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2023-09-23 - 23:30

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #5

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 
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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 rack0slot5s.osadl.org (updated Sat Sep 23, 2023 12:51:39)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25626242422417,3sleep50-21swapper/507:05:5611
25627182406400,3sleep120-21swapper/1207:07:234
25627142406401,3sleep80-21swapper/807:07:1814
25626822404398,4sleep100-21swapper/1007:06:492
25628532402396,4sleep60-21swapper/607:09:2512
25628132402397,3sleep10-21swapper/107:08:491
25627802401396,3sleep40-21swapper/407:08:1910
25627442401396,3sleep20-21swapper/207:07:468
25628392400394,4sleep90-21swapper/907:09:1315
25628412399393,4sleep110-21swapper/1107:09:143
25628272399393,4sleep140-21swapper/1407:09:026
25627932399393,3sleep150-21swapper/1507:08:317
25628202396391,3sleep70-21swapper/707:08:5513
25599252396391,3sleep30-21swapper/307:05:069
25627382395389,3sleep130-21swapper/1307:07:405
25628302394388,4sleep00-21swapper/007:09:040
26178062420,0sleep40-21swapper/408:20:2310
26178062420,0sleep40-21swapper/408:20:2310
27423262400,0sleep150-21swapper/1511:10:197
26806662400,0sleep140-21swapper/1409:45:266
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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