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2026-05-23 - 01:45

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 Fri May 22, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
99216321860,5sleep3481ktimers/310:50:543
92262121710,3sleep375-21kworker/3:1+events09:40:573
8587092800,6chrt0-21swapper/208:36:032
7652022770,3chrt451irq_work/307:05:563
767790996054,4cyclictest844532-21kworker/u8:1+events_unbound08:30:011
767790996052,6cyclictest948812-21kworker/u8:0+flush-8:010:16:021
767792995850,6cyclictest1704890-21systemd-journal11:45:002
767785995647,6cyclictest768341-21diskstats07:10:490
767790995543,9cyclictest1704890-21systemd-journal09:35:001
767790995443,8cyclictest893078-21ntpq09:10:561
767790995441,9cyclictest1704890-21systemd-journal08:20:001
767790995345,6cyclictest859667-21/usr/sbin/munin08:41:031
767785995241,8cyclictest919238-21diskstats09:40:490
7911002510,2chrt0-21swapper/207:30:512
767790995146,3cyclictest768021-21kworker/u8:4+events_unbound07:15:591
767790995142,6cyclictest898003-21ntpq09:15:561
767785995143,5cyclictest893970-21latency_hist09:15:010
767792995043,5cyclictest1008254-21apt-get11:10:032
767790995040,8cyclictest1076730-21ntpq12:15:581
767790995038,9cyclictest823531-21ntpq08:00:571
767785995040,8cyclictest933485-21apt-get09:55:000
767790994940,7cyclictest834060-21kworker/u8:2+flush-8:010:06:021
767790994940,6cyclictest889035-21kworker/u8:3+flush-8:009:51:031
767790994939,6cyclictest889035-21kworker/u8:3+flush-8:011:46:051
767785994939,7cyclictest1047982-21latency_hist11:50:020
767785994838,8cyclictest1081779-21ntpq12:20:590
767790994742,3cyclictest768021-21kworker/u8:4+events_unbound07:20:471
9211422460,3chrt921147-21kthreadcore09:40:541
767790994641,4cyclictest768021-21kworker/u8:4+flush-8:007:31:001
767790994639,5cyclictest889035-21kworker/u8:3+flush-8:010:51:021
767785994636,8cyclictest1042167-21ntpq11:40:570
767785994635,8cyclictest902928-21ntpq09:20:560
767792994534,8cyclictest854563-21cat08:35:012
767785994541,3cyclictest1058077-21kworker/u8:0+events_unbound12:06:040
767785994540,3cyclictest714507-21kworker/u8:0+flush-8:007:20:000
767792994438,4cyclictest834060-21kworker/u8:2+flush-8:011:05:002
767790994337,4cyclictest768021-21kworker/u8:4+flush-8:008:11:041
767785994339,3cyclictest973770-21kworker/u8:0+events_unbound10:40:530
767785994236,4cyclictest1082917-21apt-get12:25:420
767785994233,6cyclictest809378-21latency_hist07:50:000
767790994134,5cyclictest834060-21kworker/u8:2+flush-8:011:05:581
767790994131,6cyclictest1704890-21systemd-journal11:32:401
767790994129,9cyclictest788687-21ntpq07:25:581
767785994133,6cyclictest1072678-21munin-run12:14:590
767785994131,8cyclictest927666-21ntpq09:45:570
767790994035,3cyclictest768021-21kworker/u8:4+flush-8:007:40:511
767790994034,4cyclictest834060-21kworker/u8:2+flush-8:008:51:001
767790994034,4cyclictest1704890-21systemd-journal12:34:371
767790994034,4cyclictest1092764-21apt-get12:35:441
767790994033,5cyclictest4117833-21kworker/u8:2+events_unbound07:55:581
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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