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2023-01-31 - 05:50

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #5

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 Celeron G3900 @2800 MHz, Linux 5.4.59-rt36 (Profile)

Latency plot of shadow in rack #c, slot #5
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 rackcslot5s.osadl.org (updated Tue Jan 31, 2023 00:43:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1349428581,2sleep00-21swapper/019:05:220
1280726557,4sleep10-21swapper/119:05:101
1479499271,20cyclictest4568-21perf20:05:010
1479599260,1cyclictest30193-21taskset23:51:241
1479599251,10cyclictest26435-21apt-get21:00:151
1479599240,23cyclictest25487-21meminfo23:40:271
1479599235,4cyclictest0-21swapper/120:20:201
1479599230,22cyclictest12806-21meminfo00:30:241
1479599230,17cyclictest14782-21meminfo00:35:251
1479499230,22cyclictest32200-21meminfo22:35:190
1479599220,21cyclictest0-21swapper/100:25:211
1479499221,9cyclictest11800-21apt-get21:45:180
1479499221,11cyclictest32700-21apt-get00:00:200
1479499220,11cyclictest0-21swapper/019:45:180
14795992121,0cyclictest0-21swapper/120:31:251
1479599210,20cyclictest7027-21/usr/sbin/munin22:55:261
1479599210,19cyclictest28398-21/usr/sbin/munin21:05:241
1479499211,9cyclictest20852-21apt-get23:30:180
14794992119,1cyclictest626-21ls21:15:220
1479499210,20cyclictest18403-21meminfo22:00:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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