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2026-03-28 - 18:10

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 Sat Mar 28, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
40819012125105,12sleep20-21swapper/22
4081828211954,60sleep30-21swapper/33
408164928653,12sleep10-21swapper/11
408180527455,14sleep00-21swapper/00
1110432301,4sleep0111224-21ssh0
408212299231,19cyclictest0-21swapper/33
408212299220,19cyclictest0-21swapper/33
1333152221,8sleep0133325-21sh0
4082122992119,1cyclictest0-21swapper/33
4082122992115,4cyclictest0-21swapper/33
632092201,7sleep163239-21ssh1
408212299209,8cyclictest368920-21chrt3
408212299203,13cyclictest0-21swapper/33
408212299201,7cyclictest4105005-21chrt3
408212299201,15cyclictest0-21swapper/33
408212299201,15cyclictest0-21swapper/33
408212299201,15cyclictest0-21swapper/33
1551702200,15sleep119034-21diskmemload1
41802922191,6sleep24180352-21sendmail-msp2
408212299199,6cyclictest4137507-21taskset3
4082122991915,2cyclictest0-21swapper/33
4082122991912,5cyclictest0-21swapper/33
4082122991912,4cyclictest0-21swapper/33
408212299191,15cyclictest0-21swapper/33
408212299191,15cyclictest0-21swapper/33
408212299191,14cyclictest0-21swapper/33
408212299191,14cyclictest0-21swapper/33
408212299191,14cyclictest0-21swapper/33
408212299191,14cyclictest0-21swapper/33
408212299191,14cyclictest0-21swapper/33
408212299190,15cyclictest0-21swapper/33
519772182,8sleep119034-21diskmemload1
4082122991812,3cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,14cyclictest0-21swapper/33
408212299181,13cyclictest4153341-21taskset3
408212299181,13cyclictest0-21swapper/33
408212299181,13cyclictest0-21swapper/33
4082122991810,5cyclictest281570-21taskset3
408212299180,15cyclictest0-21swapper/33
408212299180,14cyclictest0-21swapper/33
408212299180,14cyclictest0-21swapper/33
408212299171,4cyclictest0-21swapper/33
4082122991713,2cyclictest0-21swapper/33
408212299171,15cyclictest0-21swapper/33
4082122991711,4cyclictest0-21swapper/33
4082122991711,4cyclictest0-21swapper/33
408212299171,14cyclictest0-21swapper/33
408212299171,14cyclictest0-21swapper/33
4082122991711,3cyclictest0-21swapper/33
408212299171,13cyclictest0-21swapper/33
408212299171,13cyclictest0-21swapper/33
408212299171,13cyclictest0-21swapper/33
408212299171,12cyclictest0-21swapper/33
408212299170,14cyclictest0-21swapper/33
408212299170,14cyclictest0-21swapper/33
408212299170,13cyclictest0-21swapper/33
2646912171,3sleep20-21swapper/22
2203362171,3sleep00-21swapper/00
2002952170,7sleep00-21swapper/00
601472161,10sleep119034-21diskmemload1
41205072161,4sleep24120562-21ntpq2
408212299161,12cyclictest0-21swapper/33
408212299161,12cyclictest0-21swapper/33
408212299160,13cyclictest0-21swapper/33
408212299160,13cyclictest0-21swapper/33
3591912161,3sleep00-21swapper/00
2696042161,10sleep2269659-21ntpq2
2475602160,4sleep1321rcuc/11
2460792161,2sleep20-21swapper/22
2080132161,5sleep2208073-21ntpq2
1855382161,10sleep119034-21diskmemload1
1059372161,11sleep2105948-21ssh2
41271152151,3sleep04126908-21fwupd0
41244422151,9sleep04125691-21memory0
41244422151,9sleep04125691-21memory0
41160822151,7sleep24115973-31sort2
408212299151,11cyclictest4121784-21chrt3
408212299151,11cyclictest4121784-21chrt3
4082122991510,3cyclictest0-21swapper/33
408212299150,13cyclictest0-21swapper/33
408212299150,13cyclictest0-21swapper/33
408212299150,12cyclictest0-21swapper/33
408212299150,12cyclictest0-21swapper/33
3838332151,9sleep1383896-21ntpq1
3601572151,4sleep1360169-21ssh1
3174312151,4sleep119034-21diskmemload1
2801652150,3sleep10-21swapper/11
2352612151,2sleep00-21swapper/00
2278712151,3sleep219034-21diskmemload2
1485142151,5sleep1148526-21ssh1
139682151,9sleep214224-21df2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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