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2026-04-08 - 22:34

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot4s.osadl.org (updated Wed Apr 08, 2026 12:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1757055997568,6cyclictest1912429-21dpkg09:37:243
1757045995047,2cyclictest75-21kswapd009:37:230
1757045993733,3cyclictest1996616-21apt-get11:00:110
1757045993629,5cyclictest2043058-21latency_hist11:45:000
1757055993531,3cyclictest1933577-21kworker/u8:0+flush-259:010:20:013
1757045993530,4cyclictest1782504-21kworker/u8:1+events_unbound07:40:000
1757045993530,4cyclictest1782504-21kworker/u8:1+events_unbound07:40:000
1757048993428,4cyclictest1949244-21apt-get10:15:101
1757045993430,3cyclictest1985648-21kworker/u8:2+events_unbound11:25:170
1757053993329,3cyclictest1980441-21gpgv10:45:012
1757045993229,2cyclictest1938705-21kworker/u8:1+events_unbound10:10:180
1757045993228,3cyclictest1839521-21kworker/u8:1+flush-259:009:15:170
1757053993125,4cyclictest1959544-21/usr/sbin/munin10:25:152
1757055993025,4cyclictest1990963-21gpgv10:55:003
1757055992923,4cyclictest1813803-21latency_hist08:05:013
1757048992926,2cyclictest75-21kswapd009:37:211
1757048992924,3cyclictest2079429-21apt-get12:20:101
1757048992924,3cyclictest2079429-21apt-get12:20:101
1757045992925,3cyclictest1923281-21kworker/u8:4+flush-259:010:20:150
1757045992923,4cyclictest252-21systemd-journal08:37:540
1757053992824,3cyclictest1933577-21kworker/u8:0+flush-259:010:30:182
1757045992724,2cyclictest1722914-21kworker/u8:0+flush-259:007:25:230
1757045992623,2cyclictest1918046-21kworker/u8:3+flush-259:009:45:210
1757045992622,3cyclictest1933577-21kworker/u8:0+flush-259:011:50:190
1757045992622,3cyclictest1912378-21kworker/u8:2+flush-259:009:40:200
1757045992622,3cyclictest1808650-21kworker/u8:2+flush-259:008:25:240
1757053992521,2cyclictest1788050-21kworker/u8:0+flush-259:007:45:202
1757053992520,4cyclictest1839521-21kworker/u8:1+flush-259:008:50:042
1757048992520,4cyclictest1985868-21apt-get10:50:101
1757053992420,3cyclictest2006679-21kworker/u8:1+events_unbound11:20:002
1757048992419,3cyclictest1923279-21kworker/u8:1+events_unbound09:49:591
1757045992421,2cyclictest2006679-21kworker/u8:1+flush-259:011:15:220
1757045992421,2cyclictest1933577-21kworker/u8:0+flush-259:011:30:180
1757045992421,2cyclictest1808650-21kworker/u8:2+flush-259:008:05:240
1757045992420,3cyclictest2063956-21kworker/u8:0+flush-259:012:20:170
1757045992420,3cyclictest2063956-21kworker/u8:0+flush-259:012:20:170
1757045992420,3cyclictest1933577-21kworker/u8:0+events_unbound10:58:240
1757045992420,2cyclictest1865575-21kworker/u8:0+flush-259:009:20:240
1757055992318,4cyclictest1937819-21ntpq10:00:213
1757053992319,3cyclictest2043082-21kworker/u8:3+flush-259:012:00:242
1757053992317,4cyclictest252-21systemd-journal07:45:002
1757045992320,2cyclictest2063956-21kworker/u8:0+events_unbound12:35:260
1757045992319,3cyclictest2063956-21kworker/u8:0+flush-259:012:15:180
1757045992319,3cyclictest2063956-21kworker/u8:0+flush-259:012:15:180
1757045992319,3cyclictest2043082-21kworker/u8:3+events_unbound12:03:280
1757045992319,3cyclictest1979621-21kworker/u8:3+events_unbound10:45:140
1757045992319,3cyclictest1839521-21kworker/u8:1+flush-259:008:55:190
1757055992218,3cyclictest1933577-21kworker/u8:0+flush-259:011:50:163
1757055992217,3cyclictest2022500-21latency_hist11:25:013
1757053992216,4cyclictest252-21systemd-journal09:37:132
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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