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2026-03-16 - 06:01

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 Mar 16, 2026 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1443913211853,60sleep30-21swapper/33
144387528656,11sleep10-21swapper/11
144392828060,14sleep00-21swapper/00
144387627659,11sleep20-21swapper/22
15970552470,5sleep2421rcuc/22
144436499271,23cyclictest0-21swapper/33
144436499261,14cyclictest0-21swapper/33
144436499261,14cyclictest0-21swapper/33
144436499235,13cyclictest0-21swapper/33
144436499234,15cyclictest0-21swapper/33
18033572221,3sleep00-21swapper/00
144436499226,14cyclictest0-21swapper/33
144436499224,14cyclictest0-21swapper/33
144436499223,14cyclictest1610457-21turbostat3
144436499221,16cyclictest0-21swapper/33
144436499220,2cyclictest0-21swapper/33
144436499220,11cyclictest0-21swapper/33
17411462211,3sleep20-21swapper/22
144436499214,13cyclictest0-21swapper/33
144436499213,14cyclictest0-21swapper/33
144436499211,4cyclictest0-21swapper/33
144436499211,16cyclictest1793428-21taskset3
144436499211,16cyclictest0-21swapper/33
144436499211,16cyclictest0-21swapper/33
144436499210,3cyclictest0-21swapper/33
144436499210,3cyclictest0-21swapper/33
144436499210,18cyclictest0-21swapper/33
144436499210,11cyclictest0-21swapper/33
19229262201,5sleep20-21swapper/22
19229262201,5sleep20-21swapper/22
17863232201,6sleep01786348-21apt-get0
144436499208,2cyclictest0-21swapper/33
144436499202,13cyclictest1575358-21turbostat3
144436499201,3cyclictest0-21swapper/33
1444364992013,4cyclictest0-21swapper/33
144436499201,16cyclictest0-21swapper/33
144436499201,15cyclictest1819836-21chrt3
144436499201,15cyclictest0-21swapper/33
144436499201,14cyclictest0-21swapper/33
18980262191,3sleep10-21swapper/11
144436499199,8cyclictest0-21swapper/33
144436499193,14cyclictest0-21swapper/33
144436499191,7cyclictest1516265-21turbostat3
144436499191,5cyclictest66950irq/132-enp1s0-TxRx-33
144436499191,5cyclictest0-21swapper/33
144436499191,4cyclictest0-21swapper/33
1444364991913,3cyclictest0-21swapper/33
144436499191,15cyclictest0-21swapper/33
144436499191,15cyclictest0-21swapper/33
144436499191,15cyclictest0-21swapper/33
144436499191,14cyclictest0-21swapper/33
144436499191,14cyclictest0-21swapper/33
144436499191,14cyclictest0-21swapper/33
144436499191,14cyclictest0-21swapper/33
144436499191,14cyclictest0-21swapper/33
144436499191,14cyclictest0-21swapper/33
144436499190,15cyclictest0-21swapper/33
19424852181,2sleep00-21swapper/00
17071792181,5sleep00-21swapper/00
16954142181,3sleep10-21swapper/11
16616612181,3sleep00-21swapper/00
144436499188,7cyclictest1634630-21taskset3
144436499187,2cyclictest0-21swapper/33
1444364991811,5cyclictest0-21swapper/33
144436499181,15cyclictest0-21swapper/33
144436499181,14cyclictest0-21swapper/33
144436499181,14cyclictest0-21swapper/33
144436499181,14cyclictest0-21swapper/33
144436499181,14cyclictest0-21swapper/33
144436499181,14cyclictest0-21swapper/33
144436499181,13cyclictest0-21swapper/33
18729032171,3sleep00-21swapper/00
18269302171,2sleep20-21swapper/22
17329232170,2sleep00-21swapper/00
17329232170,2sleep00-21swapper/00
144436499178,6cyclictest1532576-21turbostat3
144436499171,13cyclictest0-21swapper/33
144436499170,5cyclictest0-21swapper/33
144436499170,1cyclictest0-21swapper/33
144436499170,1cyclictest0-21swapper/33
18561912160,1sleep00-21swapper/00
1444364991613,1cyclictest0-21swapper/33
144436499161,12cyclictest0-21swapper/33
144436499160,6cyclictest0-21swapper/33
144436499160,13cyclictest0-21swapper/33
144436499160,13cyclictest0-21swapper/33
16815832154,7sleep11682264-21tr1
16278692151,4sleep11575354-21diskmemload1
15369812150,7sleep21532822-21/usr/sbin/munin2
144436499150,13cyclictest0-21swapper/33
144436499150,12cyclictest0-21swapper/33
19352812141,7sleep21935313-21ssh2
17758262140,2sleep20-21swapper/22
17431582141,4sleep01575354-21diskmemload0
17061422141,9sleep2802-21snmpd2
144436499143,7cyclictest0-21swapper/33
144436499140,11cyclictest15002032sleep33
19169492131,7sleep11575354-21diskmemload1
19169492131,7sleep11575354-21diskmemload1
18789332131,3sleep01575354-21diskmemload0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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