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2025-09-18 - 05:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #0

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.

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 r0s0s.osadl.org (updated Thu Sep 18, 2025 00:46:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27855432309282,19sleep30-21swapper/319:05:313
27842322302281,13sleep20-21swapper/219:05:062
27860232297283,9sleep10-21swapper/119:07:451
27861292292258,26sleep70-21swapper/719:09:127
27860042287267,13sleep40-21swapper/419:07:324
27861312286266,13sleep00-21swapper/019:09:140
27860382285266,12sleep60-21swapper/619:07:596
27859362283264,12sleep50-21swapper/519:06:385
28901842380,0sleep00-21swapper/022:50:220
2786662993528,6cyclictest833-21snmpd19:47:410
2786667993429,4cyclictest833-21snmpd22:12:305
2786662993430,4cyclictest833-21snmpd19:18:450
2786669993330,2cyclictest833-21snmpd21:57:057
2786669993330,2cyclictest833-21snmpd21:24:137
2786669993330,2cyclictest833-21snmpd19:50:147
2786667993330,2cyclictest833-21snmpd21:36:235
2786667993327,5cyclictest833-21snmpd23:07:345
278666799330,32cyclictest0-21swapper/523:39:375
278666799330,31cyclictest0-21swapper/519:59:405
278666799330,30cyclictest0-21swapper/500:39:335
2786666993330,2cyclictest833-21snmpd23:43:574
2786666993330,2cyclictest833-21snmpd22:44:044
2786666993330,2cyclictest833-21snmpd21:13:074
2786666993330,2cyclictest2825808-21cat20:30:134
278666699330,30cyclictest0-21swapper/422:00:194
2786665993330,2cyclictest833-21snmpd19:10:363
2786665993330,2cyclictest2860818-21cat21:45:133
2786664993330,2cyclictest833-21snmpd19:23:332
2786664993330,2cyclictest833-21snmpd00:17:552
2786664993329,3cyclictest833-21snmpd23:57:452
2786664993329,3cyclictest833-21snmpd23:10:252
2786664993329,3cyclictest833-21snmpd21:00:072
2786663993330,2cyclictest2849944-21latency_hist21:25:011
2786662993330,2cyclictest2860810-21cat21:45:130
2786662993330,2cyclictest2806904-21cat19:50:160
278666299330,33cyclictest0-21swapper/019:35:430
2786669993230,1cyclictest833-21snmpd20:00:027
2786669993229,2cyclictest833-21snmpd23:00:587
2786669993229,2cyclictest2880470-21cat22:30:167
278666999320,30cyclictest0-21swapper/722:37:067
278666999320,30cyclictest0-21swapper/721:02:017
2786668993230,2cyclictest833-21snmpd22:30:266
2786668993230,2cyclictest833-21snmpd20:20:386
2786668993230,2cyclictest833-21snmpd20:20:386
278666899320,31cyclictest0-21swapper/621:50:256
2786667993230,1cyclictest833-21snmpd23:43:545
278666799320,31cyclictest0-21swapper/500:27:255
278666799320,30cyclictest0-21swapper/522:07:355
2786666993229,2cyclictest833-21snmpd20:41:264
2786666993229,2cyclictest833-21snmpd00:07:024
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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