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2026-05-07 - 05:46

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 50 highest latencies:
System rack5slot7s.osadl.org (updated Thu May 07, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
19742224472216,88sleep00-21swapper19:06:110
202149917018,64cyclictest21021-21munin-node19:15:140
202149916115,25cyclictest31243-21/usr/sbin/munin23:35:520
202149916114,23cyclictest3134-21apt-get20:45:160
202149916046,94cyclictest11718-21processes21:35:540
202149916017,118cyclictest2150-21munin-run20:40:030
202149916014,29cyclictest21275-21users19:15:260
202149915917,101cyclictest18660-21apt22:20:010
202149915914,121cyclictest828-21uname20:30:400
202149915840,97cyclictest11049-21threads21:30:580
202149915817,117cyclictest27587-21diskstats19:55:330
202149915718,25cyclictest5018-21irqstats00:11:100
202149915717,26cyclictest7294-21apt-get21:10:190
202149915715,38cyclictest16827-21apt-get22:10:030
202149915616,114cyclictest1436-21apt-get23:50:270
202149915615,117cyclictest3541-21cut00:00:590
202149915612,119cyclictest4397-21sort00:05:590
202149915511,117cyclictest19582-21timerandwakeup22:22:030
202149915417,115cyclictest28740-21munin-run23:20:020
202149915412,36cyclictest29093-21apt-get20:05:200
202149915412,115cyclictest27991-21wc23:15:050
202149915379,51cyclictest9421-21ls00:35:580
202149915318,111cyclictest707-21df23:45:400
202149915318,111cyclictest21057-21memory22:30:500
202149915317,114cyclictest8849-21wc21:20:050
202149915313,117cyclictest5846-21uname00:15:470
202149915311,41cyclictest13293-21proc_pri21:45:530
202149915310,100cyclictest3042-21grep20:45:080
20214991529,121cyclictest12784-21systemd-journal19:22:220
202149915222,27cyclictest24025-21apt-get22:50:200
202149915221,106cyclictest16827-21apt-get22:11:170
202149915218,106cyclictest30451-21apt-get23:30:210
202149915213,26cyclictest20267-21missed_timers22:26:320
202149915213,116cyclictest12555-21find21:40:550
202149915210,118cyclictest30380-21cut20:10:580
202149915131,98cyclictest0-21swapper22:35:460
202149915127,31cyclictest0-21swapper00:30:040
202149915116,115cyclictest29554-21munin-run23:25:000
202149915116,110cyclictest24924-21df_inode22:55:290
202149915114,111cyclictest4089-21apt-get20:50:270
202149915111,116cyclictest28369-21cstates20:00:220
202149915019,106cyclictest14037-21ntp_states21:50:510
202149915014,23cyclictest15439-21df22:00:270
202149915013,38cyclictest31515-21/usr/sbin/munin20:20:580
202149915010,101cyclictest26309-21grep19:45:580
202149914919,103cyclictest8921-21apt-get21:20:170
202149914916,25cyclictest6602-21df_inode21:05:290
202149914913,25cyclictest24319-21awk19:35:210
202149914912,25cyclictest23469-21/usr/sbin/munin19:30:240
202149914912,112cyclictest23228-21/usr/sbin/munin22:45:320
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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