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2026-05-15 - 05:54

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 Fri May 15, 2026 00:44:41)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1017672241167,22sleep40-21swapper/419:06:074
1019582226167,19sleep60-21swapper/619:08:506
1019322222184,25sleep00-21swapper/019:08:290
1018982221183,25sleep20-21swapper/219:07:592
1019682220186,22sleep70-21swapper/719:09:007
1018152220182,26sleep50-21swapper/519:06:495
1019822219182,23sleep30-21swapper/319:09:123
1018322218188,20sleep10-21swapper/119:07:011
15279621440,0sleep5152795-21apt-config20:31:235
102255993126,4cyclictest191465-21cat21:40:005
10225599310,18cyclictest0-21swapper/522:41:455
10225899280,22cyclictest0-21swapper/620:20:016
10225899270,0cyclictest0-21swapper/619:55:126
102258992621,1cyclictest165349-21apt-get20:55:126
10225899260,21cyclictest0-21swapper/623:45:006
10224999260,25cyclictest106275-21apt-get19:15:123
10224999260,25cyclictest106275-21apt-get19:15:123
10225999250,24cyclictest220941-21apt22:29:597
10225999250,24cyclictest0-21swapper/719:30:117
102258992521,1cyclictest138701-21apt-get20:10:116
10225899250,24cyclictest0-21swapper/600:30:026
102253992523,1cyclictest2538442sleep423:25:124
102253992520,4cyclictest247547-21munin-run23:15:004
102249992522,3cyclictest105286-21latency_hist19:15:013
10224999250,24cyclictest0-21swapper/300:20:123
10224799250,24cyclictest111765-21awk19:25:002
10224799250,24cyclictest111765-21awk19:25:002
10224499250,24cyclictest253466-21taskset23:25:001
10224499250,24cyclictest253466-21taskset23:25:001
10224499250,24cyclictest0-21swapper/123:50:131
10225899240,1cyclictest218428-21apt-get22:25:106
10225899240,1cyclictest159469-21apt-get20:45:126
10225399240,24cyclictest176707-21cron21:15:004
10225399240,23cyclictest241675-21awk23:05:004
102249992423,1cyclictest789-21dbus-daemon20:40:013
10224999240,24cyclictest220965-21awk22:30:003
102247992423,1cyclictest262760-21apt-get23:40:122
10224799240,1cyclictest0-21swapper/223:00:202
10224799240,1cyclictest0-21swapper/200:10:132
102244992423,1cyclictest229827-21922:45:001
10224499240,23cyclictest0-21swapper/122:30:171
102259992322,1cyclictest227277-21apt-get22:40:127
10225999230,22cyclictest224318-21apt-get22:35:137
10225999230,22cyclictest153092-21sh20:35:017
10225999230,22cyclictest0-21swapper/723:50:137
10225999230,22cyclictest0-21swapper/721:30:127
10225899230,22cyclictest280439-21apt-get00:10:126
10225899230,22cyclictest0-21swapper/622:55:036
10225599236,4cyclictest0-21swapper/520:18:585
10225599230,22cyclictest262273-21apt-get23:40:025
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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