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2025-10-25 - 05:37

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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 rack5slot3s.osadl.org (updated Sat Oct 25, 2025 00:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
525122490,6sleep341-21ksoftirqd/319:05:133
67032236163,24sleep10-21swapper/119:06:291
68242203166,24sleep20-21swapper/219:08:032
50152203165,25sleep00-21swapper/019:05:070
2998221770,3sleep2707799cyclictest23:40:162
3217821030,3sleep3708199cyclictest23:45:153
7077996558,2cyclictest0-21swapper/220:08:002
11012610,2sleep10-21swapper/122:35:151
232492560,3sleep011-21rcuc/019:45:020
219642530,3sleep00-21swapper/023:20:270
65092500,2sleep30-21swapper/320:20:143
708199333,9cyclictest12050irq/123-ahci[0019:56:283
706299324,13cyclictest20005-21runrttasks22:05:010
706999304,17cyclictest780-21rngd22:45:231
706999298,18cyclictest16232-21awk23:10:001
706999296,9cyclictest345-21vmstat22:30:281
7062992911,15cyclictest2399-21awk21:25:010
7062992910,16cyclictest16222-21munin-run23:10:010
707799281,7cyclictest6791-21turbostat21:35:012
706999287,12cyclictest1464-21ntp_states21:20:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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