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2023-06-03 - 07:44

OSADL QA Farm on Real-time of Mainline Linux

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

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 
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x86 Intel Pentium N4200 @1100 MHz, Linux 5.9.1-rt20 (Profile)

Latency plot of shadow in rack #c, slot #4
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Command line: cyclictest -l100000000 -m -Sp99 -i200 -h400 -q
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 rackcslot4s.osadl.org (updated Sat Jun 03, 2023 00:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
168882282215,26sleep30-21swapper/319:05:183
181442244203,29sleep10-21swapper/119:06:211
184242243202,29sleep20-21swapper/219:08:522
182242239198,29sleep00-21swapper/019:07:040
2893921090,1sleep30-21swapper/323:10:273
229012590,4sleep00-21swapper/021:45:010
118362450,1sleep00-21swapper/020:05:280
93012440,3sleep3301rcuc/322:25:353
14992440,2sleep10-21swapper/120:55:211
205272360,1sleep10-21swapper/122:50:301
36862350,1sleep10-21swapper/123:25:261
68492330,1sleep0101rcuc/022:20:320
18809993112,3cyclictest18437-21idleruntime-cro21:35:003
18809992916,6cyclictest31320-21grep20:50:143
299242280,4sleep11880199cyclictest20:45:241
1880999282,21cyclictest28496-21python320:45:013
1880999281,22cyclictest3212-21turbostat22:14:593
1880999281,22cyclictest15157-21python320:15:003
18809992619,3cyclictest19161-40apt-check22:50:063
1879699262,16cyclictest18380-21runrttasks00:00:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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