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2026-04-14 - 03:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 50 highest latencies:
System rack8slot4s.osadl.org (updated Tue Apr 14, 2026 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
37976182231170,20sleep60-21swapper/619:07:276
37976282228171,45sleep70-21swapper/719:07:367
37976062224164,20sleep30-21swapper/319:07:163
37975732211178,21sleep20-21swapper/219:06:502
37977382208173,22sleep50-21swapper/519:09:115
37976222208176,21sleep10-21swapper/119:07:291
37976162208173,22sleep40-21swapper/419:07:254
37975352206172,21sleep00-21swapper/019:06:170
3798031992826,1cyclictest3850888-21cron20:40:014
379803999270,25cyclictest0-21swapper/720:10:007
379802599270,26cyclictest3833512-21latency_hist20:10:002
379803699260,25cyclictest3800775-21awk19:15:006
3798016992623,2cyclictest3969165-21sh00:05:000
379802799250,24cyclictest3883130-21sleep21:35:013
379802799250,24cyclictest3839228-21perf20:20:003
3798025992522,2cyclictest3923107-21idleruntime-cro22:45:002
379802199250,24cyclictest0-21swapper/120:40:121
3798039992422,1cyclictest653-21mta-sts-daemon19:35:117
379803999240,2cyclictest3874315-21idleruntime-cro21:20:017
379803699240,23cyclictest3952221-21packagekitd23:34:596
379803399240,23cyclictest0-21swapper/520:00:005
379803199240,22cyclictest3813325-21fwupd19:34:334
3798027992423,0cyclictest0-21swapper/320:25:133
3798027992423,0cyclictest0-21swapper/320:25:123
3798027992422,1cyclictest0-21swapper/321:00:133
3798027992421,3cyclictest3880025-21awk21:30:013
379802799240,23cyclictest0-21swapper/323:35:003
3798025992421,2cyclictest3839256-21grep20:19:592
379802599240,2cyclictest3874276-21sendmail21:20:002
379802599240,23cyclictest3880168-21cat21:30:012
379802599240,23cyclictest3812915-21apt-get19:34:342
379802599240,1cyclictest3833931-21apt-get20:10:102
379802199240,22cyclictest3862599-21munin-run21:00:011
3798039992321,1cyclictest3923108-21turbostat.cron22:45:007
379803999230,22cyclictest0-21swapper/723:05:127
379803999230,22cyclictest0-21swapper/722:55:007
379803999230,1cyclictest3909259-21apt-get22:20:127
3798036992321,1cyclictest0-21swapper/622:25:196
379803699230,22cyclictest0-21swapper/622:55:116
379803399230,22cyclictest0-21swapper/500:35:125
379803199230,2cyclictest3966250-21cut00:00:004
379803199230,22cyclictest0-21swapper/422:40:114
379803199230,22cyclictest0-21swapper/400:10:114
379803199230,0cyclictest0-21swapper/421:10:124
3798027992321,1cyclictest3909259-21apt-get22:20:123
379802799230,22cyclictest3923536-21apt-get22:45:123
379802799230,22cyclictest0-21swapper/323:20:123
3798025992320,2cyclictest3871439-21idleruntime-cro21:15:012
379802599230,22cyclictest0-21swapper/223:05:132
3798021992321,1cyclictest0-21swapper/121:25:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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