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2025-12-01 - 09:23

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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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot6s.osadl.org (updated Mon Dec 01, 2025 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2437991090,6rtkit-daemon0-21swapper/322:30:563
211672970,7sleep121168-21ls21:31:051
815999915,78cyclictest0-21swapper/021:05:440
815999907,76cyclictest25963-21awk22:50:400
815999907,76cyclictest25963-21awk22:50:400
815999883,78cyclictest0-21swapper/023:50:580
8164998636,10cyclictest13669-21grep20:06:221
815999857,70cyclictest0-21swapper/019:02:490
815999856,71cyclictest0-21swapper/019:16:020
815999856,71cyclictest0-21swapper/019:16:020
815999826,68cyclictest0-21swapper/020:31:070
815999824,60cyclictest0-21swapper/020:51:180
815999806,51cyclictest0-21swapper/019:41:220
8159998034,39cyclictest17682-21crond19:10:490
815999802,72cyclictest0-21swapper/023:10:350
8159998018,45cyclictest261881munin-node22:51:100
8159998018,43cyclictest17848-21munin-node21:26:020
8159998018,43cyclictest17848-21munin-node21:26:020
815999795,67cyclictest0-21swapper/020:08:000
815999794,55cyclictest0-21swapper/019:36:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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