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2026-04-21 - 21:42

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 Tue Apr 21, 2026 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
242220421050,4sleep00-21swapper/008:15:130
245042221010,3sleep00-21swapper/009:35:160
139099840,75rtkit-daemon0-21swapper/107:07:411
239729426741,17sleep20-21swapper/207:05:222
239792426546,13sleep00-21swapper/007:07:050
239790726343,14sleep30-21swapper/307:06:523
25027122470,2sleep30-21swapper/312:05:133
24097912400,3chrt3056-21PK-Backend07:40:141
239829599321,16cyclictest2481057-21munin-run11:05:002
239829599321,16cyclictest2481057-21munin-run11:04:592
2398295992812,5cyclictest2502382-21apt12:05:112
239828999280,10cyclictest2514492-21latency_hist12:40:020
24830492270,12sleep342-21ksoftirqd/311:10:113
2398295992714,11cyclictest2452322-21ntp_states09:40:192
239829599270,15cyclictest2441238-21expr09:10:142
24040542260,3sleep00-21swapper/007:25:010
239829599264,5cyclictest1968-21Xorg09:25:002
2398295992613,11cyclictest2472421-21unin-run10:40:012
239829599261,10cyclictest2450013-21cpuspeed_turbos09:35:132
239829599260,13cyclictest2422407-21sed08:15:162
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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