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2026-07-17 - 22:06

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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 50 highest latencies:
System rack3slot3s.osadl.org (updated Fri Jul 17, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
33199792168109,55sleep30-21swapper/33
332006828563,12sleep10-21swapper/11
331990428366,10sleep20-21swapper/22
331989727552,16sleep00-21swapper/00
35541612310,3sleep23491354-21kworker/u16:0+kvfree_rcu_reclaim2
34111322241,19sleep03411135-21sshd-auth0
374936122310,8sleep03448094-21diskmemload0
3320334992111,7cyclictest0-21swapper/33
332033499211,16cyclictest0-21swapper/33
332033499211,16cyclictest0-21swapper/33
332033499210,19cyclictest0-21swapper/33
332033499210,18cyclictest0-21swapper/33
332033499201,16cyclictest0-21swapper/33
332033499201,15cyclictest66950irq/132-enp1s0-TxRx-33
332033499201,15cyclictest66950irq/132-enp1s0-TxRx-33
332033499201,15cyclictest66950irq/132-enp1s0-TxRx-33
332033499201,15cyclictest0-21swapper/33
332033499201,14cyclictest0-21swapper/33
36889782191,7sleep23448094-21diskmemload2
332033499191,16cyclictest0-21swapper/33
332033499191,15cyclictest0-21swapper/33
332033499191,15cyclictest0-21swapper/33
332033499191,15cyclictest0-21swapper/33
332033499191,14cyclictest0-21swapper/33
332033499191,14cyclictest0-21swapper/33
332033499191,14cyclictest0-21swapper/33
332033499191,14cyclictest0-21swapper/33
332033499191,14cyclictest0-21swapper/33
332033499191,14cyclictest0-21swapper/33
332033499191,14cyclictest0-21swapper/33
332033499191,14cyclictest0-21swapper/33
3320334991910,6cyclictest3369257-21chrt3
3320334991910,6cyclictest0-21swapper/33
3320334991910,6cyclictest0-21swapper/33
332033499190,15cyclictest66950irq/132-enp1s0-TxRx-33
37238832181,2sleep10-21swapper/11
37057612181,3sleep20-21swapper/22
36754392181,13sleep03675494-21kthreadcore0
36713782181,3sleep03671389-21sh0
36384022180,2sleep00-21swapper/00
36301142181,14sleep23448094-21diskmemload2
3320334991816,1cyclictest0-21swapper/33
3320334991812,3cyclictest0-21swapper/33
3320334991811,5cyclictest0-21swapper/33
332033499181,14cyclictest0-21swapper/33
332033499181,14cyclictest0-21swapper/33
332033499181,14cyclictest0-21swapper/33
332033499181,14cyclictest0-21swapper/33
332033499181,14cyclictest0-21swapper/33
3320334991811,3cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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