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2026-09-01 - 17:23

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 Tue Sep 01, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29152224372207,87sleep00-21swapper07:07:180
295009916018,27cyclictest6794-21apt-get11:25:230
295009916013,121cyclictest31563-21apt-get07:20:200
295009916011,125cyclictest4429-21sort07:51:020
295009915814,23cyclictest30307-21munin-node07:15:040
295009915813,121cyclictest10244-21mailstats08:27:000
295009915717,26cyclictest7652-21apt-get11:31:340
295009915716,113cyclictest14051-21apt-get08:50:250
295009915715,119cyclictest10193-21head11:41:040
295009915713,119cyclictest19435-21/usr/sbin/munin09:21:380
295009915711,120cyclictest3625-21/usr/sbin/munin11:05:340
295009915622,108cyclictest17110-21ntp_states12:25:520
295009915615,117cyclictest18765-21munin-run09:20:030
295009915614,118cyclictest12658-21munin-run12:00:020
295009915612,120cyclictest23601-21cut09:45:590
295009915513,28cyclictest15117-21/usr/sbin/munin08:55:460
295009915513,117cyclictest1717-21head10:51:030
295009915417,29cyclictest2829-21diskstats11:00:350
295009915417,113cyclictest28625-21munin-run10:20:020
295009915411,22cyclictest19136-21sort12:40:050
295009915346,23cyclictest17361-21/usr/sbin/munin09:10:270
295009915320,107cyclictest30307-21munin-node07:15:110
295009915316,23cyclictest2598-21munin-run11:00:010
295009915315,116cyclictest13076-21apt-get08:45:230
295009915313,116cyclictest22199-21munin-run09:40:020
295009915311,118cyclictest3415-21grep07:45:500
29500991529,119cyclictest32047-21expr10:40:240
295009915217,113cyclictest2188-21apt07:40:010
295009915216,111cyclictest31842-21munin-run10:40:020
295009915213,26cyclictest16361-21munin-run09:05:020
295009915213,24cyclictest15271-21df_inode12:15:290
295009915213,114cyclictest8758-21sshd11:35:210
295009915119,107cyclictest19911-21apt-get09:25:250
295009915116,111cyclictest14368-21apt12:10:120
295009915112,115cyclictest16111-21/usr/sbin/munin12:20:330
295009915111,117cyclictest26219-21latency_hist10:05:040
29500991509,26cyclictest6139-21sed08:01:040
295009915019,26cyclictest13576-21apt-get12:05:180
295009915017,24cyclictest8911-21irqstats08:20:400
295009915017,111cyclictest596-21munin-run07:30:010
295009915010,25cyclictest11090-21latency_hist11:50:040
295009915010,115cyclictest31041-21munin-run10:35:010
29500991499,40cyclictest22962-21head09:41:010
295009914922,106cyclictest26320-21apt10:05:120
295009914921,28cyclictest4696-21apt-get07:55:190
295009914917,109cyclictest29470-21wc10:25:040
295009914916,108cyclictest11514-21diskstats08:35:350
295009914915,113cyclictest6629-21/usr/sbin/munin11:25:050
295009914911,115cyclictest21338-21sed09:31:030
295009914911,115cyclictest17157-21munin-plugin-st09:10:010
29500991489,117cyclictest596-21awk10:45:470
295009914817,24cyclictest24019-21diskstats09:50:330
295009914816,109cyclictest8012-21df_inode08:15:310
295009914815,107cyclictest13017-21apt-config08:45:090
295009914814,110cyclictest17585-21apt12:30:120
295009914814,106cyclictest30401-21munin-node12:00:110
295009914812,25cyclictest5212-21diskstats11:15:340
295009914811,114cyclictest27761-21grep10:11:050
295009914714,110cyclictest10607-21/usr/sbin/munin08:30:330
295009914713,110cyclictest24782-21wc09:55:220
29500991467,114cyclictest6751-21mailstats08:05:550
295009914613,30cyclictest975-21/usr/sbin/munin07:30:480
295009914612,24cyclictest4932-21unixbench_singl11:11:040
29500991459,25cyclictest7797-21modprobe08:15:010
295009914513,20cyclictest11164-21apt-get11:50:180
295009914434,22cyclictest2653-21open_inodes07:40:520
295009914317,27cyclictest29647-21df10:25:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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