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2025-12-07 - 22:49

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 20 highest latencies:
System rackeslot4s.osadl.org (updated Sun Dec 07, 2025 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1485994994336,5cyclictest1600044-21latency_hist09:00:012
1485989993832,4cyclictest1693454-21/usr/sbin/munin10:30:141
1485994993629,4cyclictest1698383-21latency_hist10:35:012
1485983993430,3cyclictest1687683-21kworker/u8:2+flush-259:010:50:000
1485994993225,5cyclictest1532539-21latency_hist07:55:012
1485983993227,3cyclictest1558521-21kworker/u8:2+flush-259:009:05:010
1485994993127,3cyclictest1579161-21kworker/u8:1+flush-259:009:19:592
1485983993126,3cyclictest1512202-21/usr/sbin/munin07:35:150
1485983993126,3cyclictest1512202-21/usr/sbin/munin07:35:150
1485994992922,5cyclictest1568588-21latency_hist08:30:012
1485983992925,3cyclictest1823020-21kworker/u8:1+events_unbound12:35:140
1485983992925,3cyclictest1687683-21kworker/u8:2+flush-259:010:45:000
1486000992823,4cyclictest1635193-21ntpq09:30:233
1485983992824,3cyclictest1620856-21kworker/u8:4+events_unbound10:00:230
1486000992724,2cyclictest1522264-21kworker/u8:1+events_unbound07:55:193
1485994992721,4cyclictest1626244-21diskstats09:25:152
1485983992723,3cyclictest1760979-21kworker/u8:0+flush-259:011:40:220
148598399271,24cyclictest1822810-21true12:35:010
1485994992623,2cyclictest1770166-21kworker/u8:3+flush-259:012:05:012
1485994992619,5cyclictest1786693-21latency_hist12:00:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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