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2026-08-06 - 08:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack2slot7s.osadl.org (updated Thu Aug 06, 2026 00:43:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
47083299565,43cyclictest551050-21ssh22:20:541
470833995444,6cyclictest583477-21ssh23:15:012
470831995240,9cyclictest265-21systemd-journal21:56:050
470831995137,11cyclictest604846-21cron23:50:010
470831995134,14cyclictest1-21systemd20:00:010
470833994936,9cyclictest588240-21unixbench_multi23:21:042
470833994936,9cyclictest588240-21unixbench_multi23:21:042
470832994941,5cyclictest494839-21systemd-run20:30:021
470832994838,6cyclictest0-21swapper/123:51:011
47083299483,39cyclictest609018-21ssh23:55:521
47083299483,38cyclictest630510-21ssh00:30:531
47083399461,40cyclictest476213-21ntpq19:25:512
470831994629,3cyclictest0-21swapper/022:35:560
470833994536,6cyclictest549834-21ssh22:20:012
470833994535,6cyclictest3057970-21cups-browsed22:51:002
470831994532,11cyclictest12650irq/32-eth023:55:530
470831994520,17cyclictest151ktimers/021:10:510
47083399442,36cyclictest538714-21ssh22:00:512
47083399442,34cyclictest535680-21ssh21:55:552
470833994418,22cyclictest0-21swapper/221:45:032
47083399441,36cyclictest497268-21ntpq20:35:552
470832994436,3cyclictest0-21swapper/121:55:011
470831994434,2cyclictest0-21swapper/020:40:010
470833994335,5cyclictest568129-21cron22:50:002
47083399432,34cyclictest504725-21ntpq21:00:522
47083399431,26cyclictest480921-21mailstats19:41:022
47083399431,24cyclictest506813-21diskmemload21:43:482
47083399431,24cyclictest506813-21diskmemload21:43:482
470832994335,5cyclictest421-21dbus-daemon22:05:011
470832994318,17cyclictest3057970-21cups-browsed22:40:551
470831994337,4cyclictest421-21dbus-daemon19:20:010
470833994232,6cyclictest554608-21unixbench_multi22:26:022
470833994232,6cyclictest554608-21unixbench_multi22:26:022
470833994219,20cyclictest0-21swapper/219:50:012
47083399421,36cyclictest499920-21/usr/sbin/munin20:45:452
470831994234,5cyclictest421-21dbus-daemon23:20:010
470831994233,6cyclictest3057970-21cups-browsed19:55:010
470831994233,6cyclictest3057970-21cups-browsed19:55:010
470831994231,8cyclictest265-21systemd-journal22:21:100
470833994125,12cyclictest620207-21latency_hist00:15:022
47083399412,33cyclictest578441-21ssh23:05:502
47083399411,37cyclictest556802-21/usr/sbin/munin22:30:462
47083399411,37cyclictest556802-21/usr/sbin/munin22:30:462
47083399411,37cyclictest501755-21ntpq20:50:532
47083399411,37cyclictest485168-21ntpq19:55:502
47083399411,35cyclictest572369-21ntpq22:55:572
47083399411,35cyclictest560274-21ntpq22:36:022
47083399411,35cyclictest494210-21ntpq20:25:522
470833994112,25cyclictest483437-21ethtool19:50:482
470833994112,25cyclictest483437-21ethtool19:50:482
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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