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2025-12-10 - 22:34

OSADL QA Farm on Real-time of Mainline Linux

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

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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  Congatec
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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 rackeslot8s.osadl.org (updated Wed Dec 10, 2025 12:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
9171639912071,1202cyclictest12819602sleep33
9171639912050,1201cyclictest1338689-21sleep3
917163994140,411cyclictest1103353-21turbostat3
917163993070,303cyclictest1216800-21turbostat3
917163992118,1cyclictest0-21swapper/33
917163991917,1cyclictest0-21swapper/33
917163991916,1cyclictest0-21swapper/33
91716399186,10cyclictest1306299-21turbostat3
190898180,2rtkit-daemon14-21ksoftirqd/00
91716399178,0cyclictest0-21swapper/33
91716399177,7cyclictest1241342-21turbostat3
91716399172,11cyclictest1052463-21chrt3
917163991715,1cyclictest0-21swapper/33
91716399171,4cyclictest0-21swapper/33
91716399165,9cyclictest1347058-21turbostat3
91716399165,8cyclictest11760882sleep33
91716399164,9cyclictest1353988-21taskset3
91716399161,4cyclictest0-21swapper/33
91716399161,4cyclictest0-21swapper/33
917163991613,1cyclictest0-21swapper/33
917163991613,1cyclictest0-21swapper/33
917163991613,1cyclictest0-21swapper/33
10796922161,5sleep01079899-21hddtemp_smartct0
9235362151,4sleep10-21swapper/11
91716399157,0cyclictest0-21swapper/33
91716399156,6cyclictest10206572sleep33
91716399151,4cyclictest0-21swapper/33
91716399151,3cyclictest0-21swapper/33
917163991513,1cyclictest0-21swapper/33
917163991512,1cyclictest0-21swapper/33
917163991512,1cyclictest0-21swapper/33
917163991512,1cyclictest0-21swapper/33
91716399151,11cyclictest1208777-21chrt3
91716399151,11cyclictest1119722-21turbostat3
91716399151,10cyclictest1103355-21sleep3
91716399148,0cyclictest0-21swapper/33
91716399147,0cyclictest0-21swapper/33
91716399141,9cyclictest937710-21taskset3
91716399141,9cyclictest1406314-21taskset3
91716399141,3cyclictest0-21swapper/33
917163991413,1cyclictest0-21swapper/33
917163991413,0cyclictest0-21swapper/33
917163991412,1cyclictest0-21swapper/33
917163991412,1cyclictest0-21swapper/33
917163991412,1cyclictest0-21swapper/33
917163991412,1cyclictest0-21swapper/33
917163991412,0cyclictest0-21swapper/33
917163991411,1cyclictest0-21swapper/33
91716399141,10cyclictest1135178-21taskset3
91716399141,10cyclictest1071270-21chrt3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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