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2026-04-13 - 08:23

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 Mon Apr 13, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1519923998581,3cyclictest1691116-21kworker/u8:0+flush-259:022:45:022
1519923994542,2cyclictest1815169-21kworker/u8:2+flush-259:023:55:212
1519926994442,1cyclictest1737262-21fwupd22:40:013
1519926994335,5cyclictest1753090-21latency_hist22:55:003
1519921994340,2cyclictest1618395-21kworker/u8:1+flush-259:020:45:211
1519916994339,2cyclictest1618395-21kworker/u8:1+events_unbound21:05:190
1519921994239,2cyclictest1815169-21kworker/u8:2+events_unbound23:55:151
1519921994239,2cyclictest1476895-21kworker/u8:1+flush-259:019:20:181
1519923994132,2cyclictest1550993-21kworker/u8:0+flush-259:019:40:202
1519926994033,4cyclictest1613404-21cp20:40:013
1519923994037,2cyclictest1841367-21apt-get00:20:012
1519923994036,3cyclictest1618395-21kworker/u8:1+flush-259:020:41:552
1519923994031,2cyclictest1691116-21kworker/u8:0+events_unbound22:00:132
1519921994037,2cyclictest1592539-21kworker/u8:0+flush-259:020:55:001
1519923993936,2cyclictest1541118-21kworker/u8:1+flush-259:019:35:012
1519921993936,2cyclictest1541118-21kworker/u8:1+flush-259:020:05:211
1519921993935,3cyclictest1550993-21kworker/u8:0+events_unbound19:55:231
1519926993832,4cyclictest1721794-21latency_hist22:25:003
1519923993834,3cyclictest1665352-21kworker/u8:3+flush-259:022:35:202
1519921993835,2cyclictest1541118-21kworker/u8:1+events_unbound20:00:241
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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