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2025-09-19 - 04:48

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 20 highest latencies:
System r0s0s.osadl.org (updated Fri Sep 19, 2025 00:46:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
35228232307276,23sleep00-21swapper/019:07:240
35228782302282,16sleep20-21swapper/219:08:062
35228062296261,27sleep40-21swapper/419:07:124
35228772294261,25sleep10-21swapper/119:08:051
35228412294281,8sleep30-21swapper/319:07:343
35228172292273,12sleep50-21swapper/519:07:215
35227532290282,5sleep60-21swapper/619:06:336
35228742286265,13sleep70-21swapper/719:08:037
3523520993530,5cyclictest833-21snmpd21:23:113
352352299340,33cyclictest0-21swapper/500:24:415
3523520993430,3cyclictest833-21snmpd00:18:223
3523524993330,2cyclictest833-21snmpd22:31:227
352352499330,1cyclictest0-21swapper/721:23:117
3523523993330,3cyclictest833-21snmpd20:27:306
3523522993328,4cyclictest833-21snmpd21:12:405
352352299330,1cyclictest0-21swapper/520:55:465
3523521993330,3cyclictest833-21snmpd19:24:134
3523520993330,2cyclictest3580552-21cat21:10:153
3523519993330,3cyclictest833-21snmpd19:25:482
3523519993329,3cyclictest833-21snmpd21:25:502
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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