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2026-04-10 - 08:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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.

Total number of samples: 50.5 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 792 highest latencies:
System rack5slot7s.osadl.org (updated Fri Apr 10, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6071224382202,89sleep00-21swapper19:07:200
64139916216,42cyclictest29917-21apt-get21:30:310
64139916122,30cyclictest32611-21diskstats21:45:360
64139916112,41cyclictest7963-21munin-run22:35:020
64139916021,110cyclictest26511-21diskstats21:10:350
64139916020,26cyclictest27787-21apt-get00:35:150
64139916011,103cyclictest24351-21wc20:55:550
64139915817,24cyclictest7961-21apt-get22:36:130
64139915813,104cyclictest28131-21modprobe21:20:010
64139915737,97cyclictest21566-21latency_hist20:40:060
64139915713,123cyclictest23877-21/usr/sbin/munin00:10:240
64139915642,23cyclictest3123-21vmstat22:01:090
64139915616,115cyclictest7204-21/usr/sbin/munin19:15:060
6413991559,103cyclictest8502-21apt-get19:20:170
64139915539,23cyclictest31336-21mailstats21:36:040
64139915526,34cyclictest0-21swapper22:20:040
64139915521,108cyclictest19979-21apt-get20:30:220
64139915512,21cyclictest15081-21grep23:15:560
6413991549,120cyclictest28623-21grep21:21:030
64139915444,21cyclictest4386-21open_inodes22:10:520
64139915439,94cyclictest11611-21switchtime19:35:590
64139915427,22cyclictest0-21swapper00:20:480
64139915414,25cyclictest21035-21munin-run23:55:040
64139915411,30cyclictest9732-21head22:41:100
64139915411,116cyclictest21868-21/usr/sbin/munin23:57:010
64139915319,108cyclictest12157-21users22:56:050
64139915315,29cyclictest7315-21munin-node19:45:120
64139915312,115cyclictest22186-21/usr/sbin/munin00:00:510
6413991529,119cyclictest272-21snmpd20:48:140
64139915220,107cyclictest7641-21apt-get19:15:390
64139915215,98cyclictest17133-21apt-get23:30:140
64139915214,115cyclictest7164-21apt22:30:000
64139915213,114cyclictest3502-21missed_timers22:05:460
64139915139,90cyclictest31892-21kernelversion21:40:410
64139915112,26cyclictest23050-21wc00:05:230
6413991509,40cyclictest26358-21grep21:10:050
6413991509,119cyclictest12752-21wc23:00:550
64139915079,50cyclictest15050-21munin-run20:00:020
64139915022,100cyclictest24804-21apt-get21:00:210
64139915019,103cyclictest26198-21apt-get00:25:170
64139915017,20cyclictest0-21swapper19:35:010
64139915015,24cyclictest21708-21diskstats20:40:290
64139915015,22cyclictest16829-21wc20:10:210
64139915014,112cyclictest23292-21df_inode20:50:280
64139915013,25cyclictest10283-21wc19:30:060
6413991499,117cyclictest12452-21/usr/sbin/munin19:40:580
6413991498,119cyclictest19923-21cat20:30:040
64139914915,35cyclictest1530-21munin-run21:55:010
64139914911,96cyclictest14330-21ls19:55:050
6413991489,25cyclictest17019-21modprobe23:30:010
64139914873,37cyclictest16639-21sshd20:07:110
64139914833,23cyclictest16103-21timerandwakeup23:21:000
64139914820,26cyclictest13916-21apt-get23:10:220
64139914815,24cyclictest2337-21munin-run22:00:010
64139914815,22cyclictest25283-21munin-run00:20:020
64139914812,97cyclictest11000-21ntpq22:50:480
64139914732,22cyclictest18037-21mailstats20:15:580
64139914729,23cyclictest13540-21zcat23:05:560
64139914710,23cyclictest27679-21modprobe00:35:010
64139914643,81cyclictest18246-21/usr/sbin/munin23:35:510
64139914614,23cyclictest29123-21seq21:25:230
64139914613,19cyclictest19347-21sort23:41:030
64139914515,106cyclictest15283-21diskstats20:00:350
64139914513,20cyclictest18387-21/usr/sbin/munin20:20:550
64139914512,107cyclictest6088-21rt-features22:20:580
64139914318,23cyclictest19652-21df_inode23:45:280
64139914317,25cyclictest10019-21df_inode22:45:310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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