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2026-08-14 - 08:35

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack3slot6s.osadl.org (updated Fri Aug 14, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14069211895,18sleep10-21swapper/119:05:031
3272221140,3sleep01588899cyclictest21:10:510
15842211294,13sleep20-21swapper/219:09:452
151512112102,6sleep00-21swapper/019:05:550
15563210897,6sleep30-21swapper/319:06:103
17362760,0sleep20-21swapper/223:25:152
49782750,0sleep00-21swapper/021:15:190
125312580,5sleep31589199cyclictest21:24:363
15890992320,2cyclictest22586-21kworker/u8:021:48:022
15889992320,2cyclictest22586-21kworker/u8:021:48:061
324482220,1sleep332451-21ntp_kernel_pll_22:50:183
15890992219,2cyclictest9091-21kworker/u8:223:08:062
15890992219,2cyclictest29448-21kworker/u8:022:19:052
15890992219,2cyclictest22586-21kworker/u8:022:08:052
15891992118,2cyclictest5210-21kworker/u8:100:13:053
15891992118,2cyclictest23275-21kworker/u8:222:09:053
15890992118,2cyclictest22586-21kworker/u8:021:56:052
6862200,1sleep2693-21wc19:51:042
15891992017,2cyclictest26472-21kworker/u8:023:22:063
15891992017,2cyclictest23275-21kworker/u8:222:43:043
15890992017,2cyclictest4724-21kworker/u8:122:26:052
15890992017,2cyclictest29448-21kworker/u8:022:20:052
15890992017,2cyclictest21573-21kworker/u8:200:26:052
15890992017,2cyclictest16924-21kworker/u8:122:04:052
1589099201,2cyclictest0-21swapper/221:38:052
15889992017,2cyclictest9091-21kworker/u8:223:29:041
1588899200,15cyclictest0-21swapper/022:32:040
57152190,1sleep20-21swapper/200:36:032
15891991916,2cyclictest9091-21kworker/u8:200:07:053
15891991916,2cyclictest26671-21kworker/u8:122:58:053
15891991916,2cyclictest23275-21kworker/u8:222:31:053
15890991916,2cyclictest31483-21kworker/u8:023:58:062
15890991916,2cyclictest27285-21kworker/u8:121:23:052
15890991916,2cyclictest26671-21kworker/u8:122:49:052
15890991916,2cyclictest11847-21kworker/u8:322:35:052
15889991916,2cyclictest30908-21kworker/u8:221:27:041
15889991916,2cyclictest27285-21kworker/u8:121:32:041
1588899190,14cyclictest0-21swapper/021:34:050
15891991815,2cyclictest9838-21kworker/u8:123:40:053
15891991815,2cyclictest31483-21kworker/u8:000:01:043
15891991815,2cyclictest27285-21kworker/u8:121:39:053
15891991815,2cyclictest26671-21kworker/u8:122:48:053
15891991815,2cyclictest23275-21kworker/u8:222:29:053
15891991815,2cyclictest22586-21kworker/u8:021:55:053
15891991815,2cyclictest21573-21kworker/u8:200:28:013
15890991815,2cyclictest9091-21kworker/u8:223:30:052
15890991815,2cyclictest5210-21kworker/u8:100:09:052
15890991815,2cyclictest27285-21kworker/u8:121:33:052
15890991815,2cyclictest23275-21kworker/u8:222:41:042
15890991815,2cyclictest22586-21kworker/u8:021:50:052
15889991815,2cyclictest23275-21kworker/u8:222:44:051
15891991713,2cyclictest9091-21kworker/u8:223:53:043
1589199170,2cyclictest0-21swapper/321:48:063
15890991714,2cyclictest9091-21kworker/u8:223:19:052
15890991714,2cyclictest5210-21kworker/u8:100:12:062
1589099170,2cyclictest30929-21diskmemload00:22:052
15889991714,2cyclictest26671-21kworker/u8:123:00:051
15889991714,2cyclictest26671-21kworker/u8:123:00:051
15889991714,2cyclictest26472-21kworker/u8:023:21:051
15889991714,2cyclictest15926-21kworker/u8:023:43:041
1588999170,2cyclictest0-21swapper/122:09:041
1588899170,16cyclictest0-21swapper/000:10:050
1588899170,11cyclictest0-21swapper/023:46:050
1588899170,11cyclictest0-21swapper/000:21:050
15891991613,2cyclictest9838-21kworker/u8:123:38:053
15891991613,2cyclictest9091-21kworker/u8:223:10:053
15891991613,2cyclictest2173-21kworker/u8:100:39:053
15890991613,2cyclictest9091-21kworker/u8:223:45:052
15890991613,2cyclictest9091-21kworker/u8:223:03:052
15890991613,2cyclictest9091-21kworker/u8:223:03:042
15890991613,2cyclictest16924-21kworker/u8:122:14:062
15890991613,2cyclictest1668-21kworker/u8:022:55:042
15890991613,2cyclictest10858-21kworker/u8:000:17:042
15890991611,3cyclictest31216-21ssh21:10:052
15889991613,2cyclictest27285-21kworker/u8:121:37:041
15889991613,2cyclictest16872-21kworker/u8:022:36:061
1588999160,14cyclictest0-21swapper/100:28:021
1588899160,2cyclictest30929-21diskmemload00:05:040
15891991512,2cyclictest9091-21kworker/u8:223:09:053
15891991512,2cyclictest5210-21kworker/u8:100:24:053
15891991512,2cyclictest30908-21kworker/u8:221:28:053
15891991512,2cyclictest29215-21kworker/u8:221:42:013
15891991512,2cyclictest27285-21kworker/u8:121:34:023
15891991512,2cyclictest26472-21kworker/u8:023:33:053
15891991512,2cyclictest26472-21kworker/u8:023:28:043
15891991512,2cyclictest11180-21kworker/u8:222:01:053
15890991512,2cyclictest9678-21kworker/u8:020:19:052
15890991512,2cyclictest29970-21kworker/u8:219:58:042
15890991512,2cyclictest29595-21kworker/u8:000:31:052
15890991512,2cyclictest27285-21kworker/u8:121:03:042
15890991512,2cyclictest25180-21kworker/u8:019:45:052
15890991512,2cyclictest23251-21kworker/u8:019:10:042
15890991512,2cyclictest19591-21kworker/u8:019:17:052
15890991512,2cyclictest15333-21kworker/u8:020:40:042
15890991512,2cyclictest12296-21kworker/u8:120:29:042
1589099151,12cyclictest0-21swapper/220:20:112
1589099150,2cyclictest0-21swapper/223:42:052
1589099150,14cyclictest0-21swapper/223:12:052
1588999151,3cyclictest18439-21ssh00:15:301
1588999151,3cyclictest16879-21memory19:10:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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