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2026-05-17 - 16:40

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 17, 2026 12:44:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
787898993731,4cyclictest922943-21apt-get09:20:111
787894993734,2cyclictest871026-21kworker/u8:2+flush-259:008:30:240
787902993629,5cyclictest1094375-21latency_hist12:05:012
787902993430,3cyclictest1016256-21kworker/u8:1+flush-259:011:10:272
787902993328,3cyclictest938177-21latency_hist09:35:002
787904993225,5cyclictest953661-21latency_hist09:50:003
787902993127,3cyclictest1068230-21gpgv11:39:592
787894993126,4cyclictest1042257-21cp11:15:020
787894992926,2cyclictest1016501-21apt-get10:50:100
787898992824,3cyclictest839802-21apt-get08:00:161
787898992723,3cyclictest1079136-21apt-get11:50:111
787904992516,6cyclictest875332-21ntpq08:30:213
787902992521,3cyclictest881688-21kworker/u8:5+flush-259:009:15:172
787894992519,4cyclictest1078868-21latency_hist11:50:000
787904992419,4cyclictest943601-21apt-get09:40:143
787898992418,4cyclictest886604-21latency_hist08:45:021
787904992316,4cyclictest974142-21apt-get10:10:003
78790299239,6cyclictest876235-21munin-run08:35:012
787904992217,4cyclictest990045-21kworker/u8:2+flush-259:011:00:173
787894992217,3cyclictest252-21systemd-journal11:10:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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