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2022-12-02 - 08:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #8

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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x86 Intel Xeon E3-1230 v2 @3300 MHz, Linux 4.19.1-rt3 (Profile)

Latency plot of shadow in rack #c, slot #8
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 20 highest latencies:
System rackcslot8s.osadl.org (updated Fri Dec 02, 2022 00:46:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
125391640,5ptp4l0-21swapper/419:08:134
125391620,31ptp4l0-21swapper/019:06:070
2012626049,6sleep20-21swapper/219:08:072
142132570,0sleep00-21swapper/021:13:240
2024125139,7sleep60-21swapper/619:09:396
2012525139,7sleep10-21swapper/119:08:061
2019125039,6sleep30-21swapper/319:08:563
2025124937,7sleep70-21swapper/719:09:497
2002024735,7sleep50-21swapper/519:06:505
125391310,0ptp4l0-21swapper/122:35:191
125391310,0ptp4l0-21swapper/000:15:180
125391300,0ptp4l0-21swapper/121:25:151
125391300,0ptp4l0-21swapper/021:43:530
125391300,0ptp4l0-21swapper/020:40:110
125391300,0ptp4l0-21swapper/000:30:200
125391300,0ptp4l0-21swapper/000:01:320
125391290,0ptp4l0-21swapper/321:45:523
125391290,0ptp4l0-21swapper/122:22:431
125391290,0ptp4l0-21swapper/023:23:580
125391280,1ptp4l11375-21diskmemload21:17:540
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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