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2024-04-25 - 02:38

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 - 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 rack0slot5s.osadl.org (updated Thu Apr 25, 2024 00:45:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30490072421402,17sleep80-21swapper/819:09:4414
30490102408402,4sleep110-21swapper/1119:09:473
30489342408402,4sleep50-21swapper/519:08:3711
30462712405399,4sleep150-21swapper/1519:05:047
30489752403397,4sleep100-21swapper/1019:09:142
30488102401395,4sleep70-21swapper/719:06:4713
30489672400394,4sleep40-21swapper/419:09:0810
30487502399392,4sleep20-21swapper/219:05:548
30489882398391,4sleep60-21swapper/619:09:2612
30488562398392,4sleep140-21swapper/1419:07:276
30489832397390,4sleep10-21swapper/119:09:211
30487682397391,4sleep30-21swapper/319:06:119
30489412396390,4sleep120-21swapper/1219:08:444
30488592395389,4sleep00-21swapper/019:07:280
30488722392386,4sleep130-21swapper/1319:07:415
30488852390384,4sleep90-21swapper/919:07:5315
3049334994520,25cyclictest3233597-21cstates23:45:1110
32583342380,0sleep90-21swapper/900:20:1315
3049320993210,1cyclictest0-21swapper/023:47:000
3049334993118,13cyclictest0-21swapper/421:44:2310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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