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2025-06-01 - 16:06

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 Sun Jun 01, 2025 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2524592128114,9sleep70-21swapper/707:06:097
252501212495,10sleep20-21swapper/207:06:452
2525672122107,10sleep30-21swapper/307:07:423
2524992122108,9sleep00-21swapper/007:06:430
2525002121107,9sleep10-21swapper/107:06:441
2506182120106,9sleep40-21swapper/407:05:114
2524842116102,9sleep50-21swapper/507:06:315
2525792115101,9sleep60-21swapper/607:07:526
252983991040,101cyclictest309263-21taskset08:59:505
252964991040,100cyclictest0-21swapper/011:55:180
2529649910399,4cyclictest573-21snmpd11:24:490
252964991030,100cyclictest0-21swapper/012:25:070
2529839910299,3cyclictest573-21snmpd08:01:065
252983991020,100cyclictest0-21swapper/510:38:305
2529649910299,3cyclictest573-21snmpd10:18:550
252992991010,100cyclictest0-21swapper/712:38:127
252992991010,100cyclictest0-21swapper/712:34:137
252992991010,100cyclictest0-21swapper/711:26:357
252988991010,100cyclictest0-21swapper/612:10:446
252988991010,100cyclictest0-21swapper/611:43:566
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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