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2026-07-16 - 05:56

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 Jul 16, 2026 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
148810921730,3sleep3584-21kworker/3:2+events22:02:453
14998952950,3sleep20-21swapper/222:17:332
1312881996150,8cyclictest281-21systemd-journal20:20:000
1312886995645,9cyclictest281-21systemd-journal23:50:011
1312890995341,9cyclictest1543055-21/usr/sbin/munin23:00:012
1312886995243,7cyclictest1488715-21/usr/sbin/munin22:07:421
1312881995145,4cyclictest1567546-21kworker/u8:1+flush-8:000:05:000
1312890995046,3cyclictest1271730-21kworker/u8:0+events_unbound21:07:402
1312886995040,8cyclictest281-21systemd-journal00:30:001
1312881995045,3cyclictest1448534-21kworker/u8:3+flush-8:023:02:290
1312881994941,6cyclictest1408967-21kworker/u8:2+flush-8:021:37:290
1312881994839,7cyclictest1572735-21apt-get23:30:000
1312886994736,8cyclictest1443520-21latency_hist21:20:011
1312881994741,4cyclictest1567546-21kworker/u8:1+flush-8:023:37:280
15020642460,4sleep0161rcu_preempt22:17:350
1312886994638,5cyclictest1612584-21latency_hist00:10:011
1312890994541,3cyclictest1408967-21kworker/u8:2+events_unbound21:27:472
1312886994539,4cyclictest1602678-40logrotate23:59:591
1312881994540,3cyclictest1398869-21kworker/u8:1+events_unbound21:00:000
1312881994539,4cyclictest1271730-21kworker/u8:0+flush-8:020:47:420
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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