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2026-05-20 - 22:13

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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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 100 highest latencies:
System rackbslot8s (updated Wed May 20, 2026 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
260215211889,10sleep20-21swapper/207:08:212
2600302118103,9sleep50-21swapper/507:05:425
2600562117103,9sleep40-21swapper/407:06:064
2601652116101,10sleep10-21swapper/107:07:401
260200211499,10sleep70-21swapper/707:08:107
260255211298,9sleep60-21swapper/607:08:566
260016211298,9sleep00-21swapper/007:05:300
260327210894,9sleep30-21swapper/307:09:583
26057199107104,2cyclictest45-21ksoftirqd/409:22:514
2605559910399,4cyclictest553-21snmpd08:59:460
2605559910399,4cyclictest553-21snmpd07:43:050
260564991020,102cyclictest0-21swapper/209:45:142
260564991020,100cyclictest0-21swapper/212:26:092
2605559910299,3cyclictest553-21snmpd12:39:120
2605559910299,3cyclictest553-21snmpd09:07:560
260583991010,99cyclictest0-21swapper/708:57:567
260583991010,101cyclictest0-21swapper/712:37:287
260583991010,101cyclictest0-21swapper/711:43:417
260583991010,101cyclictest0-21swapper/707:52:577
260583991010,100cyclictest0-21swapper/708:05:417
260583991010,0cyclictest0-21swapper/710:16:477
2605799910199,2cyclictest553-21snmpd10:43:486
2605759910199,2cyclictest553-21snmpd10:26:205
2605759910199,1cyclictest553-21snmpd10:20:025
2605759910198,3cyclictest310515-21cat08:45:135
260575991010,99cyclictest0-21swapper/507:19:535
260575991010,101cyclictest0-21swapper/508:29:305
260575991010,100cyclictest0-21swapper/510:00:145
260575991010,100cyclictest0-21swapper/508:20:305
260575991010,100cyclictest0-21swapper/508:15:305
260575991010,0cyclictest0-21swapper/510:08:105
2605719910199,2cyclictest553-21snmpd09:52:134
2605719910199,1cyclictest553-21snmpd09:37:294
260571991010,100cyclictest0-21swapper/409:32:034
26056999101100,1cyclictest553-21snmpd08:15:023
2605649910199,2cyclictest553-21snmpd10:21:102
260564991010,101cyclictest0-21swapper/208:25:162
260564991010,101cyclictest0-21swapper/207:23:102
260564991010,100cyclictest0-21swapper/212:23:092
260564991010,100cyclictest0-21swapper/210:35:362
260564991010,0cyclictest0-21swapper/211:11:162
2605609910199,2cyclictest553-21snmpd11:40:131
2605609910199,2cyclictest553-21snmpd11:01:451
260560991010,99cyclictest0-21swapper/110:26:351
260560991010,100cyclictest0-21swapper/107:53:591
260560991010,100cyclictest0-21swapper/107:11:251
2605559910198,3cyclictest553-21snmpd09:21:330
260555991010,101cyclictest0-21swapper/011:31:590
260555991010,101cyclictest0-21swapper/011:02:540
260555991010,101cyclictest0-21swapper/008:07:570
260583991000,99cyclictest0-21swapper/711:49:507
260583991000,99cyclictest0-21swapper/711:13:347
260583991000,99cyclictest0-21swapper/710:02:287
260583991000,99cyclictest0-21swapper/708:21:467
260583991000,99cyclictest0-21swapper/707:41:227
260583991000,100cyclictest0-21swapper/712:27:387
260583991000,100cyclictest0-21swapper/708:47:377
260583991000,100cyclictest0-21swapper/708:41:237
260583991000,100cyclictest0-21swapper/708:41:237
2605799910099,1cyclictest553-21snmpd07:45:236
2605799910098,2cyclictest0-21swapper/609:45:146
260579991000,99cyclictest0-21swapper/608:51:166
260579991000,100cyclictest0-21swapper/608:40:196
260579991000,100cyclictest0-21swapper/608:40:196
260579991000,100cyclictest0-21swapper/608:32:106
2605759910099,1cyclictest553-21snmpd11:28:245
2605759910099,1cyclictest553-21snmpd10:55:445
2605759910099,1cyclictest553-21snmpd07:45:205
2605759910099,1cyclictest553-21snmpd07:11:195
2605759910099,0cyclictest553-21snmpd11:12:375
2605759910098,1cyclictest553-21snmpd09:24:215
2605759910097,3cyclictest553-21snmpd11:44:085
260575991000,99cyclictest0-21swapper/511:39:445
260575991000,99cyclictest0-21swapper/509:41:545
260575991000,99cyclictest0-21swapper/508:11:305
260575991000,100cyclictest0-21swapper/512:30:155
260575991000,100cyclictest0-21swapper/512:29:595
2605719910099,1cyclictest553-21snmpd11:41:534
2605719910099,1cyclictest553-21snmpd08:43:564
2605719910099,1cyclictest553-21snmpd08:43:554
260571991000,99cyclictest0-21swapper/411:45:384
260571991000,99cyclictest0-21swapper/410:46:184
260571991000,99cyclictest0-21swapper/410:08:074
260571991000,99cyclictest0-21swapper/408:26:584
260571991000,99cyclictest0-21swapper/408:08:364
260571991000,100cyclictest0-21swapper/408:02:234
260571991000,100cyclictest0-21swapper/407:45:144
2605699910099,1cyclictest553-21snmpd10:41:453
2605699910099,1cyclictest553-21snmpd10:10:353
2605699910099,1cyclictest553-21snmpd09:48:043
2605699910099,1cyclictest553-21snmpd08:35:313
2605699910099,1cyclictest553-21snmpd08:26:073
2605699910099,1cyclictest553-21snmpd08:01:183
2605699910099,1cyclictest553-21snmpd07:26:193
2605699910098,2cyclictest553-21snmpd12:27:003
2605649910097,3cyclictest553-21snmpd08:04:092
260564991000,99cyclictest0-21swapper/210:04:302
260564991000,99cyclictest0-21swapper/207:46:172
260564991000,100cyclictest0-21swapper/210:43:362
260564991000,100cyclictest0-21swapper/209:43:252
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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