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2026-06-25 - 23:17

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack5slot4s.osadl.org (updated Thu Jun 25, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
194993122130,4sleep375-21kworker/3:1-events07:15:023
22657132620,5chrt0-21swapper/312:30:223
1944495995937,9cyclictest1704890-21systemd-journal11:10:002
1944486995652,3cyclictest2105771-21kworker/u8:1+events_unbound10:20:010
1944495995140,8cyclictest1704890-21systemd-journal07:55:012
1944491995143,5cyclictest1704890-21systemd-journal12:15:171
1944491995041,7cyclictest2055971-21latency_hist09:00:011
1944491995041,7cyclictest2055971-21latency_hist09:00:011
1944486994839,7cyclictest2059986-21ntpq09:00:280
1944486994535,8cyclictest2170869-21diskstats10:55:180
1944491994437,5cyclictest2100607-21apt-get09:45:011
1944491994434,8cyclictest2150794-21/usr/sbin/munin10:35:291
1944491994339,3cyclictest2144721-21kworker/u8:2+events_unbound11:15:301
1944486994334,6cyclictest2220677-21diskstats11:45:180
1944486994233,7cyclictest2026446-21/usr/sbin/munin08:30:330
1944486994233,7cyclictest1704890-21systemd-journal11:20:180
1944491994131,7cyclictest2239308-21ntpq12:00:311
1944486994032,5cyclictest1704890-21systemd-journal12:05:000
1944495993931,6cyclictest1961040-21grep07:20:352
1944491993935,3cyclictest2066101-21kworker/u8:4+events_unbound09:10:331
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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