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2026-03-31 - 15:06

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 Mar 31, 2026 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
281073521220,4sleep10-21swapper/120:25:221
278276128140,35sleep20-21swapper/219:09:492
139099790,70rtkit-daemon0-21swapper/119:05:531
278253527244,22sleep30-21swapper/319:06:543
278243526242,14sleep00-21swapper/019:05:380
28692232430,4sleep23056-21PK-Backend23:10:232
28616102350,2sleep30-21swapper/322:50:153
28418812290,2sleep33056-21PK-Backend21:55:183
28396722260,4sleep23056-21PK-Backend21:50:122
278293499261,22cyclictest883-21dbus-daemon20:56:433
139099260,4rtkit-daemon1389-21rtkit-daemon21:30:291
28585922250,3sleep23056-21PK-Backend22:40:202
139099250,4rtkit-daemon1389-21rtkit-daemon23:40:561
139099250,4rtkit-daemon1389-21rtkit-daemon20:14:561
2782934992318,3cyclictest2845199-21df22:05:133
2782928992321,1cyclictest0-21swapper/219:54:382
28698922220,4sleep13056-21PK-Backend23:15:121
28189522220,11sleep013-21ksoftirqd/020:50:160
2782934992220,1cyclictest3056-21PK-Backend23:46:403
2782934992219,2cyclictest3056-21PK-Backend21:51:223
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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