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2024-04-24 - 12:03

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 Wed Apr 24, 2024 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27558832131120,7sleep50-21swapper/519:07:205
27559592127112,10sleep70-21swapper/719:08:287
27559652123109,9sleep40-21swapper/419:08:334
27560552122108,9sleep20-21swapper/219:09:512
27539472122107,10sleep30-21swapper/319:05:033
27557792121106,10sleep60-21swapper/619:05:546
27558392117103,9sleep10-21swapper/119:06:451
27544552115102,8sleep00-21swapper/019:05:160
27563269910498,3cyclictest721930-21snmpd23:38:096
275630699102100,2cyclictest721930-21snmpd22:08:401
2756330991010,100cyclictest0-21swapper/720:59:417
27563269910199,2cyclictest721930-21snmpd22:20:106
27563269910199,2cyclictest721930-21snmpd19:43:266
27563269910198,3cyclictest721930-21snmpd22:46:566
27563269910198,3cyclictest721930-21snmpd21:49:366
2756326991010,100cyclictest0-21swapper/623:59:046
2756326991010,100cyclictest0-21swapper/619:50:186
2756326991010,0cyclictest0-21swapper/623:16:546
27563229910199,1cyclictest2763827-21cat19:25:105
2756322991010,101cyclictest0-21swapper/520:06:455
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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