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2022-12-04 - 23:54

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, slot #8

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 E3940 @1600 MHz, Linux 5.10.41-rt42 (Profile)

Latency plot of shadow in rack #a, slot #8
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 rackaslot8s.osadl.org (updated Sun Dec 04, 2022 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36512169106,27sleep10-21swapper/107:05:581
38982161102,29sleep30-21swapper/307:09:093
37572160100,28sleep00-21swapper/007:07:210
37292158103,27sleep20-21swapper/207:06:582
87112580,1sleep00-21swapper/011:15:350
99782560,1sleep20-21swapper/212:12:522
211492540,1sleep00-21swapper/010:59:330
254392510,1sleep10-21swapper/111:58:261
239662500,2sleep10-21swapper/109:10:091
280802490,2sleep122-21ksoftirqd/109:40:311
80162450,1sleep20-21swapper/210:47:392
187332450,4sleep018739-21cpuspeed_turbos11:25:140
252612430,2chrt0-21swapper/010:06:190
4237993937,1cyclictest0-21swapper/008:59:170
423799341,30cyclictest2856-21/usr/sbin/munin08:20:210
423799341,30cyclictest2856-21/usr/sbin/munin08:20:200
423799321,28cyclictest19856-21sh10:01:500
423799321,28cyclictest19856-21sh10:01:500
44182310,2sleep10-21swapper/112:08:091
424099311,27cyclictest28927-21taskset09:14:253
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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