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2025-09-18 - 00:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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
Compare latency of primary with shadow system
Characteristics of the 10 highest latencies:
System rackeslot4s.osadl.org (updated Wed Sep 17, 2025 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2987370993631,3cyclictest3101986-21gpgv09:00:003
2987363993630,4cyclictest3170083-21latency_hist10:05:012
2987370993330,2cyclictest3185761-21kworker/u8:4+flush-259:010:35:193
2987370993128,2cyclictest3236997-21kworker/u8:3+flush-259:011:50:193
2987363993126,3cyclictest3117786-21latency_hist09:15:012
2987354993125,5cyclictest2987091-21latency_hist07:10:010
2987358993026,3cyclictest3226929-21kworker/u8:2+flush-259:011:25:001
2987354993025,4cyclictest2987098-21apt-get07:10:020
2987358992925,3cyclictest3236997-21kworker/u8:3+flush-259:011:15:261
2987358992923,5cyclictest3086200-21apt-get08:42:551
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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