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2026-04-12 - 22:43

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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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 50 highest latencies:
System rackeslot4s.osadl.org (updated Sun Apr 12, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2009145994237,4cyclictest2014511-21kworker/u8:4+flush-259:007:35:003
2009135994238,3cyclictest509-21rs:main0
2009135993832,4cyclictest2262349-21ntpq11:10:210
2009137993733,3cyclictest2148960-21kworker/u8:2+flush-259:009:25:171
2009145993631,4cyclictest2242085-21apt-get10:55:013
2009135993428,4cyclictest2118231-21apt-get08:55:120
2009137993329,3cyclictest2102733-21kworker/u8:2+flush-259:008:45:261
2009137993328,4cyclictest2014511-21kworker/u8:4+flush-259:007:35:191
2009137993327,4cyclictest2195752-21latency_hist10:10:001
2009141993226,4cyclictest2206034-21latency_hist10:20:012
2009137993225,5cyclictest2268343-21latency_hist11:20:011
2009145993127,3cyclictest2283823-21kworker/u8:0+flush-259:012:10:153
2009145993125,4cyclictest2201155-21apt-get10:15:123
2009141993127,3cyclictest1955614-21kworker/u8:3+flush-259:007:45:172
2009145993024,4cyclictest2014511-21kworker/u8:4+flush-259:007:40:193
2009145993023,4cyclictest509-21rs:main3
2009141993024,3cyclictest252-21systemd-journal07:41:172
2009135993026,3cyclictest2325888-21apt-get12:15:110
2009135993025,4cyclictest2045595-21apt-get07:45:120
2009141992923,4cyclictest509-21rs:main2
2009137992927,1cyclictest2236573-21fwupd10:46:001
2009145992824,3cyclictest2185043-21kworker/u8:2+flush-259:010:10:203
2009145992823,4cyclictest2211238-21kworker/u8:0+flush-259:010:35:173
2009145992822,4cyclictest2294173-21kworker/u8:1+events_unbound11:50:183
2009141992823,4cyclictest2226898-21apt-get10:40:122
2009135992822,4cyclictest2018620-21ntpq07:15:200
2009135992819,7cyclictest252-21systemd-journal08:44:590
2009145992720,5cyclictest2242295-21apt-key10:55:003
2009137992722,4cyclictest252-21systemd-journal12:20:001
2009135992723,3cyclictest2035215-21apt-get07:35:140
2009135992722,4cyclictest2325455-21gpgv12:15:010
2009145992620,4cyclictest252-21systemd-journal08:25:173
2009141992619,5cyclictest252-21systemd-journal08:40:002
2009145992521,3cyclictest2294173-21kworker/u8:1+events_unbound11:45:163
2009145992520,4cyclictest2252897-21kworker/u8:3+events_unbound11:25:123
2009145992518,5cyclictest252-21systemd-journal07:50:173
2009137992521,3cyclictest2195777-21kworker/u8:1+events_unbound10:55:001
2009137992521,3cyclictest2076922-21apt-get08:15:101
2009137992521,3cyclictest1955614-21kworker/u8:3+flush-259:007:45:181
2009137992520,4cyclictest1955614-21kworker/u8:3+flush-259:007:15:161
2009137992519,4cyclictest2097627-21apt-get08:35:121
2009135992519,4cyclictest2060898-21cat08:00:010
200913599251,12cyclictest1-21systemd12:02:180
2009145992419,3cyclictest2014511-21kworker/u8:4+flush-259:007:25:163
2009141992416,7cyclictest0-21swapper/209:45:002
2009137992420,3cyclictest2331044-21/usr/sbin/munin12:20:141
2009137992420,3cyclictest2061410-21/usr/sbin/munin08:00:201
2009137992418,4cyclictest2164688-21apt-get09:40:121
2009145992320,2cyclictest2283823-21kworker/u8:0+events_unbound12:15:183
2009145992319,3cyclictest2159470-21kworker/u8:4+flush-259:010:20:193
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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