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2026-07-05 - 01:21

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 Sat Jul 04, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2990552750,5sleep1291ktimers/111:30:121
37729997060,7cyclictest248843-21latency_hist10:40:021
2907902670,5chrt0-21swapper/211:20:182
2129112610,4chrt0-21swapper/110:00:191
37729995955,3cyclictest313620-21kworker/u8:2+flush-8:012:30:261
37729995646,7cyclictest348630-21latency_hist12:20:011
37726995650,4cyclictest298168-21kworker/u8:1+flush-8:011:40:290
2503552560,2chrt75-21kworker/3:1+events10:40:193
37726995550,4cyclictest119688-21kworker/u8:0+flush-8:008:30:240
2035322550,4chrt0-21swapper/109:50:281
37729995448,4cyclictest243633-21kworker/u8:0+events_unbound11:20:301
37732995233,16cyclictest1704890-21systemd-journal10:35:002
37732995128,6cyclictest1704890-21systemd-journal11:54:592
37729995146,4cyclictest2878278-21kworker/u8:2+flush-8:007:15:271
37729995145,4cyclictest2878278-21kworker/u8:2+flush-8:009:30:291
37729995143,5cyclictest368456-21latency_hist12:40:001
37729995141,8cyclictest104090-21apt-get08:15:011
653532500,3sleep10-21swapper/107:35:161
37732995029,6cyclictest1704890-21systemd-journal11:35:002
37732994930,7cyclictest234197-21apt-get10:25:082
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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