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2026-05-09 - 11:05

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 Sat May 09, 2026 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
131426421900,2sleep375-21kworker/3:1+events20:31:033
138019121800,5sleep30-21swapper/321:36:043
14858332800,2sleep3471rcuc/323:21:133
1231973997556,17cyclictest1561238-21apt-get00:40:001
1231973997362,8cyclictest1263525-21latency_hist19:40:011
1231973996442,20cyclictest1353071-21apt-get21:10:531
1231977996051,7cyclictest1342733-21gpgv21:00:012
1231973995648,5cyclictest280-21systemd-journal23:40:561
1231973995549,4cyclictest1372208-21kworker/u8:0+events_unbound21:56:061
1231973995536,6cyclictest1451785-21latency_hist22:50:001
13904412540,3chrt75-21kworker/3:1-events21:46:023
1231977995446,6cyclictest1501515-21cp23:40:002
13594872530,1sleep01359491-21grep21:16:020
1231973995337,4cyclictest1328132-21apt-get20:45:541
13697622500,3chrt0-21swapper/021:26:020
1231973995041,6cyclictest1412269-21latency_hist22:10:011
1231968995043,5cyclictest1417513-21apt-get22:15:530
1231973994927,9cyclictest1496209-21apt-get23:35:001
1231968994940,7cyclictest280-21systemd-journal20:40:000
1231973994639,5cyclictest1273726-21apt-get19:50:551
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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