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2026-04-18 - 00:12

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 Fri Apr 17, 2026 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12370422480,6sleep0123687-21munin-run07:10:010
22559521300,4sleep13056-21PK-Backend11:55:201
12343227539,9sleep30-21swapper/307:07:113
12301126843,17sleep20-21swapper/207:05:252
12341526242,14sleep10-21swapper/107:06:571
1777762560,3sleep13056-21PK-Backend09:40:141
1493782480,1sleep30-21swapper/308:20:133
1986942440,3sleep00-21swapper/010:40:130
2099292310,9sleep013-21ksoftirqd/011:10:200
1728152300,3sleep0172821-21needreboot09:25:170
12379299299,4cyclictest183428-21ls09:55:202
123792992911,16cyclictest134944-21cpu07:40:122
1516822280,8sleep126-21ksoftirqd/108:25:201
12379299287,4cyclictest193189-21find10:25:102
12379299283,21cyclictest154029-21apt-get08:35:032
12379299282,5cyclictest0-21swapper/208:25:112
12379299282,4cyclictest0-21swapper/208:55:132
123792992811,15cyclictest177325-21/usr/sbin/munin09:40:212
123792992811,15cyclictest144069-21cat08:05:142
12379299278,5cyclictest236932-21sed12:30:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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