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2026-01-09 - 13:34

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 here to display the system's profile data or here to proceed to next system.
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 Fri Jan 09, 2026 00:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
34323282235172,22sleep60-21swapper/619:08:166
34322492225186,26sleep40-21swapper/419:07:104
34321692225168,19sleep70-21swapper/719:06:007
34323052211176,21sleep10-21swapper/119:07:551
34324272209175,21sleep30-21swapper/319:09:423
34322452208175,21sleep00-21swapper/019:07:050
34321942208174,21sleep50-21swapper/519:06:225
34323242204172,21sleep20-21swapper/219:08:132
343267299270,26cyclictest3499247-21turbostat.cron21:05:000
343269299250,24cyclictest3490675-21dump-pmu-power20:50:006
343269299250,1cyclictest3606251-21apt-get00:10:136
3432683992525,0cyclictest0-21swapper/321:05:123
3432676992524,1cyclictest0-21swapper/120:30:121
3432672992519,5cyclictest3620406-21turbostat00:35:010
343267299250,24cyclictest0-21swapper/020:00:090
343269499240,23cyclictest0-21swapper/719:30:107
343269299240,23cyclictest3565734-21systemctl22:59:596
343269299240,23cyclictest3453711-21apt-get19:45:136
3432688992421,3cyclictest3560039-21awk22:49:595
343268699240,23cyclictest3605836-21perf00:10:004
343268699240,23cyclictest3507823-21systemctl21:20:004
343268399241,22cyclictest0-21swapper/319:55:123
3432681992423,0cyclictest0-21swapper/222:20:112
3432681992422,1cyclictest3574283-21apt23:15:002
3432672992419,4cyclictest3470418-21munin-run20:15:000
343269499230,22cyclictest3569012-21apt-get23:05:137
343269299230,22cyclictest3545903-21apt-get22:25:116
343269299230,22cyclictest3539916-21apt-get22:15:136
343269299230,22cyclictest3479004-21awk20:30:006
343269299230,22cyclictest3479004-21awk20:30:006
343269299230,1cyclictest0-21swapper/623:40:016
343268899230,22cyclictest0-21swapper/521:55:005
343268899230,22cyclictest0-21swapper/500:20:105
3432686992322,0cyclictest0-21swapper/422:44:594
3432686992321,1cyclictest0-21swapper/419:15:004
343268699230,22cyclictest3551195-21awk22:34:594
3432683992323,0cyclictest0-21swapper/322:20:013
343268399230,2cyclictest3551192-21perf22:35:003
343268399230,23cyclictest0-21swapper/321:30:013
3432681992322,1cyclictest411ktimers/222:45:002
3432681992321,1cyclictest0-21swapper/220:20:112
343268199230,22cyclictest0-21swapper/223:00:122
343268199230,22cyclictest0-21swapper/220:00:102
343268199230,1cyclictest0-21swapper/222:20:002
3432676992321,1cyclictest3597565-21apt-get23:55:111
3432676992321,1cyclictest3516653-21perf21:35:001
343267699230,22cyclictest3467568-21munin-run20:10:011
343267699230,22cyclictest0-21swapper/120:50:111
343267699230,21cyclictest0-21swapper/122:50:121
343267299230,22cyclictest3574713-21apt-get23:15:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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