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2026-09-22 - 12:06

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #1

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 rackeslot1s.osadl.org (updated Tue Sep 22, 2026 00:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
240022215152,84sleep30-21swapper/319:06:403
240248215052,84sleep20-21swapper/219:09:372
240237211153,23sleep10-21swapper/119:09:281
239976210352,41sleep00-21swapper/019:06:040
5085622570,6sleep0151ktimers/022:49:450
240665992624,1cyclictest0-21swapper/222:50:102
240665992624,1cyclictest0-21swapper/222:15:062
240665992523,1cyclictest0-21swapper/223:05:042
240665992422,1cyclictest0-21swapper/223:35:062
240665992422,1cyclictest0-21swapper/200:35:072
5384322230,1sleep20-21swapper/223:10:112
240665992321,1cyclictest0-21swapper/223:45:062
240665992321,1cyclictest0-21swapper/221:35:002
240665992321,1cyclictest0-21swapper/221:35:002
240665992321,1cyclictest0-21swapper/221:20:062
240665992220,1cyclictest0-21swapper/221:55:032
240665992220,1cyclictest0-21swapper/219:20:072
240665992119,1cyclictest0-21swapper/222:50:012
240665992119,1cyclictest0-21swapper/221:45:022
240663992118,2cyclictest862650-21systemd-journal19:54:550
240665992018,1cyclictest0-21swapper/220:15:072
240665992018,1cyclictest0-21swapper/219:40:022
240663992010,9cyclictest846-21gdbus20:00:010
240665991917,1cyclictest0-21swapper/223:50:132
240665991917,1cyclictest0-21swapper/222:55:092
240665991917,1cyclictest0-21swapper/221:50:062
240664991916,2cyclictest521146-21/usr/sbin/munin23:00:001
240663991916,2cyclictest429594-21/usr/sbin/munin21:45:010
240666991816,1cyclictest0-21swapper/323:35:013
240666991816,1cyclictest0-21swapper/321:35:003
240666991816,1cyclictest0-21swapper/321:35:003
240666991816,1cyclictest0-21swapper/319:35:003
24066699180,16cyclictest569867-21turbostat23:40:003
240665991816,1cyclictest0-21swapper/223:20:102
240664991815,2cyclictest616-21dbus-daemon21:00:011
240664991815,2cyclictest527085-21sh23:05:001
240664991815,2cyclictest381222-21cstates21:05:011
240663991815,2cyclictest514849-21cut22:55:000
240663991815,2cyclictest393499-21df21:15:020
240663991815,2cyclictest1-21systemd19:40:000
240663991814,3cyclictest862650-21systemd-journal19:49:550
240663991814,3cyclictest639144-21systemd00:35:000
240666991715,1cyclictest0-21swapper/321:25:003
24066699171,14cyclictest301489-21turbostat20:04:553
24066699170,14cyclictest246706-21sleep19:15:003
240665991716,1cyclictest0-21swapper/221:40:012
240665991715,1cyclictest0-21swapper/223:05:002
240665991715,1cyclictest0-21swapper/222:00:072
240665991715,1cyclictest0-21swapper/219:58:142
240665991715,1cyclictest0-21swapper/219:15:062
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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