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2022-10-07 - 18:51

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 Fri Oct 07, 2022 12:50:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
275082601581,14sleep70-21swapper/707:06:227
276092523498,19sleep50-21swapper/507:07:495
275342520497,15sleep60-21swapper/607:06:456
257522507490,13sleep10-21swapper/107:05:041
277652495486,4sleep00-21swapper/007:10:000
275042451439,8sleep30-21swapper/307:06:183
277602406395,5sleep40-21swapper/407:09:564
276422328308,14sleep20-21swapper/207:08:172
253152850,0sleep20-21swapper/208:10:012
28204998179,1cyclictest12975-21sh10:00:014
28204998179,1cyclictest12975-21sh10:00:014
28202997574,0cyclictest20022-21sh08:00:002
2820299740,1cyclictest277-21systemd-journal10:00:012
2820299740,1cyclictest277-21systemd-journal10:00:002
28207997069,0cyclictest22643-21sh08:05:007
28200996867,0cyclictest5904-21cron12:00:010
28207996664,1cyclictest3498-21needreboot08:30:327
28206996261,0cyclictest26279-21sh09:19:596
28205995957,1cyclictest5783-21latency_hist07:29:595
28200995654,1cyclictest2766-21cat11:50:340
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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