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2024-11-23 - 17:28

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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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 rack5slot3s.osadl.org (updated Sat Nov 23, 2024 12:44:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
295702239162,24sleep20-21swapper/207:09:022
294732239162,24sleep00-21swapper/007:07:470
294142238163,23sleep30-21swapper/307:07:023
296432203165,24sleep10-21swapper/107:09:581
29746999490,3cyclictest0-21swapper/211:33:342
296062690,5sleep232-21ksoftirqd/208:20:152
153482570,7sleep3401ktimersoftd/309:00:223
166662530,3sleep10-21swapper/111:35:151
2975199406,24cyclictest32374-21latency12:10:203
2975199406,24cyclictest32374-21latency12:10:203
29746994036,3cyclictest0-21swapper/209:06:172
2975199386,11cyclictest10458-21unixbench_singl11:15:263
2975199377,22cyclictest0-21swapper/310:10:163
29751993716,12cyclictest30551-21/usr/sbin/munin12:05:253
2975199368,8cyclictest11825-21latency_hist08:55:013
29746993513,3cyclictest28072-21/usr/sbin/munin10:45:182
29746993511,5cyclictest0-21swapper/210:20:192
2975199349,9cyclictest21396-21cat11:45:193
29751993411,11cyclictest836-21runrttasks08:45:413
29751993410,7cyclictest26450-21kworker/u8:209:25:093
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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