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2026-05-16 - 18:33

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 Sat May 16, 2026 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1781388994542,2cyclictest75-21kswapd011:13:511
1781388994441,2cyclictest2086885-21apt-get12:04:271
1781394994340,2cyclictest75-21kswapd011:13:523
1781394993833,3cyclictest2009023-21latency_hist10:50:003
1781394993329,3cyclictest2024707-21/usr/sbin/munin11:05:243
1781392993327,4cyclictest1946642-21apt-get09:50:022
1781392993230,1cyclictest1915682-21kworker/2:2+pm11:13:482
1781388993226,4cyclictest1905322-21latency_hist09:10:001
1781388993125,4cyclictest1781302-21latency_hist07:10:001
178138599311,28cyclictest1-21systemd09:45:010
1781392993023,5cyclictest252-21systemd-journal07:40:002
1781388993026,3cyclictest1848436-21kworker/u8:2+flush-259:009:00:011
1781385993024,4cyclictest1801937-21latency_hist07:30:010
1781392992912,5cyclictest1884779-21awk08:50:002
1781388992923,4cyclictest2118018-21latency_hist12:35:011
1781388992922,5cyclictest2029625-21latency_hist11:10:011
1781392992821,5cyclictest1978044-21latency_hist10:20:002
1781385992824,3cyclictest2055734-21apt-get11:35:120
1781388992622,3cyclictest1728295-21kworker/u8:4+flush-259:009:20:241
1781385992622,3cyclictest75-21kswapd011:13:520
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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