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2026-04-13 - 11:39

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 Apr 13, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
783999280,0cyclictest0-21swapper/021:39:300
784499270,0cyclictest0-21swapper/121:39:301
783999270,23cyclictest2658-21diskmemload22:18:000
783999270,0cyclictest0-21swapper/021:29:280
7844992624,1cyclictest0-21swapper/123:22:321
784499260,1cyclictest22849-21perl23:04:301
7839992622,4cyclictest0-21swapper/020:14:280
7839992620,5cyclictest0-21swapper/021:24:280
7844992521,3cyclictest6035-21apt-get20:14:281
7844992520,4cyclictest15944-21apt-get21:24:281
784499250,24cyclictest15409-21apt-get23:29:281
784499250,21cyclictest0-21swapper/123:39:471
7839992522,3cyclictest2658-21diskmemload00:10:290
783999250,24cyclictest0-21swapper/021:47:390
783999250,21cyclictest6904-21apt-get22:49:280
783999250,21cyclictest0-21swapper/023:30:400
783999250,1cyclictest0-21swapper/022:28:590
785499240,24cyclictest0-21swapper/322:23:223
785499240,23cyclictest605-21avahi-daemon19:40:003
785499240,23cyclictest2658-21diskmemload00:39:543
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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