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2025-11-17 - 20:55

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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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 Mon Nov 17, 2025 12:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17935182152134,7sleep30-21swapper/307:09:513
17934472135116,8sleep70-21swapper/707:08:507
17933012133118,10sleep00-21swapper/007:06:430
17932732131120,7sleep10-21swapper/107:06:201
1794008991290,128cyclictest0-21swapper/611:45:166
1793325212899,9sleep60-21swapper/607:07:056
17934452127113,9sleep50-21swapper/507:08:485
17932202127113,9sleep40-21swapper/407:05:344
17932832123106,11sleep20-21swapper/207:06:292
17939939910420,84cyclictest1935866-21kworker/3:010:52:573
17939939910319,84cyclictest1793747-21kworker/3:108:25:033
17939939910319,84cyclictest1793747-21kworker/3:107:55:543
17940089910299,3cyclictest546-21snmpd12:37:396
1794013991010,100cyclictest0-21swapper/707:15:057
17940089910199,2cyclictest546-21snmpd11:23:106
17940089910199,1cyclictest546-21snmpd07:20:016
17940089910198,3cyclictest1816001-21cat07:50:166
17940049910199,2cyclictest546-21snmpd08:22:575
17940049910199,1cyclictest597-21lldpd10:01:305
179400499101100,1cyclictest546-21snmpd12:39:375
1794004991010,100cyclictest0-21swapper/508:07:065
17939999910199,2cyclictest546-21snmpd12:15:494
1793999991010,100cyclictest0-21swapper/410:32:274
1793999991010,100cyclictest0-21swapper/407:14:144
17939939910199,2cyclictest546-21snmpd09:52:543
17939939910199,2cyclictest546-21snmpd09:29:563
17939939910199,1cyclictest546-21snmpd09:02:043
1793988991010,99cyclictest0-21swapper/207:52:472
1793988991010,100cyclictest0-21swapper/211:09:572
179398199101100,1cyclictest546-21snmpd11:21:011
1793981991010,100cyclictest0-21swapper/110:42:171
17939769910199,2cyclictest546-21snmpd12:17:120
1794013991000,99cyclictest0-21swapper/711:56:127
1794013991000,99cyclictest0-21swapper/711:17:127
1794013991000,99cyclictest0-21swapper/710:32:387
1794013991000,99cyclictest0-21swapper/709:46:407
1794013991000,100cyclictest0-21swapper/712:05:297
17940089910099,1cyclictest546-21snmpd11:51:386
17940089910099,1cyclictest546-21snmpd10:23:376
17940089910099,1cyclictest546-21snmpd09:16:476
17940089910099,1cyclictest546-21snmpd07:57:596
17940089910099,1cyclictest546-21snmpd07:46:146
17940089910098,2cyclictest546-21snmpd10:45:566
17940089910098,1cyclictest546-21snmpd07:19:176
17940089910097,3cyclictest546-21snmpd10:03:226
1794008991000,1cyclictest0-21swapper/611:25:166
1794008991000,100cyclictest0-21swapper/611:58:186
1794008991000,100cyclictest0-21swapper/610:43:306
17940049910099,1cyclictest546-21snmpd11:58:355
17940049910099,1cyclictest546-21snmpd11:16:125
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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