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2025-03-17 - 08:45

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 Mon Mar 17, 2025 00:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
26845992713,14cyclictest0-21swapper/320:15:393
2683399274,22cyclictest0-21swapper/019:45:370
2684599250,24cyclictest6604-21apt-get20:45:363
2683999250,24cyclictest2423-21turbostat00:30:011
26845992422,1cyclictest15009-21taskset22:20:343
26841992423,0cyclictest0-21swapper/223:10:372
2683999240,23cyclictest5444-21apt-get00:35:021
2683999240,23cyclictest16645-21turbostat.cron20:00:001
2684599230,22cyclictest18314-21awk21:10:003
2684599230,22cyclictest0-21swapper/322:30:003
26841992322,0cyclictest11401-21apt-get23:30:372
2684199230,2cyclictest8693-21ls23:24:592
26839992321,1cyclictest17117-21munin-run22:24:591
26833992323,0cyclictest0-21swapper/020:30:360
2683399230,22cyclictest22621-21munin-plugin-st22:40:000
26845992221,0cyclictest0-21swapper/322:05:393
26845992220,1cyclictest593-21dbus-daemon23:40:013
26845992220,1cyclictest593-21dbus-daemon19:54:593
26845992220,1cyclictest3892-21awk20:40:003
26845992220,1cyclictest11207-21perf19:45:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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