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2026-04-01 - 08:58

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 Apr 01, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
858465994540,3cyclictest1045684-21latency_hist22:10:020
858472994237,3cyclictest1020062-21kworker/u8:4+flush-259:022:49:591
858465994239,2cyclictest864112-21kworker/u8:0+flush-259:019:50:010
858477993932,5cyclictest1181750-21latency_hist00:25:002
858465993733,3cyclictest864112-21kworker/u8:0+flush-259:019:25:250
858465993629,5cyclictest1051520-21/usr/sbin/munin22:15:120
858472993532,2cyclictest1154644-21kworker/u8:3+events_unbound00:20:231
858465993533,1cyclictest1051069-21fwupd22:13:000
858465993532,2cyclictest1171259-21apt-get00:15:110
858472993427,4cyclictest993718-21latency_hist21:20:001
858480993321,3cyclictest972931-21apt-get21:00:143
858477993328,4cyclictest1171172-21cat00:15:012
858477993228,3cyclictest910489-21gpgv20:00:012
858477993227,3cyclictest1192285-40mandb00:33:202
858477993226,4cyclictest1108185-21/usr/sbin/munin23:10:222
858472993228,3cyclictest1154644-21kworker/u8:3+flush-259:023:55:211
858465993226,4cyclictest1019832-21latency_hist21:45:010
858477993126,4cyclictest1056507-21kworker/u8:0+flush-259:022:40:162
858477993123,5cyclictest252-21systemd-journal23:10:012
858472993128,2cyclictest1138974-21kworker/u8:1+flush-259:000:15:201
858472993127,2cyclictest951973-21kworker/u8:3+flush-259:022:05:231
858472993126,3cyclictest1020062-21kworker/u8:4+flush-259:022:50:251
858472993026,3cyclictest1019848-21kworker/u8:1+flush-259:021:50:231
858465993025,4cyclictest1123695-21/usr/sbin/munin23:25:140
858480992924,3cyclictest842726-21kworker/u8:2+flush-259:019:35:173
858480992923,4cyclictest252-21systemd-journal23:41:213
858472992926,2cyclictest1138974-21kworker/u8:1+flush-259:023:50:221
858472992925,3cyclictest842726-21kworker/u8:2+flush-259:019:20:001
858472992923,4cyclictest252-21systemd-journal20:15:001
858465992925,3cyclictest864112-21kworker/u8:0+events_unbound19:15:180
858465992925,3cyclictest826249-21kworker/u8:1+events_unbound19:30:250
858480992823,3cyclictest1035624-21/usr/sbin/munin22:00:143
858480992822,4cyclictest982993-21latency_hist21:10:003
858472992825,2cyclictest951973-21kworker/u8:3+flush-259:020:50:161
858472992825,2cyclictest864112-21kworker/u8:0+flush-259:019:50:211
858472992824,3cyclictest1181705-21kworker/u8:0+events_unbound00:30:171
858465992824,3cyclictest1019848-21kworker/u8:1+flush-259:021:50:180
858477992722,3cyclictest1040547-21latency_hist22:05:012
858472992723,3cyclictest879223-21apt-get19:30:121
858472992723,3cyclictest842726-21kworker/u8:2+events_unbound19:55:041
858472992723,3cyclictest1020062-21kworker/u8:4+events_unbound23:20:251
858472992723,2cyclictest931418-21kworker/u8:0+flush-259:020:30:231
858472992722,3cyclictest852868-21kworker/u8:3+events_unbound19:10:161
858472992722,3cyclictest1020062-21kworker/u8:4+flush-259:022:40:161
858465992723,3cyclictest957398-21apt-get20:45:120
858465992723,3cyclictest842726-21kworker/u8:2+flush-259:019:55:160
858465992721,4cyclictest252-21systemd-journal22:41:450
858480992622,3cyclictest951974-21kworker/u8:4+flush-259:020:55:233
858480992620,4cyclictest864112-21kworker/u8:0+flush-259:019:50:163
858472992623,2cyclictest899607-21kworker/u8:1+events_unbound20:15:201
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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