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2024-07-25 - 13:01

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 Thu Jul 25, 2024 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10082472128114,9sleep50-21swapper/519:08:405
10082872122108,9sleep00-21swapper/019:09:150
10080782121107,9sleep60-21swapper/619:06:176
10080552121107,9sleep10-21swapper/119:05:561
10081332119104,10sleep40-21swapper/419:07:034
10080522119104,10sleep70-21swapper/719:05:537
10081312114100,9sleep20-21swapper/219:07:012
1008114211298,9sleep30-21swapper/319:06:463
10085739910299,3cyclictest573-21snmpd00:24:243
1008589991010,100cyclictest0-21swapper/721:05:307
1008589991010,100cyclictest0-21swapper/721:05:307
1008589991010,100cyclictest0-21swapper/721:02:397
1008589991010,100cyclictest0-21swapper/720:33:447
10085869910199,2cyclictest573-21snmpd22:49:466
10085869910198,3cyclictest573-21snmpd21:09:006
10085869910198,3cyclictest573-21snmpd21:09:006
1008586991010,101cyclictest0-21swapper/623:45:146
1008586991010,100cyclictest0-21swapper/620:32:596
1008586991010,100cyclictest0-21swapper/600:00:166
10085829910199,1cyclictest573-21snmpd23:01:375
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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