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2026-08-31 - 06:02

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 Mon Aug 31, 2026 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12554352600,4chrt0-21swapper/123:17:371
12266052550,3sleep3575-21kworker/3:2+events22:47:373
1007792995038,9cyclictest275-21systemd-journal22:45:001
1007792994536,7cyclictest1138664-21apt-get21:20:001
1007792994439,3cyclictest1163484-21kworker/u8:2+events_unbound21:45:001
1007792994435,6cyclictest1178504-21latency_hist22:00:001
1007792994237,4cyclictest1069521-21kworker/u8:2+flush-8:021:22:341
1007792994232,8cyclictest275-21systemd-journal21:52:321
1007792994232,8cyclictest275-21systemd-journal21:52:321
1007792994133,6cyclictest969850-21kworker/u8:1+flush-8:019:57:421
100778999411,38cyclictest1-21systemd00:30:000
100778999411,38cyclictest1-21systemd00:30:000
1007796994023,15cyclictest1183150-21unixbench_multi22:02:482
1007792994034,4cyclictest275-21systemd-journal19:12:321
1007792994034,4cyclictest275-21systemd-journal19:12:321
1007789994032,6cyclictest1138673-21latency_hist21:20:000
1007789994031,6cyclictest1297816-21latency_hist00:00:010
1007796993921,16cyclictest275-21systemd-journal00:31:322
1007796993921,16cyclictest275-21systemd-journal00:31:322
1007792993934,3cyclictest1014821-21kworker/u8:2+flush-8:019:42:461
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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