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2026-07-19 - 01:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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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 rack3slot3s.osadl.org (updated Sat Jul 18, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
188409421350,1sleep00-21swapper/00
181382921300,1sleep01813827-21ssh0
1540565212379,40sleep30-21swapper/33
154060429788,6sleep20-21swapper/22
154051428453,12sleep10-21swapper/11
154047328259,17sleep00-21swapper/00
154099199273,8cyclictest1605768-21taskset3
1540991992212,6cyclictest0-21swapper/33
154099199221,16cyclictest0-21swapper/33
18027022211,15sleep11803253-21grep1
154099199211,16cyclictest0-21swapper/33
154099199211,15cyclictest0-21swapper/33
154099199211,15cyclictest0-21swapper/33
19560642202,7sleep01956915-21cat0
16013812201,7sleep21602723-21tr2
1540991992017,1cyclictest0-21swapper/33
154099199201,15cyclictest0-21swapper/33
154099199201,15cyclictest0-21swapper/33
154099199200,16cyclictest0-21swapper/33
154099199200,14cyclictest0-21swapper/33
1540991991914,3cyclictest66950irq/132-enp1s0-TxRx-33
154099199191,2cyclictest0-21swapper/33
154099199191,15cyclictest0-21swapper/33
154099199191,14cyclictest1959992-21chrt3
154099199191,14cyclictest0-21swapper/33
154099199191,14cyclictest0-21swapper/33
154099199191,14cyclictest0-21swapper/33
154099199191,14cyclictest0-21swapper/33
154099199191,14cyclictest0-21swapper/33
154099199191,14cyclictest0-21swapper/33
154099199191,13cyclictest0-21swapper/33
154099199190,16cyclictest0-21swapper/33
20079492181,11sleep22009244-21grep2
16817492181,3sleep10-21swapper/11
154099199181,15cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,14cyclictest0-21swapper/33
154099199181,13cyclictest0-21swapper/33
154099199181,13cyclictest0-21swapper/33
154099199181,13cyclictest0-21swapper/33
154099199181,13cyclictest0-21swapper/33
154099199181,13cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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