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2023-03-22 - 23:10

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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 
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ARM Broadcom BCM2711 @1500 MHz, Linux 5.10.52-rt47-v7l (Profile)

Latency plot of shadow in rack #7, slot #4
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 -n -a0-2 -p99 -i200 -h400 -t3 -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 20 highest latencies:
System rack7slot4s.osadl.org (updated Wed Mar 22, 2023 12:45:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2665599937,55cyclictest9961-21ssh11:20:170
2665599893,52cyclictest4380-21ssh12:30:160
2665599563,38cyclictest19121-21ssh10:30:180
2665599561,40cyclictest0-21swapper/011:35:200
2665599553,24cyclictest21824-21ssh09:55:180
2665599552,41cyclictest10677-21diskmemload11:15:160
2665599552,37cyclictest0-21swapper/009:30:140
2665599551,38cyclictest0-21swapper/008:40:120
2665599543,39cyclictest13003-21ssh11:40:170
2665599522,38cyclictest0-21swapper/008:30:120
2665599520,41cyclictest0-21swapper/008:55:200
2665599511,40cyclictest15993-21apt-get12:00:160
2665599511,38cyclictest0-21swapper/012:10:130
2665599511,38cyclictest0-21swapper/010:45:170
2665599493,36cyclictest1393-21apt-get10:20:170
2665599483,33cyclictest19069-21apt-get12:20:180
26655994824,17cyclictest22803-21cat11:25:390
2665599471,36cyclictest0-21swapper/010:55:430
2665599413,21cyclictest15813-21ssh11:05:130
2665599411,35cyclictest0-21swapper/011:34:430
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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