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2025-05-18 - 22:10

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #5

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 rack0slot5s.osadl.org (updated Sun May 18, 2025 00:50:40)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
33612862349313,11sleep90-21swapper/919:09:3715
33610802345326,11sleep140-21swapper/1419:06:296
33610942343325,11sleep110-21swapper/1119:06:423
33612802342324,11sleep30-21swapper/319:09:309
33611552341324,10sleep20-21swapper/219:07:378
33610932341324,10sleep100-21swapper/1019:06:412
33611832339320,12sleep130-21swapper/1319:08:045
33611062335317,11sleep60-21swapper/619:06:5312
33611012335318,11sleep10-21swapper/119:06:481
33610522335317,11sleep50-21swapper/519:06:0411
33610242335316,11sleep120-21swapper/1219:05:384
33612392334316,11sleep150-21swapper/1519:08:557
33612322334317,11sleep80-21swapper/819:08:4714
33611242334315,11sleep70-21swapper/719:07:1013
33612282332314,11sleep40-21swapper/419:08:4410
33582622328310,11sleep00-21swapper/019:05:110
35075792450,0sleep00-21swapper/022:20:190
35075792450,0sleep00-21swapper/022:20:190
34315722380,0sleep10-21swapper/120:40:141
3361665992827,1cyclictest1445-21snmpd00:01:093
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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