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2026-05-22 - 13:43

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack5slot4s.osadl.org (updated Fri May 22, 2026 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
316191121870,3sleep375-21kworker/3:1+events22:40:013
30298952720,1chrt3029900-21kthreadcore20:25:531
31014152710,3sleep2371rcuc/221:36:042
30812802640,1sleep13081281-21missed_timers21:15:561
31140602550,2sleep375-21kworker/3:1-events21:50:533
2951386995543,8cyclictest1704890-21systemd-journal20:55:411
2951386995341,9cyclictest3195636-21ntpq23:11:001
2951388995243,6cyclictest1704890-21systemd-journal21:30:012
30039002510,6sleep20-21swapper/220:00:542
2951383995140,9cyclictest2955370-21ntpq19:11:020
2951386995044,4cyclictest3056642-21kworker/u8:0+flush-8:022:05:471
2951383995044,4cyclictest3191850-21apt-get23:10:440
2951388994938,8cyclictest1704890-21systemd-journal00:09:592
2951386994837,8cyclictest1704890-21systemd-journal19:15:411
2951386994738,6cyclictest3241533-21kworker/u8:2+flush-8:000:35:501
2951386994736,8cyclictest1704890-21systemd-journal21:34:411
2951383994738,7cyclictest3170907-21ntpq22:45:570
2951386994640,4cyclictest3142169-21apt-get22:20:451
2951386994639,5cyclictest3112237-21/usr/sbin/munin21:50:561
2951386994535,8cyclictest3150917-21ntpq22:25:581
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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