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2026-03-31 - 13:44

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 31, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31121224482190,97sleep00-21swapper19:08:060
313809916117,23cyclictest5046-21apt-get23:01:590
313809915929,19cyclictest0-21swapper22:25:540
313809915927,36cyclictest0-21swapper20:40:090
313809915917,24cyclictest29457-21irqstats22:15:420
313809915811,121cyclictest24411-21wc21:45:040
313809915717,24cyclictest10898-21munin-run23:40:020
313809915716,24cyclictest23563-21apt21:40:010
313809915713,44cyclictest15718-21munin-plugin-st00:10:000
313809915713,120cyclictest1900-21apt-get22:45:260
313809915616,117cyclictest900-21apt-get22:40:310
313809915615,117cyclictest7914-21diskstats23:20:290
313809915615,115cyclictest19648-21apt-get21:15:190
313809915611,120cyclictest19457-21find00:30:550
313809915513,118cyclictest5456-21cstates23:05:310
313809915439,23cyclictest17855-21timerwakeupswit21:01:010
313809915415,98cyclictest14536-21tr20:42:000
313809915415,115cyclictest16442-21apt-get20:55:200
313809915412,116cyclictest4463-21sort19:40:460
313809915410,120cyclictest14852-21/usr/sbin/munin20:46:000
313809915323,28cyclictest3486-21apt-get22:55:210
313809915316,24cyclictest752-21munin-run22:40:060
313809915314,96cyclictest26072-21apt-get21:55:200
313809915311,116cyclictest676-21grep19:16:170
31380991529,24cyclictest27602-21sort22:05:020
313809915220,30cyclictest30226-21diskstats22:20:320
313809915220,103cyclictest8994-21apt-get20:10:210
313809915217,24cyclictest6479-21munin-run19:55:010
313809915216,114cyclictest6276-21df23:10:280
313809915210,118cyclictest29114-21sed22:11:040
313809915117,113cyclictest16125-21grep00:10:500
313809915115,113cyclictest4162-21sort19:40:070
313809915113,38cyclictest111-21systemd-journal20:00:000
313809915112,98cyclictest18136-21sh00:25:010
313809915111,24cyclictest5512-21grep19:46:010
313809915035,24cyclictest15649-21apt-get20:50:190
313809915028,20cyclictest0-21swapper19:11:100
313809915020,28cyclictest20481-21apt-get21:20:210
313809915016,106cyclictest12868-21users20:31:070
313809915014,23cyclictest14106-21munin-run00:00:030
313809915011,116cyclictest22071-21apt-get21:30:200
313809914973,35cyclictest28466-21wc22:10:050
313809914921,26cyclictest9641-21memory23:30:460
313809914919,104cyclictest7516-21diskstats20:00:340
313809914917,21cyclictest14326-21df00:00:260
313809914915,107cyclictest1778-21apt-get19:25:200
313809914913,52cyclictest11809-21/usr/sbin/munin23:45:480
31380991488,116cyclictest7153-21uname23:15:410
313809914817,23cyclictest12780-21irqstats23:50:390
313809914815,111cyclictest19062-21wc21:10:430
313809914815,107cyclictest18056-21/usr/sbin/munin21:05:250
313809914813,113cyclictest17232-21grep00:16:020
313809914811,24cyclictest9889-21df20:15:270
313809914717,26cyclictest981-21/usr/sbin/munin19:21:010
313809914717,108cyclictest8892-21apt20:10:010
313809914714,107cyclictest10618-21/usr/sbin/munin20:20:370
313809914712,36cyclictest25898-21unixbench_singl21:51:030
313809914712,109cyclictest24487-21sshd21:45:190
31380991468,114cyclictest32400-21latency_hist22:35:010
313809914617,24cyclictest2933-21memory22:50:470
313809914615,23cyclictest8599-21apt-get23:25:140
313809914614,23cyclictest20534-21munin-run00:40:010
313809914614,22cyclictest12113-21munin-run20:30:010
313809914518,25cyclictest21380-21df_inode21:25:290
313809914510,23cyclictest2758-21kernelversion19:30:420
313809914418,24cyclictest11121-21df_inode23:40:280
313809914414,22cyclictest18478-21memory00:25:430
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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