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2026-04-13 - 16:39

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 100 highest latencies:
System rack3slot3s.osadl.org (updated Mon Apr 13, 2026 12:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
280378212158,59sleep30-21swapper/33
28057028772,10sleep20-21swapper/22
28048428057,6sleep00-21swapper/00
28054927861,11sleep10-21swapper/11
6624412520,4sleep2662408-21ssh2
6714812300,3sleep30-21swapper/33
3099782231,11sleep1309954-31find1
280753992117,2cyclictest0-21swapper/33
280753992116,3cyclictest0-21swapper/33
28075399211,16cyclictest772319-21taskset3
28075399211,15cyclictest677778-21taskset3
280753992110,8cyclictest0-21swapper/33
5945402201,7sleep2411849-21diskmemload2
4788652202,9sleep1411849-21diskmemload1
28075399202,13cyclictest553192-21chrt3
280753992017,1cyclictest0-21swapper/33
280753992016,2cyclictest0-21swapper/33
280753992016,2cyclictest0-21swapper/33
280753992014,3cyclictest481471-21taskset3
28075399201,16cyclictest0-21swapper/33
28075399201,16cyclictest0-21swapper/33
28075399200,16cyclictest655869-21chrt3
28075399200,12cyclictest0-21swapper/33
28075399194,13cyclictest628995-21taskset3
28075399191,15cyclictest0-21swapper/33
28075399191,15cyclictest0-21swapper/33
28075399191,15cyclictest0-21swapper/33
28075399191,15cyclictest0-21swapper/33
28075399191,14cyclictest0-21swapper/33
28075399191,14cyclictest0-21swapper/33
28075399191,14cyclictest0-21swapper/33
28075399191,14cyclictest0-21swapper/33
28075399191,14cyclictest0-21swapper/33
28075399190,5cyclictest614984-21taskset3
28075399190,5cyclictest614984-21taskset3
5882222180,2sleep00-21swapper/00
28075399183,13cyclictest0-21swapper/33
28075399183,12cyclictest0-21swapper/33
280753991815,2cyclictest0-21swapper/33
280753991814,2cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,14cyclictest0-21swapper/33
28075399181,13cyclictest0-21swapper/33
28075399181,13cyclictest0-21swapper/33
28075399181,11cyclictest0-21swapper/33
280753991810,5cyclictest0-21swapper/33
7340012171,3sleep20-21swapper/22
7174812170,1sleep20-21swapper/22
6461622172,8sleep0646176-21ssh0
6327942171,8sleep2634274-21cut2
5045062171,11sleep1504657-21ntpq1
28075399172,11cyclictest321016-21chrt3
280753991715,1cyclictest0-21swapper/33
28075399171,13cyclictest0-21swapper/33
28075399171,13cyclictest0-21swapper/33
28075399171,13cyclictest0-21swapper/33
28075399170,14cyclictest0-21swapper/33
7545832161,5sleep0411849-21diskmemload0
6922372169,3sleep0692248-21ssh0
6035562161,3sleep20-21swapper/22
5970372161,5sleep1411849-21diskmemload1
4625752161,3sleep00-21swapper/00
4122602161,11sleep2411849-21diskmemload2
28075399169,6cyclictest0-21swapper/33
28075399163,1cyclictest0-21swapper/33
28075399162,4cyclictest3842662sleep33
28075399161,14cyclictest0-21swapper/33
280753991611,3cyclictest0-21swapper/33
28075399160,14cyclictest0-21swapper/33
28075399160,13cyclictest0-21swapper/33
28075399160,13cyclictest0-21swapper/33
28075399160,13cyclictest0-21swapper/33
28075399160,13cyclictest0-21swapper/33
7641442156,2sleep10-21swapper/11
7186772150,3sleep00-21swapper/00
7083392151,3sleep2411849-21diskmemload2
6929992151,9sleep1411849-21diskmemload1
6738282151,3sleep0673842-21ssh0
6592092151,4sleep0660805-21cut0
6100892151,9sleep1610150-21ntpq1
5522712151,3sleep0411849-21diskmemload0
5326722150,2sleep20-21swapper/22
5274362151,10sleep1528872-21grep1
5230292151,4sleep0411849-21diskmemload0
5230292151,4sleep0411849-21diskmemload0
5000422153,1sleep1171rcu_preempt1
4449062151,2sleep20-21swapper/22
4287112151,2sleep20-21swapper/22
28075399158,2cyclictest0-21swapper/33
28075399151,12cyclictest0-21swapper/33
28075399151,12cyclictest0-21swapper/33
28075399150,12cyclictest0-21swapper/33
28075399150,11cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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