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2023-03-20 - 19:18

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #7

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 N2930 @1833 MHz, Linux 5.10.47-rt46 (Profile)

Latency plot of shadow in rack #4, slot #7
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 --smi -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 rack4slot7s.osadl.org (updated Mon Mar 20, 2023 12:43:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
63692467400,50sleep00-21swapper/007:06:130
63642457392,52sleep10-21swapper/107:06:101
3074121470,3sleep130745-21timerwakeupswit12:20:041
233712820,1chrt23366-21apt-get09:14:551
109552650,2chrt0-21swapper/111:30:051
81442530,4sleep10-21swapper/108:34:541
217792490,1sleep021781-21sh09:09:520
307562420,2chrt0-21swapper/008:09:500
85132410,1chrt8511-21python08:34:590
216312350,16sleep122-21ksoftirqd/109:09:511
6854993313,16cyclictest34850irq/91-enp1s0-r12:24:551
685399324,17cyclictest21126-21diskmemload12:29:520
685399304,16cyclictest21126-21diskmemload09:39:530
6853992611,7cyclictest0-21swapper/008:44:540
685399253,16cyclictest5812-21taskset09:51:050
314752250,2sleep00-21swapper/009:34:570
685399244,12cyclictest21126-21diskmemload11:49:530
685399243,15cyclictest0-21swapper/011:44:550
685499232,16cyclictest496-21runrttasks10:44:541
685399221,8cyclictest22829-21snmpd11:35:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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