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2026-06-18 - 12:47

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #3

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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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackeslot3s.osadl.org (updated Thu Jun 18, 2026 00:45:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3227772997525,11cyclictest275-21dbus-daemon22:40:013
3227758997229,14cyclictest3296603-21ssh23:29:150
3227772996926,9cyclictest1-21systemd22:35:003
3227772996925,14cyclictest3292378-21cron23:20:003
3227772996630,32cyclictest3230316-21sendmail-msp19:59:593
3227758996518,7cyclictest16850irq/134-800000000:20:590
3227772996426,9cyclictest37-21ksoftirqd/320:35:023
3227772996426,9cyclictest37-21ksoftirqd/320:35:013
3227772996325,11cyclictest37-21ksoftirqd/323:21:423
3227772996324,9cyclictest37-21ksoftirqd/322:15:013
3227758996227,3cyclictest131rcu_preempt00:28:440
322775899621,3cyclictest131rcu_preempt23:45:020
3227772996125,9cyclictest37-21ksoftirqd/323:34:203
3227772996021,11cyclictest37-21ksoftirqd/300:10:483
3227768996038,17cyclictest3467602-21systemd-journal19:59:592
3227768996024,25cyclictest275-21dbus-daemon20:20:002
322775899601,43cyclictest3259741-21ssh22:07:110
3227772995823,10cyclictest37-21ksoftirqd/322:47:393
322776899587,36cyclictest3319428-21modprobe00:20:012
322775899581,38cyclictest131rcu_preempt22:03:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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