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2026-05-03 - 17:17

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 Sun May 03, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2123696994842,4cyclictest2341286-21apt-get10:40:121
2123704994539,4cyclictest252-21systemd-journal10:55:153
2123696994033,5cyclictest2367031-21apt-get11:05:111
2123704993932,5cyclictest2268398-21latency_hist09:30:013
2123699993935,3cyclictest2123887-21kworker/u8:1+flush-259:008:50:142
2123699993833,3cyclictest252-21systemd-journal09:02:092
2123696993833,4cyclictest2123887-21kworker/u8:1+flush-259:009:40:231
2123694993733,3cyclictest2366534-21kworker/u8:3+flush-259:011:15:210
2123696993529,4cyclictest252-21systemd-journal08:57:111
2123694993531,3cyclictest2371928-21kworker/u8:0+flush-259:011:20:150
2123694993531,3cyclictest2123887-21kworker/u8:1+flush-259:007:50:230
2123696993430,3cyclictest2371928-21kworker/u8:0+events_unbound11:25:211
2123694993330,2cyclictest2371928-21kworker/u8:0+flush-259:011:15:010
2123694993329,2cyclictest2258088-21true09:19:590
2123694993228,3cyclictest2139398-21apt-get07:25:120
2123704993124,5cyclictest2288560-21ntpq09:45:203
2123696993126,4cyclictest2361863-21/usr/sbin/munin11:00:151
2123694993026,3cyclictest252-21systemd-journal08:45:000
2123699992924,3cyclictest2325848-21apt-get10:25:132
2123704992822,4cyclictest2377329-21/usr/sbin/munin11:15:203
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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