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2026-07-16 - 08:24

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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.

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 rackeslot4s.osadl.org (updated Thu Jul 16, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
458871994541,3cyclictest702534-21kworker/u8:0+events_unbound23:34:460
458876994335,5cyclictest557579-21latency_hist20:45:002
458879994034,4cyclictest797305-21latency_hist00:35:013
458879994034,4cyclictest797305-21latency_hist00:35:013
458871994037,2cyclictest589163-21kworker/u8:2+events_unbound21:13:280
458871994036,3cyclictest761315-21/usr/sbin/munin00:00:140
458873993935,3cyclictest335557-21systemd-journal21:18:441
458876993831,5cyclictest594532-21latency_hist21:20:022
458871993733,3cyclictest702534-21kworker/u8:0+events_unbound23:17:470
458871993733,3cyclictest589163-21kworker/u8:2+events_unbound22:49:460
458871993733,3cyclictest484324-21kworker/u8:0+events_unbound20:11:440
458871993633,2cyclictest589163-21kworker/u8:2+events_unbound21:50:230
458871993633,2cyclictest484324-21kworker/u8:0+events_unbound20:25:560
458871993532,2cyclictest484324-21kworker/u8:0+events_unbound20:05:180
458871993531,3cyclictest702534-21kworker/u8:0+events_unbound23:06:320
458871993531,3cyclictest687684-21kworker/u8:3+events_unbound23:01:290
458879993428,4cyclictest630696-21latency_hist21:55:003
458871993431,2cyclictest75-21kswapd019:40:030
458871993431,2cyclictest687684-21kworker/u8:3+events_unbound23:10:150
458871993431,2cyclictest625159-21kworker/u8:3+events_unbound21:49:440
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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