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2026-04-10 - 05:43

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 Apr 10, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2498382224161,49sleep40-21swapper/419:09:454
2498112219162,19sleep50-21swapper/519:09:235
2496382213183,19sleep30-21swapper/319:06:553
2497472209177,20sleep60-21swapper/619:08:286
2495682208175,21sleep70-21swapper/719:05:567
2497692205176,18sleep10-21swapper/119:08:471
2497592205170,22sleep00-21swapper/019:08:380
2497252203176,17sleep20-21swapper/219:08:082
3753072560,0sleep351-21ksoftirqd/322:45:153
250092992925,4cyclictest285288-21dump-pmu-power20:10:005
25009299280,22cyclictest251644-21awk19:10:175
25009299270,22cyclictest345789-21munin-run21:55:005
25009299270,1cyclictest0-21swapper/523:25:015
25009899258,4cyclictest0-21swapper/720:42:297
25009299250,1cyclictest369322-21apt-get22:35:135
25009299250,1cyclictest369322-21apt-get22:35:135
25008799250,25cyclictest264005-21chrt19:30:183
25008799250,1cyclictest0-21swapper/323:20:013
250081992521,1cyclictest271428-21apt-get19:45:121
25008199250,22cyclictest316710-21munin-run21:04:591
25008199250,21cyclictest0-21swapper/123:40:131
25009899240,23cyclictest310979-21turbostat20:55:007
25009599240,23cyclictest262384-21munin-run19:30:006
25009599240,23cyclictest252823-21munin-run19:15:016
25009599240,23cyclictest0-21swapper/622:00:126
25009299240,24cyclictest0-21swapper/522:30:005
25008999240,23cyclictest0-21swapper/423:10:124
25008799242,1cyclictest0-21swapper/323:00:003
25008399240,23cyclictest412557-21perf23:50:002
25008399240,23cyclictest0-21swapper/222:45:152
25008399240,23cyclictest0-21swapper/221:25:112
250081992420,1cyclictest0-21swapper/119:30:131
25008199240,23cyclictest0-21swapper/121:45:131
25008199240,22cyclictest0-21swapper/119:35:121
25007799240,23cyclictest0-21swapper/022:10:120
250098992321,1cyclictest280000-21apt-get20:00:127
25009899230,22cyclictest397734-21apt-get23:25:017
25009899230,22cyclictest0-21swapper/719:20:117
25009899230,1cyclictest0-21swapper/723:25:137
25009899230,1cyclictest0-21swapper/721:40:127
250095992321,1cyclictest291425-21apt-get20:20:116
25009599230,22cyclictest0-21swapper/621:45:006
25009599230,22cyclictest0-21swapper/621:00:006
25009599230,22cyclictest0-21swapper/600:30:016
250092992320,3cyclictest0-21swapper/523:10:115
25009299230,22cyclictest274276-21apt-get19:50:115
25009299230,22cyclictest0-21swapper/520:00:125
25009299230,22cyclictest0-21swapper/500:10:005
25009299230,0cyclictest302852-21apt-get20:40:115
25009299230,0cyclictest0-21swapper/519:45:135
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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