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2026-03-14 - 12:28

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 Sat Mar 14, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1985984996056,2cyclictest2105007-21fwupd21:03:241
1985991994643,2cyclictest75-21kswapd021:03:233
1985988994239,1cyclictest2012143-21kworker/2:1+pm21:03:202
1985991994035,4cyclictest252-21systemd-journal19:29:593
1985984993732,3cyclictest2193474-21base6422:30:001
1985981993730,5cyclictest2225175-21latency_hist23:00:010
1985991993227,4cyclictest252-21systemd-journal23:49:593
1985984993128,2cyclictest2069396-21kworker/u8:0+flush-259:020:50:141
198598199310,30cyclictest1-21systemd19:39:590
1985991993027,2cyclictest2225435-21apt-get23:00:113
1985988992925,3cyclictest2157501-21kworker/u8:0+flush-259:022:05:002
1985984992925,3cyclictest252-21systemd-journal20:30:211
1985984992924,4cyclictest2177852-21latency_hist22:15:011
1985981992926,2cyclictest1942777-21kworker/u8:0+events_unbound19:30:130
1985988992723,3cyclictest2167587-21kworker/u8:2+flush-259:022:55:152
1985988992723,3cyclictest2136192-21kworker/u8:2+flush-259:021:45:002
1985981992723,3cyclictest2017518-21apt-get19:40:110
1985988992621,4cyclictest1980774-21kworker/u8:3+flush-259:020:00:152
1985988992620,4cyclictest252-21systemd-journal21:55:232
1985988992620,4cyclictest252-21systemd-journal21:55:232
1985991992420,3cyclictest2177709-21kworker/u8:3+flush-259:022:20:243
1985991992418,4cyclictest509-21rs:main3
1985991992417,5cyclictest2001509-21gpgv19:25:003
1985984992420,3cyclictest2002081-21apt-get19:25:121
1985981992421,2cyclictest2281730-21kworker/u8:3+flush-259:000:10:160
1985981992420,3cyclictest1942777-21kworker/u8:0+flush-259:019:10:130
1985981992419,3cyclictest509-21rs:main0
1985991992317,5cyclictest2219962-21latency_hist22:55:013
1985984992320,2cyclictest2115782-21kworker/u8:0+flush-259:021:35:131
1985984992319,3cyclictest2313250-21gpgv00:25:011
1985991992218,3cyclictest2064071-21kworker/u8:2+flush-259:020:35:223
1985991992217,4cyclictest2042967-21apt-get20:05:023
1985991992217,3cyclictest2069396-21kworker/u8:0+flush-259:020:50:173
1985991992216,4cyclictest1991090-21latency_hist19:15:003
1985981992219,2cyclictest2017279-21kworker/u8:2+flush-259:020:05:140
1985981992218,3cyclictest2167587-21kworker/u8:2+events_unbound23:10:130
1985981992215,5cyclictest2291732-21ntpq00:00:200
1985991992116,3cyclictest2053963-21/usr/sbin/munin20:15:143
1985991992115,4cyclictest252-21systemd-journal00:00:013
198598499217,8cyclictest2266370-21munin-run23:39:591
1985984992119,2cyclictest1942777-21kworker/u8:0+events_unbound19:30:231
1985984992118,2cyclictest2115782-21kworker/u8:0+flush-259:021:30:231
1985984992117,3cyclictest2204029-21apt-get22:40:021
1985984992117,3cyclictest1942777-21kworker/u8:0+flush-259:019:20:151
1985981992118,2cyclictest2287691-21kworker/u8:0+events_unbound00:30:140
1985981992117,3cyclictest2152163-21base6421:50:010
1985991992016,3cyclictest2100034-21kworker/u8:3+flush-259:021:20:163
1985988992016,3cyclictest2100034-21kworker/u8:3+flush-259:021:25:162
1985984992017,2cyclictest2318806-21kworker/u8:2+events_unbound00:35:011
1985984992017,2cyclictest2053356-21kworker/u8:0+events_unbound20:15:211
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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