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2025-04-24 - 15:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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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: ondemand
Compare latency of primary with shadow system
Characteristics of the 10 highest latencies:
System rack5slot4s.osadl.org (updated Thu Apr 24, 2025 12:44:38)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2771299272268,3cyclictest25280-21kworker/u16:2+events_unbound07:39:111
2771099197188,8cyclictest0-21swapper/007:13:570
2771299120118,1cyclictest0-21swapper/107:13:571
274062118104,10sleep20-21swapper/207:08:262
274322116103,10sleep10-21swapper/107:08:441
272922116103,10sleep00-21swapper/007:06:550
273522115103,8sleep30-21swapper/307:07:433
27712998277,4cyclictest25280-21kworker/u16:2+events_unbound07:20:281
27712997874,3cyclictest25280-21kworker/u16:2+events_unbound11:30:221
27712997874,3cyclictest25280-21kworker/u16:2+events_unbound11:20:281
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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