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2026-06-13 - 00:28

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 20 highest latencies:
System rackeslot4s.osadl.org (updated Fri Jun 12, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
282853995854,3cyclictest330014-21kworker/u8:4+flush-259:008:00:253
282843995145,4cyclictest340363-21base6408:05:010
282845994538,5cyclictest459813-21latency_hist10:00:011
282843994437,5cyclictest474901-21ntpq10:10:200
282853994336,5cyclictest594821-21ntpq12:05:213
282848994339,3cyclictest429164-21kworker/u8:4+flush-259:009:50:182
282843994238,3cyclictest350949-21gpgv08:15:010
282843994236,4cyclictest469275-21ntpq10:05:220
282845994136,4cyclictest351582-21/usr/sbin/munin08:15:141
282848993933,4cyclictest574326-21cat11:50:012
282853993835,2cyclictest366881-21kworker/u8:2+flush-259:008:35:003
282848993834,3cyclictest429164-21kworker/u8:4+flush-259:009:45:162
282845993831,5cyclictest422883-21ntpq09:20:221
282853993734,2cyclictest507347-21kworker/u8:1+flush-259:011:25:143
282853993531,3cyclictest522491-21kworker/u8:4+flush-259:011:10:163
282853993531,3cyclictest429164-21kworker/u8:4+flush-259:010:00:163
282843993530,4cyclictest360838-21ntpq08:20:210
282853993427,5cyclictest511835-21dpkg10:49:283
282848993430,3cyclictest424010-21/usr/sbin/munin09:25:242
282845993429,3cyclictest324445-21store07:50:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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