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2025-12-31 - 03:32

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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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 50 highest latencies:
System rack3slot6s.osadl.org (updated Wed Dec 31, 2025 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1663921510,0sleep00-21swapper/000:20:100
29655211895,18sleep00-21swapper/019:06:150
29775211693,17sleep30-21swapper/319:07:463
29642211594,16sleep20-21swapper/219:06:052
29875211396,12sleep10-21swapper/119:09:041
39992840,1sleep14003-21hwlatdetect21:35:161
109712780,0sleep20-21swapper/219:40:212
228202730,1sleep011-21rcuc/023:10:430
241992690,0sleep30-21swapper/323:50:233
130862690,0sleep10-21swapper/121:05:211
101182670,0sleep30-21swapper/321:41:403
29976993516,18cyclictest0-21swapper/121:55:131
2997899255,18cyclictest0-21swapper/321:55:133
154602250,1sleep013852-21diskmemload21:10:260
116032250,1sleep311602-21sensors_fan22:20:243
64222210,0sleep30-21swapper/321:38:113
49852200,2sleep229-21rcuc/222:50:252
39082190,1sleep02997599cyclictest21:35:150
29976991913,4cyclictest13852-21diskmemload22:45:131
2997699190,3cyclictest0-21swapper/121:43:041
2997899180,16cyclictest0-21swapper/319:55:143
2997799181,15cyclictest0-21swapper/221:40:132
2997699183,2cyclictest0-21swapper/119:57:041
2997699181,2cyclictest0-21swapper/119:11:041
2997699180,5cyclictest0-21swapper/119:37:051
2997699180,3cyclictest0-21swapper/121:26:051
29978991712,3cyclictest12301-21ssh21:45:143
29977991714,2cyclictest23278-21kworker/u8:023:54:052
2997699172,2cyclictest0-21swapper/122:41:051
2997699171,2cyclictest0-21swapper/119:54:051
2997699170,3cyclictest0-21swapper/123:47:041
2997799161,13cyclictest4272-21ntp_kernel_pll_21:35:182
2997799161,13cyclictest0-21swapper/200:32:362
2997699162,2cyclictest0-21swapper/123:00:051
2997699161,2cyclictest0-21swapper/120:08:051
2997899150,14cyclictest0-21swapper/323:37:233
2997899150,13cyclictest0-21swapper/321:25:433
2997799151,3cyclictest10086-21munin-run22:20:002
29977991512,2cyclictest0-21swapper/222:13:142
2997799150,3cyclictest14314-21ssh23:00:532
2997799150,13cyclictest13852-21diskmemload23:27:512
2997799150,13cyclictest0-21swapper/200:20:432
29976991512,2cyclictest0-21swapper/122:26:111
29976991510,3cyclictest0-21swapper/123:56:271
2997699150,3cyclictest0-21swapper/122:55:141
2997699150,2cyclictest0-21swapper/122:05:201
2997699150,13cyclictest0-21swapper/121:33:461
29975991512,2cyclictest2273-21kworker/u8:000:08:070
2997599151,12cyclictest32212-21apt-get20:35:120
2997599150,14cyclictest0-21swapper/021:50:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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