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2022-07-05 - 08:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #3

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 Xeon E3-1270V2 @3500 MHz, Linux 5.4.17-rt9 (Profile)

Latency plot of shadow in rack #1, slot #3
Note that this system runs a non-RT kernel.
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 10 highest latencies:
System rack1slot3s.osadl.org (updated Tue May 26, 2020 00:45:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14699916690,1668cyclictest1204-21snmpd19:33:437
14429916550,1654cyclictest1204-21snmpd23:49:350
14429916532,1650cyclictest1204-21snmpd21:44:090
14429916491,1647cyclictest1204-21snmpd21:34:070
14539916471,1645cyclictest29729-21sensors20:05:083
14539916470,1646cyclictest17480-21sensors19:40:093
14569916462,1643cyclictest1204-21snmpd00:09:374
14539916410,1640cyclictest10268-21sensors22:45:103
14539916400,1639cyclictest2939-21sensors19:10:093
14509916402,1637cyclictest1204-21snmpd23:54:362
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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