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2023-12-08 - 01:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 rack0slot8s.osadl.org (updated Thu Dec 07, 2023 12:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2889911000,90ptp4l0-21swapper/107:05:201
94480710,66rtkit-daemon0-21swapper/007:07:130
1425227052,9sleep50-21swapper/507:08:267
1423826555,8sleep40-21swapper/407:08:136
193302610,0sleep90-21swapper/907:55:2211
1434026143,10sleep100-21swapper/1007:09:442
1251726151,7sleep70-21swapper/707:05:279
266332600,0sleep60-21swapper/612:15:358
1409825646,8sleep110-21swapper/1107:06:083
1107125543,10sleep60-21swapper/607:05:028
190022510,0sleep70-21swapper/707:55:209
67902500,1sleep863-21ksoftirqd/810:25:3710
14750992719,8cyclictest0-21swapper/1011:30:232
1475099220,1cyclictest0-21swapper/1009:40:072
288991210,0ptp4l0-21swapper/111:00:291
1470699203,10cyclictest0-21swapper/107:40:011
1470699203,10cyclictest0-21swapper/107:40:011
1475099190,1cyclictest0-21swapper/1008:25:312
1474699192,13cyclictest0-21swapper/912:10:0011
1474699191,17cyclictest0-21swapper/912:25:2611
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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