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2026-09-18 - 04:39

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #8

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 rackbslot8s (updated Fri Sep 18, 2026 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13730902128110,12sleep00-21swapper/019:05:070
1375186212598,22sleep50-21swapper/519:09:465
13749812120106,9sleep60-21swapper/619:06:496
13750292118104,9sleep70-21swapper/719:07:317
1375015211789,8sleep20-21swapper/219:07:192
13749492117102,10sleep30-21swapper/319:06:233
1374941211399,9sleep40-21swapper/419:06:164
1375097211095,10sleep10-21swapper/119:08:291
13754619910299,2cyclictest553-21snmpd22:52:476
13754619910299,2cyclictest553-21snmpd22:52:476
13754619910298,3cyclictest553-21snmpd21:44:006
13754549910298,4cyclictest553-21snmpd00:16:324
1375454991020,100cyclictest0-21swapper/421:48:174
1375454991020,100cyclictest0-21swapper/421:12:084
1375454991020,100cyclictest0-21swapper/420:05:154
13754519910299,3cyclictest553-21snmpd22:48:053
13754519910299,3cyclictest553-21snmpd20:47:403
13754519910299,2cyclictest553-21snmpd21:56:423
1375442991020,100cyclictest0-21swapper/120:30:131
1375465991010,100cyclictest0-21swapper/722:25:377
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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