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2025-09-16 - 02:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack5slot4s.osadl.org (updated Tue Sep 16, 2025 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
37355352600,5sleep20-21swapper/219:25:532
3716365995937,19cyclictest3917190-21latency_hist22:30:010
3716374995745,9cyclictest4016348-21/usr/sbin/munin00:10:002
3716370995751,5cyclictest3917216-21kworker/u8:2+flush-8:022:56:011
3716370995651,3cyclictest3892465-21kworker/u8:0+events_unbound22:06:011
3716370995646,8cyclictest3768297-21cp20:00:001
3716365995444,7cyclictest3857871-21latency_hist21:30:010
3716370995346,5cyclictest3706633-21kworker/u8:3+flush-8:019:50:551
3716370995248,3cyclictest3706633-21kworker/u8:3+events_unbound19:15:471
3716370995247,4cyclictest3701477-21kworker/u8:2+events_unbound22:01:051
3716370995243,6cyclictest3952118-21latency_hist23:05:001
3716365995243,7cyclictest2583070-21systemd-journal19:25:460
3716365995240,9cyclictest3768186-21apt-get20:00:000
3716370995045,3cyclictest3907537-21kworker/u8:1+events_unbound00:11:051
3716370995045,3cyclictest3706633-21kworker/u8:3+events_unbound20:15:011
3716370995044,5cyclictest3706633-21kworker/u8:3+events_unbound19:25:471
3716370995042,6cyclictest3927321-21latency_hist22:40:011
3716365995042,6cyclictest4036129-21latency_hist00:30:000
3716365995042,6cyclictest4036129-21latency_hist00:30:000
3716365995042,5cyclictest3788170-21latency_hist20:20:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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