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2026-07-02 - 01:37

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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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 Wed Jul 01, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
65453321250,2sleep20-21swapper/207:30:122
69234221140,4sleep0161rcuc/009:20:000
7032152950,2sleep00-21swapper/009:50:010
7032152950,2sleep00-21swapper/009:50:000
6457432810,7sleep10-21swapper/107:05:281
64625027651,15sleep30-21swapper/307:10:003
64476726444,13sleep00-21swapper/007:05:030
64588426141,14sleep20-21swapper/207:05:302
7141722440,2sleep20-21swapper/210:20:132
7260042420,2sleep00-21swapper/010:55:000
6635412420,4sleep13056-21PK-Backend07:55:171
6469332410,3sleep00-21swapper/007:10:120
7421682380,3sleep13056-21PK-Backend11:40:121
7093702340,3sleep00-21swapper/010:05:200
6634152310,3sleep00-21swapper/007:55:150
646368993010,6cyclictest704135-21ntp_states09:50:200
7609732280,4chrt0-21swapper/012:35:010
646368992814,3cyclictest669670-21sh08:15:010
139099280,20rtkit-daemon3056-21PK-Backend12:20:180
7228642270,4sleep30-21swapper/310:45:143
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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