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2025-11-27 - 06:42

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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.
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 rack1slot6s.osadl.org (updated Thu Nov 27, 2025 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8230999021,9cyclictest1243-21snmpd21:34:540
823099883,77cyclictest0-21swapper/021:25:500
823099864,75cyclictest0-21swapper/021:09:490
823099863,11cyclictest0-21swapper/023:44:460
8230998618,12cyclictest0-21swapper/021:30:030
823099844,72cyclictest0-21swapper/023:07:440
823099843,29cyclictest0-21swapper/000:02:570
8230998321,9cyclictest9692-21telnet20:04:430
823099824,72cyclictest0-21swapper/020:59:490
8230998224,9cyclictest8818-21timerwakeupswit20:00:070
8230998223,52cyclictest0-21swapper/020:50:000
8230998215,59cyclictest8210-21idleruntime-cro18:54:350
823099814,69cyclictest0-21swapper/023:49:510
823099814,12cyclictest0-21swapper/021:54:560
823099813,26cyclictest0-21swapper/023:16:440
8230998119,8cyclictest29926-21munin-node19:39:550
823099803,26cyclictest0-21swapper/018:54:580
823099803,12cyclictest0-21swapper/021:04:500
823099803,12cyclictest0-21swapper/020:44:420
8230998026,47cyclictest1369-21runrttasks21:14:490
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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