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2024-04-25 - 18:00

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 - 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.
Unexpectedly long latencies may be caused by SMIs
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 Thu Apr 25, 2024 12:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
68332630,0sleep70-21swapper/709:14:107
62422620,0sleep10-21swapper/109:12:281
1389915948,6phc2sys0-21swapper/607:09:186
115322590,0sleep10-21swapper/111:40:241
114342570,0sleep20-21swapper/208:15:182
125391560,5ptp4l0-21swapper/107:05:271
43992550,0sleep40-21swapper/409:55:264
1215925341,7sleep70-21swapper/707:09:177
125391510,5ptp4l0-21swapper/507:06:245
1186225040,6sleep30-21swapper/307:05:293
1190924934,10sleep40-21swapper/407:06:014
1030424736,6sleep20-21swapper/207:05:042
70562450,0sleep40-21swapper/409:14:474
1202324534,7sleep00-21swapper/007:07:340
125391340,0ptp4l0-21swapper/011:50:210
125391330,0ptp4l0-21swapper/011:25:250
125391310,0ptp4l0-21swapper/510:10:395
125391310,0ptp4l0-21swapper/111:11:141
125391310,0ptp4l0-21swapper/110:25:191
125391310,0ptp4l0-21swapper/109:35:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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