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2025-08-21 - 21:35

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 Thu Aug 21, 2025 12:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
379737121950,3sleep375-21kworker/3:1+events09:40:363
388584221770,5sleep30-21swapper/311:10:313
38520242980,2chrt0-21swapper/210:35:362
3641452995442,9cyclictest3774830-21latency_hist09:20:011
3641448995444,7cyclictest3925770-21latency_hist11:50:010
3641448995342,8cyclictest3704158-21latency_hist08:10:010
3641448995342,8cyclictest276-21systemd-journal08:30:000
3641452995142,6cyclictest3945803-21latency_hist12:10:001
3641448995143,6cyclictest3885295-21kworker/u8:0+flush-8:011:50:470
3641448995141,7cyclictest3769809-21latency_hist09:15:010
3641448995044,4cyclictest3850281-21systemctl10:35:000
3641452994940,7cyclictest3820473-21/usr/sbin/munin10:05:401
3641452994940,6cyclictest3749566-21latency_hist08:55:001
3641452994937,10cyclictest276-21systemd-journal07:30:381
3641448994638,4cyclictest3940789-21kworker/u8:1+flush-8:012:20:330
3641452994424,17cyclictest276-21systemd-journal09:53:371
3641448994439,4cyclictest3653727-21kworker/u8:3+flush-8:007:35:340
3641448994438,4cyclictest3825212-21latency_hist10:10:010
3641448994437,5cyclictest3598103-21kworker/u8:0+flush-8:007:40:440
3641448994435,6cyclictest3693838-21latency_hist08:00:010
3641448994433,9cyclictest276-21systemd-journal11:31:450
3641454994334,6cyclictest3764986-21cp09:10:022
3641452994335,6cyclictest3739180-40mandb08:41:371
3641448994336,5cyclictest3648732-21apt-get07:15:290
3641448994332,8cyclictest276-21systemd-journal11:05:000
3641452994233,7cyclictest3658828-21/usr/sbin/munin07:25:411
3641448994135,4cyclictest3698898-21kworker/u8:1+flush-8:010:25:310
3641448994135,4cyclictest3698898-21kworker/u8:1+flush-8:010:25:310
3641452994028,10cyclictest3960773-21apt-get12:24:401
3641452994025,12cyclictest3719791-21diskstats08:25:331
364145299400,8cyclictest3734290-21bash08:39:341
3641452993830,6cyclictest3834310-21ntpq10:15:401
364145299372,33cyclictest0-21swapper/110:30:441
3641452993721,14cyclictest3769508-21journal-offline09:11:191
3641452993719,16cyclictest276-21systemd-journal11:40:371
364145299370,6cyclictest3714513-21apt-get08:20:271
3641448993732,4cyclictest3698898-21kworker/u8:1+flush-8:010:57:370
3641448993726,9cyclictest3774945-21cp09:20:020
3641454993627,7cyclictest276-21systemd-journal08:37:372
364145299363,6cyclictest0-21swapper/112:10:281
364145299363,16cyclictest0-21swapper/107:50:301
3641448993629,5cyclictest3653727-21kworker/u8:3+flush-8:007:30:300
3641454993527,5cyclictest3704395-21kworker/u8:2+flush-8:008:10:422
3641452993515,18cyclictest3678773-21awk07:45:001
3641448993529,4cyclictest3765024-21kworker/u8:3+events_unbound11:10:450
3641448993528,5cyclictest3765024-21kworker/u8:3+flush-8:011:35:300
36412652353,9sleep10-21swapper/107:09:421
3641454993427,5cyclictest3784673-21grep09:25:472
364145299343,5cyclictest0-21swapper/111:55:271
364145299343,5cyclictest0-21swapper/110:40:281
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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