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2026-11-10 - 23:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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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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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack9slot3s.osadl.org (updated Tue Nov 10, 2026 12:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1305918036,41phc2sys0-21swapper/107:09:121
1305918036,41phc2sys0-21swapper/107:09:111
128691730,66ptp4l0-21swapper/007:08:190
128691730,66ptp4l0-21swapper/007:08:180
2017525349,2sleep20-21swapper/207:07:542
2017525349,2sleep20-21swapper/207:07:542
1997125245,5sleep30-21swapper/307:05:113
1997125245,5sleep30-21swapper/307:05:103
128691300,0ptp4l0-21swapper/111:55:191
128691190,1ptp4l101ktimersoftd/008:10:020
128691190,0ptp4l0-21swapper/112:05:201
128691190,0ptp4l0-21swapper/011:00:140
128691190,0ptp4l0-21swapper/010:55:130
128691180,0ptp4l0-21swapper/111:40:131
128691180,0ptp4l0-21swapper/111:00:161
128691180,0ptp4l0-21swapper/011:20:130
128691180,0ptp4l0-21swapper/011:20:130
128691170,2ptp4l508-21snmp_o5powerctl10:55:201
128691160,3ptp4l17333-21wc11:30:010
128691160,1ptp4l6257-21snmp_o5powerctl10:05:241
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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