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2025-01-18 - 12:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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.

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 rack4slot1s.osadl.org (updated Sat Jan 18, 2025 00:43:57)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2806521260,2chrt28067-21fschecks_time00:27:170
2806521260,2chrt28067-21fschecks_time00:27:170
2593321260,2sleep00-21swapper/000:22:110
2593321260,2sleep00-21swapper/000:22:110
116102930,2chrt11611-21sed21:52:101
116102930,2chrt11611-21sed21:52:101
223252680,3sleep30-21swapper/322:27:053
97752630,3sleep30-21swapper/321:47:143
97752630,3sleep30-21swapper/321:47:143
327432580,3sleep30-21swapper/300:42:203
327432580,3sleep30-21swapper/300:42:203
316932530,3sleep20-21swapper/200:37:282
205832530,2sleep20-21swapper/220:47:152
205832530,2sleep20-21swapper/220:47:152
322232510,4chrt0-21swapper/221:17:222
322232510,4chrt0-21swapper/221:17:222
19000995118,27cyclictest19024-21systemd-journal22:47:140
231042500,3sleep20-21swapper/222:27:212
231042500,3sleep20-21swapper/222:27:212
18242500,2chrt1827-21grep23:02:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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