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2025-12-21 - 09:34

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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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 Dec 21, 2025 00:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
61809521120,3sleep20-21swapper/221:55:302
6611082980,5sleep00-21swapper/000:00:160
5733962970,5sleep20-21swapper/219:50:222
197399820,11rtkit-daemon4497-21PK-Backend19:26:093
197399820,11rtkit-daemon4497-21PK-Backend19:26:093
197399810,68rtkit-daemon0-21swapper/219:05:192
55662227848,20sleep10-21swapper/119:05:071
55827599660,61cyclictest1972-21rtkit-daemon22:06:200
55805426444,14sleep00-21swapper/019:08:520
55777626439,20sleep30-21swapper/319:05:503
5592952620,13sleep0131ksoftirqd/019:10:280
6437312570,17sleep234-21ksoftirqd/223:10:192
6437312570,17sleep234-21ksoftirqd/223:10:192
558279994837,8cyclictest26-21ksoftirqd/122:46:091
5697672470,8sleep14497-21PK-Backend19:40:191
558285994725,18cyclictest1054-21snmpd20:56:213
558279994724,19cyclictest605323-21hddtemp_smartct21:20:191
55827999471,42cyclictest1972-21rtkit-daemon21:03:171
558281994623,18cyclictest574574-21/usr/sbin/munin19:55:322
55827999459,18cyclictest26-21ksoftirqd/123:15:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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