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2026-04-30 - 22:32

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 50 highest latencies:
System rack5slot4s.osadl.org (updated Thu Apr 30, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
113934322000,2sleep375-21kworker/3:1-events11:31:093
105392521860,2sleep375-21kworker/3:1+events10:05:013
11348892740,6sleep3451irq_work/311:26:073
885516995650,5cyclictest752041-21kworker/u8:0+flush-8:009:51:060
885520995349,3cyclictest1177905-21kworker/u8:0+flush-8:012:21:041
885516995343,7cyclictest988668-21latency_hist08:55:010
885520995244,6cyclictest885357-21kworker/u8:3+flush-8:007:26:061
885520995043,5cyclictest1132426-21kworker/u8:0+flush-8:011:46:051
885520995040,7cyclictest280-21systemd-journal11:00:371
885522994940,7cyclictest962633-21cp08:30:012
885520994942,5cyclictest907937-21kworker/u8:1+flush-8:007:46:191
885520994942,5cyclictest1053787-21kworker/u8:1+flush-8:010:41:051
885520994940,6cyclictest916793-21ntpq07:41:121
10929802480,3chrt371rcuc/210:41:202
885520994737,8cyclictest1057938-21ntpq10:06:181
885516994740,6cyclictest972160-21kworker/u8:3+flush-8:009:46:070
885520994641,4cyclictest752041-21kworker/u8:0+events_unbound07:15:011
885520994641,4cyclictest752041-21kworker/u8:0+events_unbound07:15:011
885516994633,10cyclictest967924-21diskstats08:36:050
885520994538,5cyclictest280-21systemd-journal08:51:311
885520994434,7cyclictest989604-21/usr/sbin/munin09:01:151
885522994326,14cyclictest280-21systemd-journal11:04:002
885520994337,4cyclictest1132426-21kworker/u8:0+flush-8:011:51:051
885520994336,5cyclictest1098627-21kworker/u8:3+flush-8:011:06:061
885520994335,6cyclictest972160-21kworker/u8:3+flush-8:008:46:041
885520994333,8cyclictest280-21systemd-journal12:30:011
885516994335,7cyclictest1093242-21kworker/u8:2+flush-8:010:56:040
885516994335,6cyclictest1147316-21ntpq11:36:120
885516994334,7cyclictest280-21systemd-journal12:39:590
885520994237,4cyclictest1177905-21kworker/u8:0+flush-8:012:16:071
885516994232,8cyclictest962193-21apt-get08:29:590
885516994232,7cyclictest1088425-21latency_hist10:40:010
885522994132,7cyclictest280-21systemd-journal10:50:002
885516994136,3cyclictest1018935-21latency_hist09:30:010
885516994136,3cyclictest1018935-21latency_hist09:30:000
885520994030,8cyclictest280-21systemd-journal12:35:001
8843132401,8sleep30-21swapper/307:06:073
885520993932,5cyclictest907937-21kworker/u8:1+flush-8:008:11:061
885522993829,6cyclictest280-21systemd-journal09:20:002
885520993831,5cyclictest1098692-21apt-get10:51:011
885516993834,3cyclictest907937-21kworker/u8:1+events_unbound08:11:080
885516993830,6cyclictest280-21systemd-journal08:00:580
885522993717,18cyclictest1153174-21cron11:45:002
885522993717,18cyclictest1153174-21cron11:45:002
885522993715,20cyclictest280-21systemd-journal07:53:352
885516993732,4cyclictest977333-21kworker/u8:1+flush-8:009:16:180
885516993728,6cyclictest952256-21latency_hist08:20:010
885522993622,12cyclictest1049222-21aten2_r5power_p10:01:042
885520993629,5cyclictest1027921-21ntpq09:36:141
885516993629,5cyclictest1098627-21kworker/u8:3+flush-8:011:11:060
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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