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2026-04-04 - 13:58

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 50 highest latencies:
System rackbslot8s (updated Sat Apr 04, 2026 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
20397612120106,9sleep70-21swapper/719:06:187
20398492119103,10sleep20-21swapper/219:07:332
2040016211499,10sleep10-21swapper/119:09:571
2039797211499,10sleep60-21swapper/619:06:496
2040001211399,9sleep50-21swapper/519:09:455
2039878211197,9sleep40-21swapper/419:07:594
2039800210692,9sleep00-21swapper/019:06:510
2039951210591,9sleep30-21swapper/319:09:033
2040248991040,100cyclictest0-21swapper/200:15:382
20402639910399,4cyclictest553-21snmpd00:21:146
2040248991030,102cyclictest0-21swapper/221:43:432
204026399102100,2cyclictest553-21snmpd20:26:316
2040259991020,99cyclictest0-21swapper/520:14:045
2040259991020,101cyclictest0-21swapper/522:07:585
20402489910299,3cyclictest553-21snmpd22:10:552
20402489910299,3cyclictest553-21snmpd22:10:552
20402489910299,3cyclictest553-21snmpd21:26:212
20402439910299,2cyclictest553-21snmpd22:52:091
2040243991020,99cyclictest0-21swapper/121:15:541
2040243991020,100cyclictest0-21swapper/121:22:331
2040243991020,0cyclictest0-21swapper/123:19:301
20402639910199,2cyclictest553-21snmpd22:49:066
20402639910199,2cyclictest553-21snmpd00:35:236
2040263991010,100cyclictest0-21swapper/623:40:346
2040263991010,100cyclictest0-21swapper/620:36:146
2040263991010,0cyclictest0-21swapper/621:21:126
2040259991010,101cyclictest0-21swapper/522:52:185
2040259991010,101cyclictest0-21swapper/520:55:145
2040259991010,101cyclictest0-21swapper/520:02:545
2040257991010,100cyclictest0-21swapper/400:30:144
2040257991010,100cyclictest0-21swapper/400:05:154
2040248991010,101cyclictest0-21swapper/222:18:462
2040248991010,100cyclictest0-21swapper/221:08:462
2040248991010,100cyclictest0-21swapper/200:22:532
2040248991010,0cyclictest0-21swapper/220:40:562
20402439910199,2cyclictest553-21snmpd23:14:091
20402439910197,4cyclictest553-21snmpd23:24:241
204024399101100,1cyclictest553-21snmpd23:06:571
2040243991010,101cyclictest0-21swapper/121:58:191
2040243991010,101cyclictest0-21swapper/120:44:591
2040243991010,100cyclictest0-21swapper/123:34:031
2040243991010,100cyclictest0-21swapper/100:29:261
2040243991010,100cyclictest0-21swapper/100:11:381
2040243991010,0cyclictest0-21swapper/120:52:321
204024099101100,1cyclictest553-21snmpd20:26:190
20402679910099,1cyclictest0-21swapper/723:54:197
2040267991000,99cyclictest0-21swapper/721:57:377
2040267991000,99cyclictest0-21swapper/719:35:187
2040267991000,99cyclictest0-21swapper/719:14:597
2040267991000,100cyclictest0-21swapper/719:40:187
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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