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2026-04-20 - 21:38

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 here to display the system's profile data or here to proceed to next system.
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 Mon Apr 20, 2026 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
185258321320,3sleep20-21swapper/208:20:002
185094921210,3sleep10-21swapper/108:15:031
182604521010,4sleep234-21ksoftirqd/207:05:132
18704752990,4sleep13056-21PK-Backend09:10:171
18268482800,7sleep00-21swapper/007:05:270
182702227639,10sleep30-21swapper/307:06:323
182725826243,14sleep10-21swapper/107:09:361
19415482430,4sleep33056-21PK-Backend12:30:193
18798392410,2sleep00-21swapper/009:35:220
18709942380,1sleep31870993-21timerandwakeup09:10:233
139099350,3rtkit-daemon1389-21rtkit-daemon12:16:571
1827423992914,13cyclictest1852482-21unin-run08:20:013
182741599275,5cyclictest3056-21PK-Backend08:54:591
182742399261,1cyclictest3056-21PK-Backend11:10:003
1827423992520,4cyclictest42-21ksoftirqd/308:50:013
1827423992520,4cyclictest42-21ksoftirqd/308:50:013
1827415992516,6cyclictest1848712-21cron08:10:001
182741599242,10cyclictest1873661-21tr09:20:131
1827413992419,3cyclictest1935084-21nm-dispatcher12:12:130
139099240,3rtkit-daemon1389-21rtkit-daemon10:53:380
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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