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2026-03-20 - 18:03

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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.

Total number of samples: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack4slot6s.osadl.org (updated Fri Mar 20, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2612422060,2sleep026122-21ls11:00:020
2666521210,4chrt26664-21/usr/sbin/munin08:55:220
2026021190,2sleep020259-21pluginstate08:30:240
2792821180,2sleep027930-21awk11:05:240
176021130,4sleep01779-21/usr/sbin/munin09:25:140
1399721130,3chrt13998-21timerandwakeup08:05:270
312392990,4sleep031284-21sendmail-msp11:20:020
73722950,3sleep07437-21/usr/sbin/munin07:40:250
124652910,2sleep012463-21ntpq08:00:200
217062870,3sleep021775-21/usr/sbin/munin08:35:270
95622840,3sleep09578-21latency09:55:170
31629998048,21cyclictest23804-21/usr/sbin/munin08:45:170
31629997951,16cyclictest10908-21processes12:05:210
32742780,3sleep03291-21open_files09:30:230
19332770,3sleep01951-21/usr/sbin/munin07:20:130
31629997649,15cyclictest4670-21expr09:35:250
31629997548,16cyclictest6837-21seq07:39:450
31629997545,19cyclictest26222-21/usr/sbin/munin11:00:090
31629997451,14cyclictest4198-21runrttasks07:29:090
31629997348,15cyclictest18249-21cat12:35:010
31629997343,19cyclictest22615-21/usr/sbin/munin10:45:190
31629997341,17cyclictest414-21memory11:25:190
3051227319,29sleep030568-21irqstats07:05:150
31629997247,14cyclictest18744-21apt-get12:35:290
31629997245,16cyclictest32553-21runrttasks07:12:200
31629997241,19cyclictest4105-21/usr/sbin/munin11:40:170
31629997047,13cyclictest8598-21ntp_states07:45:210
31629997046,14cyclictest6734-21df_inode11:50:130
31629997044,16cyclictest14520-21forks12:20:140
31629997044,15cyclictest24351-21seq10:51:250
31629997044,15cyclictest22308-21date10:45:020
31629997044,15cyclictest19731-21date10:35:010
31629997043,15cyclictest8136-21/usr/sbin/munin09:50:090
31629997040,20cyclictest2844-21/usr/sbin/munin11:35:120
31629997038,19cyclictest1813-21runrttasks11:30:230
31629997035,22cyclictest25090-21/usr/sbin/munin08:50:120
31629996947,13cyclictest30190-21date09:10:010
31629996946,12cyclictest9549-21/usr/sbin/munin12:00:210
31629996945,15cyclictest23560-21seq08:44:050
31629996945,14cyclictest699-21ntp_states09:20:210
31629996944,15cyclictest32537-21seq09:18:330
31629996944,15cyclictest12321-21ntp_states10:05:250
31629996943,15cyclictest5696-21latency_hist07:35:010
31629996943,15cyclictest31695-21ntp_states11:20:210
31629996844,13cyclictest28290-21chrt09:00:300
31629996844,13cyclictest14009-21chrt10:11:170
31629996843,15cyclictest19729-21latency_hist10:35:010
31629996843,15cyclictest11577-21runrttasks10:02:250
31629996843,14cyclictest7320-21mailstats09:45:260
31629996837,18cyclictest16093-21memory10:20:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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