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2021-06-20 - 09:17

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #6

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 
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  Asem

Intel(R) Celeron(R) CPU J1900 @ 1.99GHz, Linux 4.19.13-rt10-intel-pk-preempt-rt-asem-1.2.1+ (Profile)

Latency plot of shadow in rack #2, slot #6
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Command line: cyclictest -l100000000 -m -Sp99 -i200 -h400 -q
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 10 highest latencies:
System rack2slot6s.osadl.org (updated Mon Mar 09, 2020 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
159792346338,4sleep20-21swapper/219:33:542
162472319312,4sleep00-21swapper/019:37:220
162912218210,5sleep30-21swapper/319:37:573
162942211204,4sleep10-21swapper/119:37:591
172442660,5sleep21664299cyclictest23:13:362
7272630,2sleep10-21swapper/123:48:311
203822580,4sleep120384-21latency_hist23:23:141
309362480,2sleep30-21swapper/322:33:223
309362480,2sleep30-21swapper/322:33:223
16645992412,2cyclictest20037-21switchtime22:08:283
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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