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2026-05-21 - 00:04

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 Wed May 20, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
132439622150,3sleep375-21kworker/3:1+events10:40:003
132439622150,3sleep375-21kworker/3:1+events10:40:003
13931972910,5chrt0-21swapper/211:46:032
14366502760,3chrt0-21swapper/112:30:571
1113644996042,15cyclictest1413632-21latency_hist12:10:000
12588462580,1sleep10-21swapper/109:30:561
11499022580,2chrt1149905-21unixbench_singl07:41:041
1113644995748,6cyclictest1230161-21latency_hist09:05:010
1113646995549,4cyclictest1070626-21kworker/u8:1+events_unbound07:15:051
1113644995337,14cyclictest1240332-21/usr/sbin/munin09:15:570
1113644995337,14cyclictest1240332-21/usr/sbin/munin09:15:560
1113646995243,7cyclictest1704890-21systemd-journal09:15:001
1113646995242,7cyclictest1259874-21kworker/u8:3+flush-8:011:55:591
1113646995242,7cyclictest1259874-21kworker/u8:3+flush-8:011:55:591
1113651995040,8cyclictest1195345-21cp08:30:002
1113646995042,6cyclictest1125624-21kworker/u8:0+flush-8:008:40:581
11928332490,3chrt201rcuc/008:25:550
1113646994940,7cyclictest1384009-21latency_hist11:40:011
1113644994937,9cyclictest1704890-21systemd-journal07:55:000
1113644994924,22cyclictest1343366-21ntpq10:56:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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