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2025-10-31 - 17:22

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 Fri Oct 31, 2025 12:44:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
473999241,0cyclictest151rcu_preempt08:45:163
4729992424,0cyclictest13614-21apt-get08:35:171
472599240,23cyclictest9057-21sleep10:40:010
472599240,23cyclictest16764-21munin-run07:35:000
473999230,22cyclictest31837-21perf10:20:003
473999230,1cyclictest0-21swapper/307:20:013
473999230,0cyclictest0-21swapper/311:10:153
4731992322,1cyclictest0-21swapper/207:45:162
4731992320,2cyclictest10746-21munin-plugin-st11:50:002
473199230,22cyclictest9522-21idleruntime-cro07:20:012
473199230,22cyclictest13324-21sh08:34:592
472599231,1cyclictest0-21swapper/010:19:590
4739992220,1cyclictest30828-21apt-get09:10:163
473999220,21cyclictest15308-21apt-get09:45:143
473999220,21cyclictest10731-21dump-pmu-power11:49:593
473999220,21cyclictest0-21swapper/311:05:173
473999220,21cyclictest0-21swapper/310:35:173
473999220,21cyclictest0-21swapper/308:50:163
473999220,1cyclictest612-21gdbus08:35:003
473999220,1cyclictest0-21swapper/312:10:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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