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2026-09-15 - 00:45

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 Sep 14, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2562639995752,3cyclictest2734976-21kworker/u8:0+flush-259:010:30:222
2562630994943,4cyclictest2766490-21latency_hist10:25:010
2562643994235,5cyclictest2708857-21latency_hist09:30:003
2562639994239,2cyclictest2862582-21kworker/u8:0+events_unbound12:05:232
2562639994239,2cyclictest2783207-21kworker/u8:0+flush-259:011:30:142
2562639994036,3cyclictest2567694-21kworker/u8:2+events_unbound07:25:212
2562639993734,2cyclictest2734976-21kworker/u8:0+flush-259:010:10:232
2562643993630,4cyclictest2588885-21/usr/sbin/munin07:35:253
2562639993632,3cyclictest2897502-21kworker/u8:4+events_unbound12:35:142
2562639993629,3cyclictest2862582-21kworker/u8:0+events_unbound12:00:172
2562634993623,4cyclictest2823848-21ntpq11:15:221
2562639993532,2cyclictest2714457-21kworker/u8:3+flush-259:009:45:242
2562639993532,2cyclictest2614280-21kworker/u8:2+flush-259:009:25:212
2562639993531,3cyclictest2887424-21kworker/u8:2+events_unbound12:30:132
2562639993531,3cyclictest2677413-21kworker/u8:0+events_unbound09:35:152
2562630993531,3cyclictest2862582-21kworker/u8:0+flush-259:012:00:240
2562630993531,3cyclictest2756451-21apt-get10:15:110
2562630993530,3cyclictest2714679-21apt-get09:35:120
2562643993430,3cyclictest2614289-21kworker/u8:4+flush-259:008:20:233
2562639993431,2cyclictest2819635-21kworker/u8:2+events_unbound11:40:202
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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