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2026-09-18 - 13:52

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 Fri Sep 18, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21524021210,3sleep10-21swapper/122:44:091
16182750,7chrt0-21swapper/119:09:111
2713995644,9cyclictest278-21systemd-journal20:20:000
2713995244,6cyclictest242769-21latency_hist23:10:010
1266412510,1sleep0126642-21grep21:14:080
2718995039,8cyclictest273038-21latency_hist23:40:011
2713994945,3cyclictest3351787-21kworker/u8:4+flush-8:019:20:010
2713994740,5cyclictest133739-21latency_hist21:20:010
2718994541,2cyclictest168435-21idleruntime-cro21:55:001
2713994534,8cyclictest203800-21/usr/sbin/munin22:34:080
1797062450,6sleep20-21swapper/222:09:082
2718994336,5cyclictest3351787-21kworker/u8:4+flush-8:019:14:031
2713994336,5cyclictest76828-21kworker/u8:2+flush-8:020:49:090
2713994332,8cyclictest262840-21apt-get23:30:010
2713994332,8cyclictest152904-21ntpq21:39:100
2713994236,4cyclictest257804-21kworker/u8:0+flush-8:000:39:020
2718994134,5cyclictest139267-21apt-get21:28:581
2713994135,4cyclictest76828-21kworker/u8:2+flush-8:020:39:150
2713994135,4cyclictest76828-21kworker/u8:2+flush-8:020:39:150
2720994022,16cyclictest278-21systemd-journal21:39:372
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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