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2025-11-13 - 05:39

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 Wed Nov 12, 2025 12:44:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
84127623180,9sleep32197014-21PK-Backend07:05:273
84182822400,6sleep2841827-21systemctl07:10:012
162399960,9rtkit-daemon1753-21gnome-shell09:31:392
9298152880,9sleep2929541-40apt-check11:15:162
84163828671,9sleep00-21swapper/007:08:220
162399780,6rtkit-daemon2197014-21PK-Backend09:50:272
162399700,10rtkit-daemon1622-21rtkit-daemon10:22:473
162399690,8rtkit-daemon1622-21rtkit-daemon12:09:563
84172726545,14sleep10-21swapper/107:09:321
84192999614,53cyclictest1622-21rtkit-daemon07:15:331
162399610,9rtkit-daemon1622-21rtkit-daemon12:17:483
9172902580,16sleep2331rcuc/210:40:312
8491272580,7chrt2197014-21PK-Backend07:28:292
841929995833,10cyclictest26-21ksoftirqd/110:50:221
8535812570,5chrt0-21swapper/007:40:220
841925995717,20cyclictest13-21ksoftirqd/011:15:010
162399550,8rtkit-daemon1622-21rtkit-daemon11:00:293
8555112540,7chrt2197014-21PK-Backend07:45:240
84193499540,18cyclictest945302-21ls12:00:023
84193499540,18cyclictest945302-21ls12:00:023
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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