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2026-09-07 - 08:51

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 highest latencies:
System rack5slot7s.osadl.org (updated Mon Sep 07, 2026 00:45:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14142224532218,87sleep00-21swapper19:06:420
145589917029,19cyclictest0-21swapper22:45:410
145589916221,28cyclictest29161-21diskstats23:55:360
145589916018,23cyclictest20529-21apt-get19:42:010
145589916017,119cyclictest5917-21users21:31:080
145589915718,25cyclictest11906-21apt-get22:10:200
145589915716,99cyclictest23152-21munin-run20:00:030
145589915716,119cyclictest17530-21diskstats19:25:350
145589915715,117cyclictest15026-21latency_hist22:30:010
145589915619,24cyclictest6758-21munin-run21:40:020
145589915618,24cyclictest16501-21munin-run19:20:010
145589915612,29cyclictest19897-21tr23:00:030
145589915610,25cyclictest7573-21apt-get21:46:300
145589915417,109cyclictest31293-21apt-get20:50:190
145589915414,20cyclictest30564-21apt-get00:06:160
145589915413,26cyclictest19524-21sort19:36:000
145589915337,22cyclictest27734-21/usr/sbin/munin23:46:310
145589915330,102cyclictest17373-21head22:41:050
145589915319,25cyclictest20864-21apt-get19:45:270
145589915314,38cyclictest11224-21diskstats22:05:330
145589915310,25cyclictest9479-21latency_hist21:55:050
145589915310,118cyclictest27104-21unixbench_singl20:21:040
145589915310,117cyclictest24461-21awk23:25:570
145589915218,106cyclictest2044-21apt-get21:10:220
145589915214,23cyclictest31589-21apt-get00:11:220
145589915214,115cyclictest25830-21irqstats20:15:410
145589915214,115cyclictest1721-21users00:21:070
145589915214,101cyclictest1940-21apt21:10:020
145589915212,25cyclictest9493-21/usr/sbin/munin21:55:350
145589915210,41cyclictest29581-21run-parts20:40:010
145589915134,21cyclictest2957-21ntpq00:30:480
145589915130,23cyclictest15407-21wc19:15:050
145589915115,21cyclictest26312-21munin-run23:40:020
145589915114,113cyclictest31152-21users20:46:070
145589915114,112cyclictest15789-21users22:31:090
145589915113,28cyclictest20692-21cron23:05:000
145589915110,26cyclictest17317-21munin-run19:25:010
145589915110,116cyclictest30649-21apt-key00:05:070
145589915022,101cyclictest451-21apt-get21:00:210
145589915017,24cyclictest32325-21memory20:55:520
145589915015,31cyclictest27195-21sshd23:45:080
145589915015,111cyclictest5159-21apt21:30:020
145589914933,23cyclictest19018-21sshd22:52:080
145589914929,22cyclictest0-21swapper23:31:000
145589914921,27cyclictest10317-21apt-get22:00:200
145589914918,19cyclictest0-21swapper20:05:250
145589914915,26cyclictest3771-21df21:20:240
145589914840,88cyclictest18690-21mailstats19:31:000
145589914819,28cyclictest21602-21apt-get23:10:190
145589914817,106cyclictest12879-21irqstats22:15:400
145589914815,19cyclictest28570-21cut20:30:590
145589914812,27cyclictest16610-21modprobe22:40:000
14558991479,23cyclictest23841-21head23:21:050
14558991478,118cyclictest27797-21kworker/u2:1800:15:140
145589914719,24cyclictest20807-21apt-get23:05:190
145589914718,103cyclictest23274-21apt-get20:00:230
145589914716,26cyclictest27286-21/usr/sbin/munin20:26:000
145589914716,107cyclictest13977-21systemctl22:20:560
145589914713,20cyclictest4154-21munin-run00:40:030
145589914713,113cyclictest24821-1kworker/u3:423:50:190
145589914616,24cyclictest24988-21/usr/sbin/munin20:10:360
14558991459,111cyclictest21653-21/usr/sbin/munin19:50:470
145589914515,22cyclictest6882-21apt-get21:40:210
145589914515,107cyclictest3550-21munin-run21:20:050
145589914513,108cyclictest1935-21cstates00:25:230
145589914512,109cyclictest30481-21sort20:45:050
145589914418,27cyclictest23052-21users23:16:080
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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