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2026-04-18 - 07:01

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 here to display the system's profile data or here to proceed to next system.
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 Sat Apr 18, 2026 00:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
40630822530,9sleep20-21swapper/219:05:262
40574822500,16sleep013-21ksoftirqd/019:05:150
45353521260,3sleep30-21swapper/321:20:173
42913921240,3sleep13056-21PK-Backend20:10:181
51742621150,3sleep342-21ksoftirqd/300:20:213
40607127455,11sleep10-21swapper/119:05:211
139099740,61rtkit-daemon0-21swapper/319:08:533
5121452430,8sleep2331rcuc/200:05:212
4922542330,3sleep03056-21PK-Backend23:10:180
4518812270,4sleep13056-21PK-Backend21:15:181
4162252270,4sleep13056-21PK-Backend19:35:011
139099270,4rtkit-daemon1389-21rtkit-daemon23:20:222
4440182250,3sleep0444021-21sh20:55:000
40696499250,23cyclictest522859-21chrt00:37:202
406967992414,9cyclictest978-21snmpd00:16:163
406967992412,10cyclictest978-21snmpd00:11:153
406967992315,6cyclictest452080-21python321:15:213
40696799231,19cyclictest475206-21apt-get22:25:003
40696499230,3cyclictest435392-21munin-run20:30:002
4654782220,6sleep30-21swapper/321:55:133
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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