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2026-04-17 - 00:10

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 Thu Apr 16, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
376756721110,4sleep23056-21PK-Backend08:00:202
38413102940,4sleep20-21swapper/211:30:162
374757328670,9sleep00-21swapper/007:05:190
374723727244,20sleep20-21swapper/207:05:142
374822026944,17sleep30-21swapper/307:07:073
374835326445,14sleep10-21swapper/107:08:511
38238862510,4sleep00-21swapper/010:40:140
38238862510,4sleep00-21swapper/010:40:140
37667112470,3sleep13056-21PK-Backend08:00:111
139099370,4rtkit-daemon3056-21PK-Backend11:33:511
139099370,3rtkit-daemon3056-21PK-Backend12:02:131
139099360,3rtkit-daemon3056-21PK-Backend12:33:101
38449642330,1sleep23844966-21grep11:40:182
139099260,4rtkit-daemon1389-21rtkit-daemon07:54:163
37648312250,5chrt0-21swapper/007:55:010
139099250,4rtkit-daemon1389-21rtkit-daemon08:53:172
3748589992418,5cyclictest3056-21PK-Backend10:48:113
3748589992416,6cyclictest3865104-21cron12:40:003
3748589992416,6cyclictest3865104-21cron12:40:003
3748589992320,2cyclictest3056-21PK-Backend12:26:183
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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