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2025-05-05 - 00:04

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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 rack3slot3s.osadl.org (updated Sun May 04, 2025 12:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1003301211659,53sleep30-21swapper/307:05:103
100330028754,9sleep20-21swapper/207:05:102
100496328654,9sleep10-21swapper/107:09:291
100473928458,20sleep00-21swapper/007:06:360
1005132993126,3cyclictest1208992-21sendmail12:00:002
1005140993026,1cyclictest0-21swapper/312:20:003
1005132993026,2cyclictest1187235-21perf11:40:012
1005132993025,3cyclictest1054372-21munin-run09:09:592
1005132992925,3cyclictest1005127-21cyclictest07:55:012
1005140992824,2cyclictest0-21swapper/312:05:153
100514099272,18cyclictest1110443-21chrt10:15:123
1005132992721,3cyclictest0-21swapper/212:20:012
1005132992719,5cyclictest1028820-21uname08:05:172
1005140992521,2cyclictest0-21swapper/311:55:243
1005140992520,2cyclictest0-21swapper/311:09:053
100513299258,14cyclictest1-21systemd11:15:002
1005132992521,2cyclictest1132012-21strings10:40:182
1005132992521,2cyclictest1009506-21sh07:20:002
1005132992521,2cyclictest0-21swapper/210:40:012
1005132992521,2cyclictest0-21swapper/209:10:212
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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