt-get11:05:011
316765323927,7sleep30-21swapper/307:06:323
316765323927,7sleep30-21swapper/307:06:323
3171352993832,4cyclictest3283919-21journal-offline09:01:331
3171352993830,5cyclictest280-21systemd-journal07:12:301
3171352993828,8cyclictest3296320-21ntpq09:11:381
3171347993831,5cyclictest280-21systemd-journal11:01:530
3171355993733,3cyclictest3213513-21kworker/u8:2+events_unbound07:51:312
3171355993733,3cyclictest3178380-21kworker/u8:1+events_unbound07:16:312
3171352993728,6cyclictest3217739-21latency_hist07:55:011
3171352993527,6cyclictest280-21systemd-journal11:49:331
3171347993530,3cyclictest3389839-21kthreadcore10:46:330
3171347993530,3cyclictest3326810-21idleruntime-cro09:45:000
317134799351,31cyclictest1-21systemd10:35:000
32525472340,4sleep10-21swapper/108:30:011
3171347993423,8cyclictest3188642-21diskstats07:26:290
3171347993327,5cyclictest3267190-21kworker/u8:1+flush-8:010:11:420
3171347993327,4cyclictest3256436-21kworker/u8:0+events_unbound09:00:000
3171347993327,4cyclictest3248105-21kworker/u8:3+events_unbound08:36:340
3171347993325,5cyclictest3440702-21grep11:36:420
3171352993228,3cyclictest3391368-21idleruntime-cro10:50:001
3171352993226,4cyclictest3471050-21apt-get12:11:251
3171347993227,3cyclictest3292118-21cron09:10:000
3171347993222,8cyclictest3267440-21latency_hist08:45:010
3171347993222,8cyclictest3193576-21diskstats07:31:260
3171347993219,10cyclictest280-21systemd-journal08:46:330
3171355993127,3cyclictest3256436-21kworker/u8:0+events_unbound08:31:382
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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