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2026-05-03 - 01:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackcslot7s.osadl.org (updated Sat May 02, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
22195623380,18sleep10-21swapper/107:05:141
30312321230,8sleep342-21ksoftirqd/310:51:533
31359921220,3sleep00-21swapper/011:20:210
29111321130,3sleep20-21swapper/210:20:002
28350521080,4sleep00-21swapper/009:59:530
31285421060,4sleep33056-21PK-Backend11:20:123
2835552960,3sleep20-21swapper/210:00:002
139099910,77rtkit-daemon0-21swapper/307:08:513
22282026939,25sleep00-21swapper/007:06:190
22283226242,14sleep20-21swapper/207:06:292
2337482520,3sleep00-21swapper/007:35:230
3060242510,4sleep23056-21PK-Backend11:00:142
2903942490,2sleep00-21swapper/010:15:220
139099380,3rtkit-daemon0-21swapper/307:11:193
22334699294,22cyclictest251726-21cron08:30:002
139099270,4rtkit-daemon1389-21rtkit-daemon11:48:491
139099270,4rtkit-daemon1389-21rtkit-daemon11:48:491
139099270,4rtkit-daemon1389-21rtkit-daemon11:39:161
139099270,4rtkit-daemon1389-21rtkit-daemon10:42:011
223338992621,3cyclictest321504-21idleruntime-cro11:45:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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