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2026-08-15 - 12:42

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 Sat Aug 15, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3589489995548,3cyclictest3793404-21kworker/u8:3+flush-259:023:00:013
3589489995249,2cyclictest3720207-21kworker/u8:3+events_unbound21:20:143
3589474995047,2cyclictest3741683-21kworker/u8:0+flush-259:021:40:010
3589484994742,3cyclictest3845021-21kworker/u8:0+flush-259:023:55:212
3589474994744,2cyclictest3892116-21kworker/u8:1+flush-259:000:05:240
3589474994743,3cyclictest3793404-21kworker/u8:3+flush-259:022:35:010
3589484994542,2cyclictest3720207-21kworker/u8:3+events_unbound21:40:242
3589489994441,2cyclictest3705085-21kworker/u8:2+flush-259:021:05:213
3589489994440,3cyclictest3772688-21kworker/u8:1+flush-259:022:30:013
3589484994441,2cyclictest3772688-21kworker/u8:1+events_unbound22:20:142
3589474994439,1cyclictest3741683-21kworker/u8:0+events_unbound21:50:000
3589489994239,2cyclictest3861162-21kworker/u8:1+events_unbound23:35:233
3589484994238,3cyclictest587552-21kworker/u8:4+flush-259:019:10:292
3589489994138,2cyclictest3720207-21kworker/u8:3+events_unbound21:40:213
3589474994138,2cyclictest3908172-21kworker/u8:3+events_unbound00:30:140
3589474994138,2cyclictest3772688-21kworker/u8:1+events_unbound22:40:140
3589474994138,2cyclictest2882661-21kworker/u8:3+events_unbound19:15:240
3589489994035,4cyclictest3871499-21/usr/sbin/munin23:40:143
3589484994037,2cyclictest3861162-21kworker/u8:1+flush-259:023:40:212
3589478993933,4cyclictest335557-21systemd-journal22:40:401
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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