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2026-04-19 - 21:31

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 Sun Apr 19, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
126827121150,4sleep0161rcuc/007:35:000
125786221120,19sleep20-21swapper/207:05:142
131336721080,12sleep30-21swapper/309:40:193
125867427039,25sleep00-21swapper/007:06:420
125784927044,16sleep10-21swapper/107:05:141
125872026343,13sleep30-21swapper/307:07:173
13159862610,3sleep342-21ksoftirqd/309:50:013
13284382510,1sleep20-21swapper/210:25:012
12860522490,8sleep234-21ksoftirqd/208:25:112
12705672470,1sleep30-21swapper/307:40:133
13612192420,3sleep10-21swapper/111:55:221
12861042290,3sleep33056-21PK-Backend08:25:113
139099260,4rtkit-daemon1389-21rtkit-daemon07:26:350
139099240,4rtkit-daemon1389-21rtkit-daemon07:21:310
139099240,15rtkit-daemon0-21swapper/208:45:242
1259093992314,7cyclictest978-21snmpd07:25:002
1259089992310,9cyclictest883-21dbus-daemon08:36:521
1259085992314,7cyclictest1291653-21df_inode08:40:120
13057802220,4sleep13056-21PK-Backend09:20:111
125909699225,15cyclictest1261224-21df07:15:033
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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