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2025-04-02 - 05:43

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 Wed Apr 02, 2025 00:44:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
854722940,5sleep00-21swapper/019:05:130
84482240164,24sleep10-21swapper/119:05:071
103922236162,23sleep30-21swapper/319:09:493
101152228153,25sleep20-21swapper/219:06:132
2286421590,3sleep11050599cyclictest23:50:201
296682550,4sleep121-21rcuc/121:10:241
224952510,1sleep20-21swapper/222:20:132
1050199421,29cyclictest18724-21/usr/sbin/munin23:40:170
1050199402,34cyclictest2567-40dnf00:22:310
1050199401,27cyclictest4305-21/usr/sbin/munin23:00:160
1050199401,26cyclictest28390-21basename21:10:010
1050199401,24cyclictest836-21runrttasks22:30:170
1050599394,28cyclictest0-21swapper/122:45:421
1050199396,21cyclictest86750irq/128-enp1s0-21:15:120
1050199391,26cyclictest14064-21processes21:55:250
1050199386,22cyclictest17610-21/usr/sbin/munin20:45:270
1050199384,24cyclictest24569-21/usr/sbin/munin19:40:260
1050199381,29cyclictest0-21swapper/000:33:270
1050199381,24cyclictest86750irq/128-enp1s0-20:20:200
1050199379,13cyclictest7782-21munin-run00:40:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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