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2026-06-30 - 22:32

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 20 highest latencies:
System rack5slot4s.osadl.org (updated Tue Jun 30, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
110495721980,2sleep3481ktimers/311:05:213
93400321840,2sleep375-21kworker/3:1-events08:15:173
866600996056,3cyclictest861527-21kworker/u8:0+events_unbound07:20:301
866600995952,5cyclictest861527-21kworker/u8:0+events_unbound07:30:281
866600995952,5cyclictest1097665-21latency_hist11:00:011
866598995948,8cyclictest1017879-21latency_hist09:40:010
866598995948,8cyclictest1017879-21latency_hist09:40:000
866600995752,4cyclictest861527-21kworker/u8:0+events_unbound07:25:311
866600995751,4cyclictest1177887-21kworker/u8:3+events_unbound12:25:281
866598995743,10cyclictest1062503-21apt-get10:25:010
866600995650,5cyclictest1012799-21kworker/u8:3+flush-8:009:55:261
866598995650,4cyclictest1012799-21kworker/u8:3+flush-8:009:45:310
866600995548,5cyclictest952337-21kworker/u8:2+flush-8:008:40:251
866600995448,4cyclictest973073-21kworker/u8:3+flush-8:009:10:281
866600995448,4cyclictest1110386-21kworker/u8:1+events_unbound12:35:311
866600995447,5cyclictest1057537-21kworker/u8:0+events_unbound10:40:241
866600995347,3cyclictest992458-21kworker/u8:1+events_unbound10:20:311
866600995346,5cyclictest1110386-21kworker/u8:1+events_unbound11:10:281
866598995343,8cyclictest1081666-21ntpq10:40:230
866600995248,3cyclictest861527-21kworker/u8:0+events_unbound07:15:301
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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