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2023-01-31 - 04:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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 Atom E3825 @1333 MHz, Linux 4.9.47-rt37 (Profile)

Latency plot of shadow in rack #9, 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 rack9slot4s.osadl.org (updated Tue Jan 31, 2023 00:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
242619912431201,30cyclictest0-21swapper/019:28:490
240392603557,31sleep00-21swapper/019:23:150
238842569522,31sleep10-21swapper/119:21:381
130282800,5sleep1201rcuc/100:35:231
24262996356,4cyclictest26005-21chrt19:28:491
284862521,39sleep128576-21cat21:00:001
98282450,5sleep1201rcuc/121:35:211
2426299404,8cyclictest81rcu_preempt00:25:471
223822401,34sleep122542-21latency_hist23:35:001
2426299391,15cyclictest49462switchtime21:20:381
24261993913,21cyclictest7078-21cron00:20:000
37082371,32sleep13775-21wget22:45:181
257362361,30sleep124893-21/usr/sbin/munin20:50:341
2426199363,26cyclictest22906-21diskstats23:35:340
24261993610,9cyclictest13676-21needreboot00:35:360
2426199354,16cyclictest15438-21iostat_ios00:40:370
2426199351,22cyclictest3044-21/usr/sbin/munin22:40:440
86852341,29sleep08732-21grep20:05:320
60102340,7sleep02426199cyclictest20:00:160
263702341,29sleep026432-21cut22:20:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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