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2026-07-05 - 10:39

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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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 Sun Jul 05, 2026 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2274699212295,9sleep10-21swapper/119:09:341
22744202119105,9sleep20-21swapper/219:05:342
22746332118104,9sleep00-21swapper/019:08:370
22746472116101,10sleep30-21swapper/319:08:473
22745932116102,9sleep50-21swapper/519:08:015
2274529211587,23sleep60-21swapper/619:07:066
2274583211399,9sleep40-21swapper/419:07:524
2274622211298,9sleep70-21swapper/719:08:277
22749709910394,1cyclictest0-21swapper/422:05:314
227495799103100,3cyclictest553-21snmpd21:02:021
22749769910298,3cyclictest553-21snmpd22:02:226
2274957991020,100cyclictest0-21swapper/121:37:091
2274957991020,100cyclictest0-21swapper/121:37:091
2274981991010,100cyclictest0-21swapper/700:11:497
22749769910199,2cyclictest553-21snmpd22:53:406
2274976991010,100cyclictest0-21swapper/623:30:146
22749739910199,2cyclictest553-21snmpd23:31:415
22749739910199,2cyclictest0-21swapper/519:54:185
2274970991010,101cyclictest0-21swapper/422:51:304
2274970991010,101cyclictest0-21swapper/421:49:344
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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