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2025-07-02 - 12:51

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 Wed Jul 02, 2025 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16469032141127,9sleep20-21swapper/219:06:532
16469032141127,9sleep20-21swapper/219:06:532
16469522126112,9sleep60-21swapper/619:07:386
16469522126112,9sleep60-21swapper/619:07:386
16468152126112,9sleep10-21swapper/119:05:401
16468152126112,9sleep10-21swapper/119:05:391
16470772124110,9sleep00-21swapper/019:09:240
16470772124110,9sleep00-21swapper/019:09:230
1646949212294,23sleep30-21swapper/319:07:353
1646949212294,23sleep30-21swapper/319:07:343
16469442121107,9sleep70-21swapper/719:07:317
16469442121107,9sleep70-21swapper/719:07:317
16468562121107,9sleep40-21swapper/419:06:164
16468562121107,9sleep40-21swapper/419:06:154
16470732117103,9sleep50-21swapper/519:09:215
16470732117103,9sleep50-21swapper/519:09:215
1647365991030,100cyclictest0-21swapper/023:13:140
1647385991020,0cyclictest0-21swapper/519:10:155
16473659910299,3cyclictest573-21snmpd23:54:420
16473659910299,3cyclictest573-21snmpd21:15:310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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