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2025-07-09 - 08:02

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackeslot6s.osadl.org (updated Wed Jul 09, 2025 00:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3832388998174,4cyclictest231ktimers/120:55:011
3832390997127,37cyclictest0-21swapper/221:00:182
383239099694,10cyclictest3886991-21apt-get00:30:012
3832390996915,44cyclictest0-21swapper/222:45:022
3832390996826,32cyclictest0-21swapper/222:35:182
3832390996629,31cyclictest3857971-21grep21:35:312
3832390996619,40cyclictest0-21swapper/219:30:192
3832386996655,5cyclictest131ktimers/020:50:150
3832390996527,31cyclictest3861482-21grep21:55:282
3832390996526,33cyclictest0-21swapper/223:20:332
3832390996522,34cyclictest0-21swapper/221:45:282
3832388996512,19cyclictest3877889-21/usr/sbin/munin23:35:211
3832390996431,29cyclictest0-21swapper/220:40:002
3832390996421,37cyclictest0-21swapper/220:20:302
3832390996419,4cyclictest0-21swapper/200:05:292
3832390996419,4cyclictest0-21swapper/200:05:292
3832390996132,25cyclictest168450irq/135-8000000.ethernet-tx219:40:252
3832390996118,35cyclictest0-21swapper/219:45:292
3832390996014,7cyclictest0-21swapper/221:30:012
3832390996014,6cyclictest0-21swapper/222:00:242
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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