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2026-05-05 - 04:08

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 Tue May 05, 2026 00:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
11042822122108,9sleep10-21swapper/119:07:081
11041652117102,10sleep50-21swapper/519:05:295
11043872115100,10sleep30-21swapper/319:08:393
1104263211499,10sleep20-21swapper/219:06:532
1104191211194,11sleep40-21swapper/419:05:524
1104467211096,9sleep00-21swapper/019:09:480
1104456210995,9sleep70-21swapper/719:09:407
1104372210893,10sleep60-21swapper/619:08:276
1104714991040,103cyclictest0-21swapper/222:45:142
110471999102100,2cyclictest553-21snmpd22:09:493
1104734991010,99cyclictest0-21swapper/719:48:237
1104734991010,101cyclictest0-21swapper/723:37:077
1104734991010,100cyclictest0-21swapper/723:19:067
1104734991010,0cyclictest0-21swapper/721:22:237
1104734991010,0cyclictest0-21swapper/720:49:317
11047309910199,2cyclictest553-21snmpd00:35:426
110473099101100,1cyclictest654620-21kworker/6:220:27:156
1104728991010,99cyclictest0-21swapper/519:26:205
11047239910199,2cyclictest553-21snmpd23:57:324
11047199910199,2cyclictest553-21snmpd23:51:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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