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2023-01-29 - 11:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 AMD Ryzen XXXX @3300 MHz, Linux 4.18.7-rt5 (Profile)

Latency plot of shadow in rack #c, slot #3
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 rackcslot3s (updated Sun Jan 29, 2023 00:50:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
157182665644,16sleep40-21swapper/419:08:174
156192663645,12sleep60-21swapper/619:06:516
156812645629,12sleep30-21swapper/319:07:443
138292605589,12sleep10-21swapper/119:05:021
157232581565,12sleep00-21swapper/019:08:210
155502498480,12sleep20-21swapper/219:05:512
157792489468,15sleep70-21swapper/719:09:087
155892456445,6sleep50-21swapper/519:06:265
16281998582,2cyclictest3712-21cut23:10:225
16280997978,0cyclictest30919-21sh19:40:004
93492750,0sleep50-21swapper/521:10:005
16282997473,0cyclictest2414-21grep23:10:016
16282997472,1cyclictest22326-21tr23:50:176
134732580,0sleep00-21swapper/021:15:320
16279995753,2cyclictest879-21cron19:45:003
1627899550,19cyclictest282-21systemd-journal20:10:002
16278995452,1cyclictest8244-21sh20:00:002
16283995149,1cyclictest17862-21turbostat.cron22:35:007
16282995130,1cyclictest16004-21tr20:15:206
16281995149,1cyclictest28061-21cpuspeed_turbos20:40:175
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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