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2026-05-16 - 10:55

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 50 highest latencies:
System rackbslot8s (updated Sat May 16, 2026 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2744952118104,9sleep20-21swapper/219:09:092
2742322118104,9sleep00-21swapper/019:05:230
2743192117102,10sleep40-21swapper/419:06:404
2744622116102,9sleep70-21swapper/719:08:437
2744112116101,10sleep10-21swapper/119:07:571
2745162115101,9sleep50-21swapper/519:09:295
2744872115100,10sleep30-21swapper/319:09:033
274378211094,10sleep60-21swapper/619:07:306
274806991020,100cyclictest0-21swapper/623:16:126
2747829910299,3cyclictest553-21snmpd00:26:170
274810991010,100cyclictest0-21swapper/723:02:447
2748069910199,2cyclictest553-21snmpd21:12:026
2748069910199,2cyclictest553-21snmpd20:15:276
2748069910199,1cyclictest306748-21cat20:10:136
2748069910198,3cyclictest553-21snmpd23:44:016
274806991010,98cyclictest473947-21ssh23:14:546
274806991010,101cyclictest0-21swapper/622:12:076
274806991010,100cyclictest0-21swapper/600:03:236
2748049910199,2cyclictest553-21snmpd20:14:515
2748049910198,3cyclictest553-21snmpd22:04:465
2748049910198,3cyclictest365506-21cat21:35:145
274804991010,99cyclictest0-21swapper/522:37:475
274804991010,101cyclictest0-21swapper/521:05:135
274804991010,100cyclictest0-21swapper/523:20:125
274804991010,0cyclictest0-21swapper/520:26:535
2747999910199,1cyclictest553-21snmpd22:20:134
274799991010,100cyclictest0-21swapper/423:46:104
2747909910199,2cyclictest553-21snmpd21:16:292
2747909910199,2cyclictest553-21snmpd20:44:432
2747909910198,2cyclictest553-21snmpd00:39:122
274790991011,99cyclictest0-21swapper/219:49:472
274790991010,101cyclictest0-21swapper/221:38:212
274790991010,101cyclictest0-21swapper/220:11:242
274790991010,100cyclictest0-21swapper/221:03:382
274790991010,100cyclictest0-21swapper/219:30:142
274790991010,100cyclictest0-21swapper/200:13:292
27478299101100,1cyclictest409337-21cat22:15:150
274782991010,101cyclictest0-21swapper/023:28:460
274782991010,100cyclictest0-21swapper/022:00:570
274782991010,100cyclictest0-21swapper/019:36:440
274782991010,0cyclictest0-21swapper/020:43:330
274782991010,0cyclictest0-21swapper/019:57:000
274810991000,99cyclictest0-21swapper/700:29:397
274810991000,100cyclictest0-21swapper/723:22:117
274810991000,100cyclictest0-21swapper/722:35:477
274810991000,100cyclictest0-21swapper/722:02:467
274810991000,100cyclictest0-21swapper/720:59:167
274810991000,100cyclictest0-21swapper/720:53:467
274810991000,100cyclictest0-21swapper/700:20:097
2748069910099,1cyclictest553-21snmpd22:50:596
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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