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2024-02-24 - 05:10

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack4slot1s.osadl.org (updated Sat Feb 24, 2024 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
153832940,2chrt15365-21sendmail23:01:341
153832940,2chrt15365-21sendmail23:01:341
70402800,2sleep07036-21ntpq21:12:030
70402800,2sleep07036-21ntpq21:12:030
244132730,4sleep30-21swapper/323:22:063
244132730,4sleep30-21swapper/323:22:063
47302640,2sleep00-21swapper/023:57:090
47302640,2sleep00-21swapper/023:57:090
177892630,3sleep00-21swapper/000:32:020
177892630,3sleep00-21swapper/000:32:020
196202590,1sleep00-21swapper/020:21:340
196202590,1sleep00-21swapper/020:21:340
135062580,1sleep013505-21forks00:21:530
299922570,3sleep30-21swapper/319:22:003
299922570,3sleep30-21swapper/319:22:003
259702540,2sleep00-21swapper/023:27:100
259702540,2sleep00-21swapper/023:27:100
157362540,3sleep30-21swapper/320:11:373
2553299523,7cyclictest181rcu_preempt00:21:511
2553299514,5cyclictest181rcu_preempt21:21:551
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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