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2026-03-29 - 10:03

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 Sun Mar 29, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
20123224352200,88sleep00-21swapper19:07:270
204549916840,107cyclictest28765-21sendmail_mailqu19:55:570
204549916818,103cyclictest19621-21apt-get22:15:350
204549916015,26cyclictest5122-21memory00:00:440
204549916012,124cyclictest22882-21grep19:20:530
204549915815,119cyclictest7050-21sort00:11:020
204549915814,26cyclictest31452-21apt-get20:16:340
204549915812,122cyclictest14771-21munin-run21:50:020
204549915739,97cyclictest6333-21/usr/sbin/munin00:06:060
204549915718,117cyclictest30342-21munin-run23:20:060
204549915717,26cyclictest18429-21apt-get22:11:550
204549915716,39cyclictest18431-21munin-run22:10:040
204549915716,115cyclictest24008-21munin-run19:30:000
204549915715,120cyclictest3248-21munin-run20:40:030
204549915715,115cyclictest30532-21apt-get23:20:260
204549915714,120cyclictest6454-21apt21:00:020
204549915710,22cyclictest8896-21dpkg00:25:130
204549915615,26cyclictest13116-21munin-run21:40:030
204549915613,118cyclictest25606-21munin-run19:40:020
204549915612,124cyclictest11453-21/usr/sbin/munin21:31:310
204549915611,40cyclictest22342-21users19:16:200
204549915520,27cyclictest27807-21apt-get23:05:190
204549915517,111cyclictest21259-21munin-node19:15:090
204549915515,116cyclictest16770-21apt-get22:00:280
204549915514,117cyclictest25747-21apt-get19:40:270
204549915419,110cyclictest11291-21munin-run21:30:050
204549915415,116cyclictest11188-21munin-run00:40:020
204549915411,118cyclictest16190-21awk21:55:550
20454991539,123cyclictest31033-21kworker/u2:623:50:180
204549915321,106cyclictest8282-21diskstats21:10:360
204549915318,105cyclictest4957-21apt-get20:50:170
204549915311,118cyclictest31385-21sed20:11:050
204549915218,26cyclictest2139-21munin-run23:45:050
204549915215,39cyclictest7506-21memory00:15:430
204549915215,22cyclictest2306-21apt-get23:45:260
204549915215,115cyclictest14937-21apt-get21:50:290
204549915215,114cyclictest28502-21apt-get23:11:350
204549915214,117cyclictest26873-21cron23:00:010
204549915211,21cyclictest26755-21apt-get19:45:210
204549915211,116cyclictest24105-21/usr/sbin/munin19:31:020
204549915211,115cyclictest1746-21/usr/sbin/munin20:30:570
204549915119,31cyclictest6579-21apt-get21:00:210
204549915118,104cyclictest22188-21apt-get22:30:200
204549915114,116cyclictest23807-21apt-get22:40:190
20454991509,40cyclictest32495-21sort23:30:410
204549915017,24cyclictest4172-21diskstats23:55:340
204549915017,113cyclictest8794-21munin-run00:25:010
204549915017,107cyclictest31492-21apt-get23:25:270
204549915014,26cyclictest8962-21/usr/sbin/munin21:15:580
204549915014,114cyclictest13236-21apt-get21:40:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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