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2026-05-21 - 21:43

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 rack8slot4s.osadl.org (updated Thu May 21, 2026 12:44:41)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
18079832253175,63sleep70-21swapper/707:08:367
18080622237199,25sleep30-21swapper/307:09:443
18079442236196,25sleep60-21swapper/607:08:026
18079602227162,20sleep20-21swapper/207:08:132
18078882224191,22sleep40-21swapper/407:07:124
18080422221180,26sleep10-21swapper/107:09:251
18079472221187,23sleep00-21swapper/007:08:040
18077762217184,22sleep50-21swapper/507:05:365
180830499290,28cyclictest0-21swapper/711:25:187
180830099286,4cyclictest18295452sleep507:43:505
180830499270,22cyclictest0-21swapper/712:20:197
180828799270,3cyclictest1856228-21cron08:30:000
180830499260,22cyclictest1819607-21ntpq07:25:187
180830399260,5cyclictest1890380-21ntpq09:25:176
1808298992620,4cyclictest1835541-21munin-plugin-st07:54:594
180829299260,25cyclictest1888694-21perf09:25:012
180829299260,25cyclictest1888694-21perf09:25:012
180830499250,24cyclictest1868472-21apt-get08:50:117
180830499250,24cyclictest0-21swapper/709:35:127
180830499250,24cyclictest0-21swapper/708:15:137
180830499250,21cyclictest0-21swapper/709:00:127
180830499250,21cyclictest0-21swapper/708:30:197
180828999250,25cyclictest1828451-21awk07:40:171
1808304992423,1cyclictest0-21swapper/711:05:117
1808304992418,6cyclictest0-21swapper/710:45:017
180830499240,23cyclictest0-21swapper/712:00:127
180830499240,23cyclictest0-21swapper/711:50:107
180830499240,1cyclictest0-21swapper/710:15:137
180830499240,1cyclictest0-21swapper/707:35:157
180830499240,0cyclictest0-21swapper/711:30:107
180830399240,1cyclictest1939260-21apt-get10:50:136
180829899240,1cyclictest0-21swapper/411:20:114
180829499241,23cyclictest0-21swapper/312:39:593
180829499240,23cyclictest1838967-21apt-get08:00:113
180829499240,23cyclictest0-21swapper/309:55:113
180829499240,23cyclictest0-21swapper/307:40:123
1808292992422,1cyclictest2003779-21munin-run12:40:002
180829299240,23cyclictest1924530-21apt-get10:25:122
180829299240,23cyclictest1821218-21apt-get07:30:122
180829299240,23cyclictest0-21swapper/212:00:102
180829299240,23cyclictest0-21swapper/208:25:122
180829299240,23cyclictest0-21swapper/208:05:112
180829299240,1cyclictest1846159-21ntpq08:10:182
180828799240,23cyclictest1959707-21sed11:25:000
180828799240,1cyclictest0-21swapper/012:30:000
1808304992322,1cyclictest1903851-21apt-get09:50:127
1808304992321,2cyclictest1909752-21apt-get10:00:137
1808304992321,1cyclictest0-21swapper/709:10:137
1808304992320,3cyclictest0-21swapper/711:45:147
180830499230,22cyclictest1955251-21ntpq11:15:177
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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