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2026-03-11 - 10:14

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 Wed Mar 11, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
700219994639,5cyclictest252-21systemd-journal20:40:002
700219993934,3cyclictest996217-21latency_hist23:55:012
700219993934,3cyclictest996217-21latency_hist23:55:002
700213993533,1cyclictest845218-21fwupd21:30:020
700223993428,4cyclictest903354-21diskstats22:25:123
700223993427,5cyclictest252-21systemd-journal21:30:003
700217993429,3cyclictest252-21systemd-journal21:10:171
700213993431,2cyclictest725908-21kworker/u8:0+flush-259:020:45:010
700217993125,4cyclictest736632-21latency_hist19:45:011
700223993026,3cyclictest762784-21kworker/u8:2+flush-259:021:20:003
700223992923,4cyclictest897305-21latency_hist22:20:013
700219992925,2cyclictest923654-21kworker/u8:2+flush-259:022:45:162
700217992922,5cyclictest855504-21latency_hist21:40:001
700219992823,3cyclictest944259-21kworker/u8:3+flush-259:000:00:012
700217992822,4cyclictest1006941-21latency_hist00:05:001
700219992724,2cyclictest762784-21kworker/u8:2+flush-259:021:00:002
700219992723,3cyclictest778256-21kworker/u8:3+flush-259:020:35:012
700217992723,3cyclictest913467-21kworker/u8:0+flush-259:000:05:171
700217992722,3cyclictest252-21systemd-journal21:19:591
700219992620,4cyclictest700135-21latency_hist19:10:012
700217992614,9cyclictest965607-21/usr/sbin/munin23:25:141
700213992623,2cyclictest944259-21kworker/u8:3+events_unbound23:40:160
700213992620,4cyclictest871484-21latency_hist21:55:010
700213992619,5cyclictest950070-21cp23:10:000
700213992522,2cyclictest913467-21kworker/u8:0+flush-259:022:45:170
700223992419,3cyclictest252-21systemd-journal22:10:003
700219992418,4cyclictest809079-21latency_hist20:55:002
70021399241,20cyclictest1-21systemd21:25:000
700223992320,2cyclictest710735-21apt-get19:20:123
700223992318,3cyclictest840023-21latency_hist21:25:003
700217992320,2cyclictest694595-21kworker/u8:0+flush-259:019:14:591
700213992317,4cyclictest850798-21diskstats21:35:140
700213992317,4cyclictest509-21rs:main0
700223992218,3cyclictest887203-21kworker/u8:1+flush-259:023:00:153
700223992218,3cyclictest509-21rs:main3
700219992219,2cyclictest725908-21kworker/u8:0+events_unbound19:45:212
700217992214,6cyclictest777366-21ntpq20:20:221
700213992219,2cyclictest1027569-21kworker/u8:0+flush-259:000:40:010
700213992218,3cyclictest840050-21kworker/u8:3+flush-259:021:45:000
700213992217,4cyclictest731560-21cat19:40:010
700223992118,2cyclictest871713-21kworker/u8:4+flush-259:022:05:003
700219992116,4cyclictest798797-21kworker/u8:1+flush-259:021:25:232
700217992117,3cyclictest944259-21kworker/u8:3+flush-259:023:45:001
700217992117,2cyclictest0-21swapper/122:45:001
700217992116,3cyclictest752707-21/usr/sbin/munin20:00:151
700217992112,7cyclictest0-21swapper/121:55:001
700219992014,4cyclictest252-21systemd-journal20:27:182
700217992015,3cyclictest509-21rs:main1
700217992013,6cyclictest0-21swapper/123:10:001
700213992016,3cyclictest1001474-21gpgv00:00:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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