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2025-12-17 - 08:44

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 792 highest latencies:
System rack4slot6s.osadl.org (updated Wed Dec 17, 2025 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
568922850,2sleep05687-21proc_pri22:30:250
156022590,2sleep01563-21missed_timers00:20:180
2663622580,2sleep026639-21mailstats21:45:260
966821110,3chrt9667-21systemctl22:45:260
1164121030,4sleep011642-21sshd22:54:550
3006221010,3sleep030078-21irqstats00:05:160
326852960,4sleep032496-21/usr/sbin/munin00:15:170
3582845,8sleep0359-21memory22:10:180
17132845,65sleep01757-21if_eth020:10:170
274172730,3sleep027420-21idleruntime23:55:150
188632730,2sleep018859-21cat23:20:270
210712695,52sleep021082-21df21:25:130
1742326919,28sleep017438-21irqstats19:05:150
18501996523,13cyclictest114-21systemd-journal23:28:560
312772643,51sleep00-21swapper00:10:140
18501996427,26cyclictest25017-21/usr/sbin/munin23:45:180
45082630,3sleep04507-21tr20:20:210
1850199639,18cyclictest19879-21/usr/sbin/munin19:15:290
1850199608,18cyclictest22787-21chrt19:25:260
1850199607,19cyclictest27471-21/usr/sbin/munin21:50:210
1850199607,19cyclictest13243-21/usr/sbin/munin20:55:160
18501996034,17cyclictest12426-21runrttasks22:55:460
18501996011,19cyclictest21198-21/usr/sbin/munin19:20:140
18501996010,17cyclictest5482-21/usr/sbin/munin00:35:210
1850199599,17cyclictest3926-21/usr/sbin/munin00:30:170
1850199599,16cyclictest10674-21/usr/sbin/munin20:45:090
1850199598,21cyclictest17414-21ntpq21:10:200
1850199596,17cyclictest4063-21/usr/sbin/munin22:25:200
18501995933,15cyclictest22749-21/usr/sbin/munin21:30:270
18501995927,21cyclictest0-21swapper20:50:120
1850199589,18cyclictest26360-21/usr/sbin/munin19:40:190
1850199589,17cyclictest15841-21/usr/sbin/munin21:05:140
1850199589,14cyclictest15906-21memory23:10:180
1850199588,17cyclictest23594-21/usr/sbin/munin21:35:210
1850199588,16cyclictest30062-21/usr/sbin/munin22:00:150
1850199587,16cyclictest2920-21/usr/sbin/munin20:15:260
18501995833,16cyclictest7566-21runrttasks20:31:490
18501995811,17cyclictest3797-21modprobe00:30:000
18501995810,14cyclictest10175-21sshd20:41:560
1850199579,17cyclictest2781-21/usr/sbin/munin22:20:260
1850199579,15cyclictest344-21/usr/sbin/munin20:05:290
1850199579,14cyclictest24075-21users23:40:290
18501995734,15cyclictest20155-21/usr/sbin/munin21:20:250
18501995733,15cyclictest29393-21/usr/sbin/munin19:50:270
18501995733,15cyclictest27687-21/usr/sbin/munin19:45:120
18501995732,15cyclictest14600-21/usr/sbin/munin21:00:120
18501995716,15cyclictest7066-21which22:35:260
1850199569,15cyclictest288-21snmpd23:16:530
1850199569,14cyclictest5517-21/usr/sbin/munin20:25:130
1850199568,17cyclictest26048-21/usr/sbin/munin23:50:280
1850199568,16cyclictest25051-21/usr/sbin/munin19:35:280
1850199568,15cyclictest8080-21/usr/sbin/munin20:35:270
1850199568,15cyclictest14623-21memory23:05:180
1850199567,17cyclictest1457-21/usr/sbin/munin22:15:240
18501995630,16cyclictest13430-21/usr/sbin/munin23:00:250
18501995610,17cyclictest30303-21cat19:55:140
18501995610,17cyclictest19605-21munin-run21:20:010
1850199559,15cyclictest23764-21cpu19:30:090
1850199559,14cyclictest25495-21users21:40:300
1850199558,30cyclictest28645-21/usr/sbin/munin00:00:160
1850199558,15cyclictest20891-21/usr/sbin/munin23:30:290
1850199558,15cyclictest18950-21/usr/sbin/munin19:10:250
1850199556,15cyclictest22173-21/usr/sbin/munin23:35:140
18501995531,15cyclictest29602-21runrttasks21:57:310
18501995528,17cyclictest8871-21runrttasks22:43:120
1850199549,17cyclictest32161-21seq20:00:480
1850199547,16cyclictest31357-21/usr/sbin/munin22:05:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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