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2024-11-23 - 17:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Sat Nov 23, 2024 12:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30881992421,2cyclictest7781-21turbostat.cron08:35:002
3088099240,23cyclictest17790-21ls08:55:001
30876992422,1cyclictest6189-21basename11:50:010
3087699240,23cyclictest0-21swapper/007:15:460
3087699240,22cyclictest313-21systemd-journal10:00:000
30882992321,1cyclictest20251-21apt-get10:05:033
30882992321,1cyclictest0-21swapper/309:15:003
3088299230,23cyclictest20305-21perf11:10:003
3088299230,1cyclictest7786-21apt-get08:35:183
3088199232,1cyclictest0-21swapper/207:40:462
30881992321,1cyclictest1125-21apt-get07:15:462
3088099230,2cyclictest8578-21idleruntime-cro11:55:001
3088099230,22cyclictest20621-21perf12:20:001
3088099230,22cyclictest15795-21cron12:10:001
30876992320,1cyclictest313-21systemd-journal07:45:000
3087699230,2cyclictest8311-21grep10:45:000
3087699230,22cyclictest28981-21turbostat11:30:000
30882992222,0cyclictest0-21swapper/309:40:473
30882992220,1cyclictest28250-21perf12:35:003
30882992220,1cyclictest2652-21dpkg09:30:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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