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2026-04-28 - 17:20

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 28, 2026 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
843832212191,10sleep20-21swapper/219:08:302
8439022117103,9sleep70-21swapper/719:09:317
84417199116116,0cyclictest0-21swapper/222:18:532
8438932116102,9sleep00-21swapper/019:09:240
8438702114100,9sleep40-21swapper/419:09:034
8436382114100,9sleep50-21swapper/519:05:445
843726211398,9sleep10-21swapper/119:07:011
841820211399,9sleep60-21swapper/619:05:046
843672210893,10sleep30-21swapper/319:06:153
8441829910499,2cyclictest553-21snmpd23:40:575
8441759910499,4cyclictest553-21snmpd22:33:213
844190991020,102cyclictest0-21swapper/722:54:197
844190991020,100cyclictest0-21swapper/722:11:117
8441829910299,1cyclictest553-21snmpd20:54:515
8441829910299,1cyclictest553-21snmpd00:12:405
8441829910298,1cyclictest553-21snmpd00:15:375
8441799910299,3cyclictest553-21snmpd00:03:374
844171991020,100cyclictest0-21swapper/200:08:312
844162991020,101cyclictest0-21swapper/000:35:130
844190991010,99cyclictest0-21swapper/722:44:487
844190991010,100cyclictest0-21swapper/723:56:517
844190991010,0cyclictest0-21swapper/722:34:597
8441869910199,2cyclictest553-21snmpd23:38:206
8441869910199,2cyclictest1011401-21kworker/6:122:48:316
84418699101100,1cyclictest944736-21kworker/6:222:36:426
84418699101100,1cyclictest944736-21kworker/6:222:30:506
84418699101100,1cyclictest944736-21kworker/6:222:25:536
84418699101100,1cyclictest944736-21kworker/6:222:22:536
84418699101100,1cyclictest944736-21kworker/6:222:19:456
84418699101100,1cyclictest944736-21kworker/6:222:03:596
84418699101100,1cyclictest944736-21kworker/6:221:58:516
84418699101100,1cyclictest944736-21kworker/6:221:52:316
84418699101100,1cyclictest897958-21kworker/6:121:38:036
84418699101100,1cyclictest897958-21kworker/6:121:30:096
84418699101100,1cyclictest897958-21kworker/6:121:27:116
84418699101100,1cyclictest897958-21kworker/6:121:15:176
84418699101100,1cyclictest897958-21kworker/6:121:12:206
84418699101100,1cyclictest897958-21kworker/6:120:55:156
84418699101100,1cyclictest870261-21kworker/6:220:00:186
84418699101100,1cyclictest820739-21kworker/6:019:50:176
84418699101100,1cyclictest820739-21kworker/6:019:40:176
84418699101100,1cyclictest820739-21kworker/6:019:25:156
84418699101100,1cyclictest820739-21kworker/6:019:10:126
84418699101100,1cyclictest1083603-21kworker/6:223:59:326
84418699101100,1cyclictest1083603-21kworker/6:200:35:336
84418699101100,1cyclictest1083603-21kworker/6:200:33:016
84418699101100,1cyclictest1083603-21kworker/6:200:11:396
84418699101100,1cyclictest1028064-21kworker/6:023:44:396
84418699101100,1cyclictest1028064-21kworker/6:023:30:086
84418699101100,1cyclictest1028064-21kworker/6:023:28:156
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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