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2026-05-10 - 20:56

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 Sun May 10, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1241298213057,69sleep30-21swapper/33
124134728152,10sleep20-21swapper/22
124150327964,9sleep10-21swapper/11
124134027454,14sleep00-21swapper/00
1241777992218,2cyclictest0-21swapper/33
124177799221,17cyclictest1465265-21taskset3
124177799213,14cyclictest0-21swapper/33
1241777992117,2cyclictest0-21swapper/33
124177799211,16cyclictest0-21swapper/33
124177799207,10cyclictest1702481-21turbostat3
124177799207,10cyclictest1702481-21turbostat3
124177799202,14cyclictest0-21swapper/33
1241777992011,7cyclictest0-21swapper/33
124177799201,16cyclictest1659615-21taskset3
124177799201,15cyclictest1665175-21taskset3
124177799201,15cyclictest0-21swapper/33
124177799201,15cyclictest0-21swapper/33
124177799200,18cyclictest0-21swapper/33
124177799200,17cyclictest66950irq/132-enp1s0-TxRx-33
124177799191,15cyclictest0-21swapper/33
124177799191,15cyclictest0-21swapper/33
124177799191,14cyclictest0-21swapper/33
124177799191,14cyclictest0-21swapper/33
124177799191,13cyclictest1340779-21taskset3
124177799190,17cyclictest0-21swapper/33
124177799190,16cyclictest0-21swapper/33
15334622181,8sleep21533473-21ssh2
14951152180,4sleep0221rcuc/00
13152182181,6sleep21316905-21kthreadcore2
124177799182,11cyclictest1357226-21taskset3
1241777991816,1cyclictest0-21swapper/33
1241777991815,1cyclictest0-21swapper/33
1241777991814,2cyclictest0-21swapper/33
124177799181,14cyclictest0-21swapper/33
124177799181,14cyclictest0-21swapper/33
124177799181,14cyclictest0-21swapper/33
124177799181,14cyclictest0-21swapper/33
124177799181,14cyclictest0-21swapper/33
124177799181,14cyclictest0-21swapper/33
124177799181,14cyclictest0-21swapper/33
124177799181,14cyclictest0-21swapper/33
124177799181,13cyclictest0-21swapper/33
124177799181,13cyclictest0-21swapper/33
124177799181,13cyclictest0-21swapper/33
124177799181,13cyclictest0-21swapper/33
124177799181,13cyclictest0-21swapper/33
17248852171,3sleep20-21swapper/22
16909912170,1sleep20-21swapper/22
14470002177,7sleep11241772-21cyclictest1
13793762171,3sleep00-21swapper/00
1241777991713,2cyclictest0-21swapper/33
124177799171,14cyclictest66950irq/132-enp1s0-TxRx-33
124177799171,14cyclictest0-21swapper/33
124177799171,13cyclictest0-21swapper/33
124177799171,13cyclictest0-21swapper/33
124177799171,13cyclictest0-21swapper/33
124177799171,13cyclictest0-21swapper/33
124177799171,12cyclictest0-21swapper/33
124177799170,15cyclictest0-21swapper/33
124177799170,14cyclictest0-21swapper/33
17238742160,3sleep10-21swapper/11
14877242161,9sleep01487788-21ntpq0
14816832161,10sleep11372931-21diskmemload1
124177799168,4cyclictest13452892sleep33
124177799164,10cyclictest0-21swapper/33
124177799160,13cyclictest0-21swapper/33
124177799160,13cyclictest0-21swapper/33
17182642151,3sleep11372931-21diskmemload1
15487832151,2sleep00-21swapper/00
15336602150,3sleep20-21swapper/22
15308132151,10sleep11530823-21ssh1
15151182151,9sleep21372931-21diskmemload2
15081762151,3sleep01508183-21ssh0
14299912151,4sleep21372931-21diskmemload2
124177799155,8cyclictest1241662-21turbostat3
124177799151,8cyclictest1346589-21taskset3
124177799151,13cyclictest0-21swapper/33
124177799151,10cyclictest1298619-21chrt3
124177799150,13cyclictest0-21swapper/33
124177799150,13cyclictest0-21swapper/33
124177799150,13cyclictest0-21swapper/33
124177799150,12cyclictest0-21swapper/33
124177799150,12cyclictest0-21swapper/33
16735802141,5sleep01673605-21switchtime0
16317332141,2sleep20-21swapper/22
16229742141,9sleep01622985-21ssh0
15755222141,4sleep21575537-21ssh2
15549672141,2sleep01555063-21ntpq0
15223602141,2sleep10-21swapper/11
15173162141,7sleep01517349-21ssh0
14392652141,2sleep20-21swapper/22
14329052140,2sleep10-21swapper/11
14201142141,4sleep21420171-21ntpq2
13860572141,6sleep01386105-21ntpq0
13760502141,8sleep21377289-21memory2
13622722141,9sleep01362289-21sendmail0
12757042141,3sleep11275636-31find1
124177799146,1cyclictest0-21swapper/33
1241777991410,2cyclictest0-21swapper/33
124177799140,12cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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