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2026-04-07 - 15:40

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 Tue Apr 07, 2026 12:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3561232122110,8sleep50-21swapper/507:05:125
3578692118103,10sleep00-21swapper/007:06:510
3578822117103,9sleep40-21swapper/407:07:034
357881211484,10sleep30-21swapper/307:07:023
355973211398,10sleep70-21swapper/707:05:067
357767211298,9sleep20-21swapper/207:05:252
358087211095,10sleep10-21swapper/107:09:571
3583419910599,3cyclictest553-21snmpd10:43:385
357857210490,9sleep60-21swapper/607:06:416
358325991030,102cyclictest0-21swapper/110:56:121
3583419910299,3cyclictest395656-21cat08:20:165
358341991020,0cyclictest0-21swapper/507:46:235
3583259910299,3cyclictest553-21snmpd12:07:201
3583259910298,4cyclictest553-21snmpd12:17:151
358325991020,100cyclictest0-21swapper/110:08:531
358349991010,100cyclictest0-21swapper/712:23:577
35834699101100,1cyclictest553-21snmpd09:17:486
3583419910199,2cyclictest553-21snmpd09:36:075
35834199101100,1cyclictest553-21snmpd11:47:205
358341991010,101cyclictest0-21swapper/511:19:435
3583379910199,2cyclictest553-21snmpd11:35:034
35833799101100,1cyclictest553-21snmpd11:52:294
358337991010,101cyclictest0-21swapper/410:24:564
3583339910199,2cyclictest553-21snmpd11:05:003
3583339910199,2cyclictest553-21snmpd07:14:593
3583299910199,2cyclictest553-21snmpd10:45:332
3583299910199,2cyclictest553-21snmpd10:19:022
358329991010,100cyclictest0-21swapper/208:35:352
358329991010,100cyclictest0-21swapper/207:42:142
358329991010,100cyclictest0-21swapper/207:39:452
3583259910198,3cyclictest408868-21cat08:45:151
35832599101100,1cyclictest553-21snmpd07:36:071
358325991010,101cyclictest0-21swapper/110:02:081
358325991010,100cyclictest0-21swapper/111:44:291
358322991010,100cyclictest0-21swapper/009:28:180
358322991010,100cyclictest0-21swapper/007:42:090
358349991000,99cyclictest0-21swapper/712:03:387
358349991000,99cyclictest0-21swapper/711:17:067
358349991000,99cyclictest0-21swapper/711:07:377
358349991000,99cyclictest0-21swapper/709:48:317
358349991000,99cyclictest0-21swapper/709:48:317
358349991000,99cyclictest0-21swapper/709:39:547
358349991000,100cyclictest0-21swapper/712:12:387
358349991000,100cyclictest0-21swapper/709:16:337
358349991000,100cyclictest0-21swapper/708:54:387
3583469910099,1cyclictest553-21snmpd11:21:196
3583469910099,1cyclictest553-21snmpd10:41:216
3583469910099,1cyclictest553-21snmpd10:23:586
3583469910099,1cyclictest553-21snmpd08:59:116
3583469910099,1cyclictest553-21snmpd08:36:566
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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