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2021-06-17 - 19:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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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Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz, Linux 4.19.191-rt80 (Profile)

Latency plot of shadow in rack #0, 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 10 highest latencies:
System rack0slot5s.osadl.org (updated Thu Jun 17, 2021 12:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7780899381377,3cyclictest136803-21turbostat09:09:557
77808993790,379cyclictest0-21swapper/709:29:557
7780899377375,2cyclictest220642-21turbostat11:54:557
7780899376374,2cyclictest235895-21turbostat12:24:557
7779499376374,2cyclictest0-21swapper/311:04:553
7780899374374,0cyclictest238434-21turbostat12:29:557
7780899374374,0cyclictest131711-21turbostat08:59:557
7780399372371,1cyclictest126635-21turbostat08:49:555
7778899369369,0cyclictest0-21swapper/108:49:551
7780899368368,0cyclictest0-21swapper/712:19:557
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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