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2025-04-02 - 04:58

OSADL QA Farm on Real-time of Mainline Linux

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

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 rackeslot4s.osadl.org (updated Wed Apr 02, 2025 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
612282994336,5cyclictest892421-21latency_hist00:25:011
612287994036,3cyclictest724186-21kworker/u8:4+flush-259:021:35:152
612287994035,3cyclictest876810-21kworker/u8:2+events_unbound00:15:012
612287993834,3cyclictest659233-21kworker/u8:4+flush-259:020:20:242
612287993629,5cyclictest638202-21latency_hist19:35:012
612282993630,4cyclictest805367-21latency_hist22:40:021
612282993532,2cyclictest676268-21kworker/u8:3+flush-259:020:15:261
612287993330,2cyclictest794529-21kworker/u8:0+flush-259:022:45:002
612282993328,3cyclictest893707-21kworker/u8:4+flush-259:000:30:181
612279993327,4cyclictest729170-21latency_hist21:10:010
612287993229,2cyclictest848942-21kworker/u8:3+flush-259:023:50:002
612287993229,2cyclictest848942-21kworker/u8:3+flush-259:023:49:592
612287993228,3cyclictest724186-21kworker/u8:4+flush-259:021:40:242
612287993127,3cyclictest848942-21kworker/u8:3+events_unbound23:45:002
612287993127,3cyclictest843096-21kworker/u8:0+events_unbound23:35:242
612287993127,3cyclictest811215-21kworker/u8:1+events_unbound23:00:222
612287993127,3cyclictest638436-21kworker/u8:0+flush-259:019:35:252
612287993125,4cyclictest3000860-21systemd-journal20:09:232
612279993124,5cyclictest697961-21diskstats20:40:150
612289993023,5cyclictest843717-21latency_hist23:30:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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