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2025-12-13 - 21:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Sat Dec 13, 2025 12:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1547600211955,59sleep30-21swapper/307:07:173
154289228469,9sleep20-21swapper/207:05:032
154772627963,10sleep10-21swapper/107:08:551
154289527756,14sleep00-21swapper/007:05:050
18098052660,3sleep2421rcuc/211:15:172
1547955992516,6cyclictest67150irq/132-enp1s0-TxRx-309:35:133
154795599227,9cyclictest1609592-21taskset08:05:153
154795599227,12cyclictest0-21swapper/309:55:183
154795599222,13cyclictest1586994-21taskset07:45:113
1547955992219,1cyclictest0-21swapper/308:25:003
154795599212,13cyclictest1781653-21taskset10:50:123
1547955992118,1cyclictest0-21swapper/309:35:003
154795599202,13cyclictest17381952sleep310:05:203
154795599192,11cyclictest1776462-21taskset10:45:113
1547955991916,1cyclictest0-21swapper/310:20:163
1547955991916,1cyclictest0-21swapper/307:25:143
1547955991916,1cyclictest0-21swapper/307:15:083
154795599191,15cyclictest0-21swapper/311:55:003
154795599191,15cyclictest0-21swapper/311:15:123
154795599191,13cyclictest1797373-21chrt11:05:123
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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