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2026-08-02 - 00:20

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 Sat Aug 01, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8359224412209,89sleep00-21swapper07:07:080
87239916820,119cyclictest15525-21apt-get11:10:240
87239916613,128cyclictest29867-21/usr/sbin/munin09:16:030
87239916417,49cyclictest29165-21munin-run09:15:030
87239916115,120cyclictest26527-21apt-get09:00:370
87239916112,124cyclictest27656-21fgrep12:20:560
87239916014,28cyclictest19166-21apt-get08:15:130
87239915918,114cyclictest21957-21apt-get11:50:190
87239915828,107cyclictest13436-21snmpd11:49:020
87239915818,116cyclictest10600-21munin-run10:40:030
87239915813,120cyclictest4925-21apt-get10:05:310
87239915719,110cyclictest4063-21apt-get10:00:220
87239915713,26cyclictest23684-21apt-get12:01:220
87239915627,21cyclictest0-21swapper08:36:000
87239915613,120cyclictest27111-21munin-run12:20:020
87239915516,28cyclictest11284-21irqstats07:26:090
8723991549,27cyclictest24995-21uname12:05:470
87239915421,104cyclictest32596-21diskstats09:35:350
87239915415,22cyclictest24698-21apt-get08:52:010
87239915415,116cyclictest20360-21/usr/sbin/munin11:40:360
87239915414,116cyclictest7922-21grep10:20:570
87239915410,30cyclictest16581-21sshd07:56:030
87239915319,29cyclictest5991-21diskstats10:10:420
87239915317,110cyclictest25833-21apt-get08:55:280
87239915314,24cyclictest20241-21munin-run11:40:020
87239915313,100cyclictest18994-21grep08:11:050
87239915312,100cyclictest3941-21munin-run10:00:020
87239915216,22cyclictest22834-21apt-get11:55:300
87239915216,112cyclictest18643-21apt11:30:010
87239915215,113cyclictest9531-21munin-node07:15:090
87239915215,109cyclictest24104-21df08:45:230
87239915214,112cyclictest13005-21apt10:55:000
8723991519,99cyclictest17568-21awk11:20:540
87239915136,19cyclictest15342-21kernelversion07:50:430
87239915129,21cyclictest31589-21munin-run09:30:030
87239915115,23cyclictest923-21/usr/sbin/munin09:40:230
87239915110,102cyclictest14792-21cstates11:05:240
87239915023,100cyclictest8822-21apt-get07:10:220
87239915020,26cyclictest14360-21apt-get07:45:180
87239915018,26cyclictest17627-21/usr/sbin/munin08:05:240
87239915017,102cyclictest16779-21apt-get08:00:210
87239915016,23cyclictest30321-21munin-run12:40:040
87239915012,113cyclictest10411-21awk07:20:470
87239915010,116cyclictest13531-21find10:55:580
87239914924,92cyclictest5972-21kworker/u2:207:30:200
87239914916,26cyclictest31691-21apt-get09:30:190
87239914914,111cyclictest22287-21munin-run08:35:030
87239914911,115cyclictest11879-21grep10:45:540
87239914910,117cyclictest9362-21grep10:30:460
8723991489,113cyclictest8300-21/usr/sbin/munin10:25:250
8723991488,99cyclictest29509-21modprobe12:35:000
87239914814,111cyclictest23869-21users08:41:070
87239914814,108cyclictest30857-21wc09:25:040
87239914812,44cyclictest20794-21apt-get08:25:190
87239914812,114cyclictest25895-21grep12:10:490
87239914812,114cyclictest17030-21apt11:20:000
87239914811,24cyclictest28292-21missed_timers12:25:470
87239914811,113cyclictest2204-21wc09:46:010
87239914810,42cyclictest12784-21systemd-journal10:16:020
8723991479,118cyclictest11136-21grep10:40:570
87239914710,49cyclictest19023-21/usr/sbin/munin11:30:470
87239914618,103cyclictest20098-21df08:20:240
87239914615,24cyclictest3069-21grep09:51:030
87239914614,111cyclictest27679-21apt-get09:05:150
87239914613,107cyclictest13928-21/usr/sbin/munin11:00:470
87239914511,39cyclictest14099-21/usr/sbin/munin07:41:040
87239914511,23cyclictest13154-21zcat07:35:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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