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2025-04-24 - 14:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Thu Apr 24, 2025 12:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
174332240164,24sleep30-21swapper/307:09:533
172732240163,24sleep10-21swapper/107:07:501
171332238161,25sleep00-21swapper/007:06:000
173432203164,26sleep20-21swapper/207:08:422
154621470,4sleep01753399cyclictest08:55:340
3079621280,2sleep20-21swapper/211:41:282
17546991111,108cyclictest0-21swapper/212:24:212
213822840,3sleep00-21swapper/009:50:100
298992570,4sleep21754699cyclictest07:35:162
17540994410,23cyclictest836-21runrttasks12:16:231
17540993818,16cyclictest7550-21/usr/sbin/munin12:10:131
17540993813,12cyclictest1506-21latency_hist11:55:011
17540993812,9cyclictest30223-21latency_hist10:15:011
1754699376,7cyclictest13684-21runrttasks12:29:192
1754699371,12cyclictest0-21swapper/209:57:022
1754699371,12cyclictest0-21swapper/209:57:022
17540993713,9cyclictest24716-21/usr/sbin/munin11:30:091
17540993616,7cyclictest14518-21sshd08:14:481
17546993512,3cyclictest4436-21/usr/sbin/munin09:05:212
17546993512,3cyclictest19843-21munin-node10:35:132
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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