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2025-11-07 - 23:27

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 Fri Nov 07, 2025 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2011959994034,4cyclictest2037729-21latency_hist07:35:013
2011955994033,5cyclictest2261010-21/usr/sbin/munin11:10:182
2011955993834,3cyclictest2017321-21kworker/u8:4+events_unbound07:35:022
2011954993128,2cyclictest2063941-21kworker/u8:2+flush-259:008:20:171
2011954993127,3cyclictest2224573-21/usr/sbin/munin10:35:161
2011955993027,2cyclictest2115446-21kworker/u8:1+flush-259:009:05:152
201195199300,28cyclictest2291679-21true11:40:000
2011959992926,2cyclictest2032557-21systemd-run07:30:013
2011954992825,2cyclictest2084058-21kworker/u8:0+flush-259:008:29:591
2011951992824,3cyclictest2255203-21kworker/u8:3+flush-259:011:15:190
2011951992822,3cyclictest2203786-21latency_hist10:15:000
2011959992723,3cyclictest2338398-21kworker/u8:1+flush-259:012:25:003
2011955992723,3cyclictest2193071-21kworker/u8:4+events_unbound10:15:142
2011954992723,3cyclictest2245149-21kworker/u8:1+flush-259:011:20:001
2011954992721,4cyclictest2209159-21/usr/sbin/munin10:20:151
2011955992622,3cyclictest2048728-21kworker/u8:1+events_unbound08:11:282
2011955992622,2cyclictest2011971-21kworker/u8:2+flush-259:007:20:012
2011954992621,3cyclictest2156739-21kworker/u8:0+flush-259:010:05:161
2011951992518,5cyclictest2047571-21ntpq07:40:200
2011959992418,4cyclictest2156504-21latency_hist09:30:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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