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2026-08-27 - 17:10

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 Thu Aug 27, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3702781995146,4cyclictest3754927-21gpgv08:00:013
3702781994845,2cyclictest3692115-21kworker/u8:2+flush-259:008:00:243
3702772994642,3cyclictest3895184-21kworker/u8:1+flush-259:010:30:320
3702772994641,3cyclictest3977913-21kworker/u8:0+flush-259:011:55:260
3702781994441,2cyclictest3874307-21kworker/u8:4+events_unbound10:05:253
3702781994340,2cyclictest3999059-21apt-get11:55:013
3702772994238,3cyclictest3686308-21kworker/u8:0+flush-259:007:25:240
3702781994138,2cyclictest3728987-21kworker/u8:3+events_unbound08:15:233
3702778994034,4cyclictest3827553-21latency_hist09:10:012
3702781993937,1cyclictest3910718-21kworker/u8:2+events_unbound11:30:233
3702781993936,2cyclictest3977913-21kworker/u8:0+flush-259:011:40:233
3702772993936,2cyclictest4004624-21kworker/u8:1+events_unbound12:15:010
3702781993835,2cyclictest3692115-21kworker/u8:2+flush-259:008:55:153
3702778993835,2cyclictest3895184-21kworker/u8:1+events_unbound10:30:162
3702781993733,3cyclictest3926869-21apt-get10:45:133
3702778993734,2cyclictest3791373-21kworker/u8:1+events_unbound08:50:232
3702775993731,4cyclictest3994120-21apt-get11:50:111
3702772993729,6cyclictest3837906-21latency_hist09:20:010
3702781993633,2cyclictest3843077-21kworker/u8:3+flush-259:009:35:113
3702778993629,5cyclictest4014993-21latency_hist12:10:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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