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2026-03-11 - 19:43

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 highest latencies:
System rack5slot7s.osadl.org (updated Wed Mar 11, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7272224342204,89sleep00-21swapper07:07:560
75509916623,30cyclictest6157-21apt-get10:15:200
75509916616,26cyclictest27821-21apt-get09:11:150
75509916615,41cyclictest4668-21df10:05:260
75509916516,122cyclictest9486-21apt-get07:22:020
75509916322,108cyclictest20822-21df_inode08:25:300
75509916132,108cyclictest3654-21munin-run10:00:020
75509916116,24cyclictest10075-21apt-get10:41:340
75509916018,111cyclictest22667-21apt-get11:55:150
75509916015,25cyclictest10075-21apt10:40:010
75509916015,122cyclictest8339-21munin-plugin-st07:15:000
75509915817,25cyclictest29660-21munin-run09:20:020
75509915816,25cyclictest23487-21/usr/sbin/munin12:01:060
75509915716,116cyclictest18911-21apt-get08:15:280
75509915714,120cyclictest29208-21apt12:35:000
75509915614,116cyclictest26618-21latency_hist12:20:070
7550991559,122cyclictest25331-21head08:51:020
75509915516,115cyclictest26576-21apt-get12:21:290
75509915515,39cyclictest24975-21munin-run12:10:010
75509915422,30cyclictest21509-21apt-get08:30:200
75509915415,25cyclictest9491-21/usr/sbin/munin07:20:070
75509915415,22cyclictest22719-21zcat08:35:560
75509915415,115cyclictest19885-21find11:35:550
75509915414,39cyclictest17709-21apt-get11:25:240
75509915413,26cyclictest22223-21/usr/sbin/munin11:50:540
75509915412,39cyclictest8449-21munin-node12:10:100
75509915312,114cyclictest27121-21/usr/sbin/munin09:05:130
75509915238,22cyclictest23323-21kernelversion08:40:420
75509915237,93cyclictest11049-21/usr/sbin/munin07:26:050
75509915217,22cyclictest13559-21ntp_states07:41:330
75509915211,117cyclictest31136-21ls09:26:010
7550991519,117cyclictest18048-21wc08:10:050
75509915122,29cyclictest12223-21apt-get07:35:220
75509915116,113cyclictest18238-21irqstats08:10:410
75509915115,110cyclictest12128-21diskstats10:50:300
75509915114,116cyclictest19303-21grep11:31:080
75509915114,115cyclictest13509-21munin-run11:00:020
75509915114,114cyclictest19925-21apt-get08:20:210
75509915113,27cyclictest17147-21sshd08:01:200
75509915113,115cyclictest7025-21cpu10:20:200
7550991509,118cyclictest8430-21grep10:26:020
75509915076,53cyclictest11229-21sshd10:45:190
75509915017,24cyclictest9238-21users10:31:040
75509915013,97cyclictest2854-21munin-run09:55:010
75509915013,112cyclictest16845-21/usr/sbin/munin11:20:350
75509915010,117cyclictest30140-21ps09:20:540
7550991498,25cyclictest27899-21irqstats12:25:460
75509914919,110cyclictest13117-21kworker/u2:107:45:120
75509914918,20cyclictest20523-21memory11:40:440
75509914910,115cyclictest5790-21snmpd07:59:200
75509914872,52cyclictest890-21grep09:40:550
75509914824,33cyclictest0-21swapper10:00:580
75509914817,23cyclictest26443-21diskstats09:00:330
75509914813,110cyclictest16012-21apt-get11:15:190
75509914812,113cyclictest32158-21/usr/sbin/munin09:35:460
75509914810,25cyclictest14220-21grep11:01:000
75509914715,104cyclictest11428-21/usr/sbin/munin07:30:220
75509914713,110cyclictest24656-21cat08:50:040
75509914713,108cyclictest29307-21/usr/sbin/munin12:35:100
75509914620,102cyclictest21075-21apt-get11:45:180
75509914617,107cyclictest0-21swapper08:55:500
75509914613,110cyclictest5887-21grep10:11:000
75509914514,30cyclictest14491-21cstates11:05:260
75509914514,108cyclictest15332-21diskstats11:10:340
75509914511,110cyclictest15437-21grep07:51:030
75509914416,22cyclictest1950-21grep09:46:030
75509914313,104cyclictest31609-21/usr/sbin/munin09:30:440
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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