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2026-03-10 - 04:08

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #7

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: 50.5 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 rack5slot7s.osadl.org (updated Tue Mar 10, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32143224352202,89sleep00-21swapper19:07:180
324909916316,49cyclictest18002-21apt-get21:00:560
324909916316,107cyclictest12491-21apt-get23:46:590
324909916122,27cyclictest31190-21apt-get22:20:210
324909916012,39cyclictest29463-21apt22:10:000
324909915918,116cyclictest18328-21munin-run00:20:020
324909915917,23cyclictest383-21apt-get22:30:270
324909915913,41cyclictest20737-21/usr/sbin/munin21:15:490
324909915820,28cyclictest27266-21diskstats21:55:340
324909915812,117cyclictest19152-21/usr/sbin/munin21:05:120
324909915720,25cyclictest12515-21apt-get20:25:220
324909915717,24cyclictest7779-21df19:55:260
324909915713,120cyclictest8472-21munin-run23:20:020
32490991569,123cyclictest6865-21munin-run23:10:000
324909915616,26cyclictest14312-21apt23:55:000
324909915615,120cyclictest22365-21apt-get21:25:180
324909915613,121cyclictest110-21systemd-journal20:15:020
324909915613,119cyclictest12550-21ls23:45:060
324909915515,115cyclictest27977-21apt-get22:00:180
324909915429,16cyclictest0-21swapper22:50:520
324909915419,26cyclictest10977-21apt-get23:35:150
324909915411,118cyclictest16026-21/usr/sbin/munin00:05:110
324909915340,20cyclictest10149-21sort23:30:050
324909915315,22cyclictest13548-21memory20:30:500
324909915314,115cyclictest16821-21apt-get00:10:190
324909915313,112cyclictest5798-21grep23:00:560
324909915312,27cyclictest2093-21/usr/sbin/munin19:20:400
324909915312,25cyclictest25188-21gzip21:40:550
324909915312,117cyclictest16361-21head20:46:040
324909915311,117cyclictest32690-21/usr/sbin/munin19:10:280
324909915310,119cyclictest21116-21grep00:35:480
324909915310,118cyclictest24375-21wc21:35:570
324909915214,110cyclictest2964-21apt-get22:45:220
324909915211,26cyclictest5305-21latency_hist23:00:060
324909915211,118cyclictest32682-21munin-run22:30:050
324909915210,118cyclictest15542-21grep00:00:480
324909915127,20cyclictest9657-21wc20:05:570
324909915116,111cyclictest18762-21ntp_states00:20:490
324909915115,94cyclictest7501-21/usr/sbin/munin23:11:010
324909915113,112cyclictest4473-21/usr/sbin/munin19:35:340
324909915112,116cyclictest3794-21diskstats19:30:310
324909915110,41cyclictest19250-21sshd00:25:200
324909915018,107cyclictest6999-21diskstats19:50:360
324909915016,22cyclictest1976-21munin-run19:20:020
324909915015,109cyclictest21570-21/usr/sbin/munin21:20:520
324909915013,38cyclictest11602-21munin-run20:20:030
32490991499,31cyclictest12144-21find20:20:560
324909914919,104cyclictest16624-21diskstats20:50:350
324909914918,26cyclictest14414-21apt-get23:55:220
324909914917,107cyclictest14921-21/usr/sbin/munin20:40:110
324909914915,110cyclictest30256-21apt22:15:010
32490991488,23cyclictest20495-21mailstats00:30:580
324909914825,105cyclictest31986-21kworker/u2:522:35:170
324909914817,23cyclictest23159-21apt-get21:30:180
324909914815,22cyclictest9192-21apt20:05:010
324909914813,34cyclictest30358-21apt-get22:15:180
324909914714,26cyclictest17302-21/usr/sbin/munin20:55:410
324909914711,24cyclictest10874-21munin-plugin-st23:35:000
324909914710,115cyclictest26939-21sort21:51:020
324909914627,21cyclictest0-21swapper19:25:570
324909914615,109cyclictest2173-21apt-get22:40:170
324909914612,22cyclictest26261-21munin-run21:50:010
32490991459,39cyclictest20130-21uname21:10:420
324909914517,24cyclictest8696-21df23:20:260
324909914516,23cyclictest14343-21memory20:35:460
324909914514,22cyclictest5297-21/usr/sbin/munin19:40:490
324909914513,107cyclictest6097-21sshd19:45:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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