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2025-12-18 - 16:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 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 rackcslot7s.osadl.org (updated Thu Dec 18, 2025 12:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
34025612990,7sleep04497-21PK-Backend11:45:150
197399790,68rtkit-daemon0-21swapper/007:07:370
33058212760,4sleep30-21swapper/307:10:173
330492927350,15sleep30-21swapper/307:10:013
330491927354,14sleep10-21swapper/107:09:541
197399680,9rtkit-daemon1972-21rtkit-daemon11:58:420
197399670,9rtkit-daemon1972-21rtkit-daemon09:36:590
197399660,8rtkit-daemon1972-21rtkit-daemon10:18:110
330428226442,15sleep20-21swapper/207:05:212
330507199632,34cyclictest3386040-40lsb_release10:56:062
33621352620,17sleep013-21ksoftirqd/009:50:130
197399590,9rtkit-daemon1972-21rtkit-daemon10:02:250
197399590,9rtkit-daemon1972-21rtkit-daemon08:18:300
197399590,7rtkit-daemon1972-21rtkit-daemon12:32:270
330507199582,27cyclictest3345693-21munin-run09:05:012
197399580,9rtkit-daemon1972-21rtkit-daemon11:27:210
197399580,9rtkit-daemon1972-21rtkit-daemon09:59:150
197399580,9rtkit-daemon1972-21rtkit-daemon09:59:150
197399570,9rtkit-daemon1972-21rtkit-daemon12:11:350
197399570,9rtkit-daemon1972-21rtkit-daemon11:51:040
197399570,9rtkit-daemon1972-21rtkit-daemon10:28:370
197399570,9rtkit-daemon1972-21rtkit-daemon09:44:460
197399570,9rtkit-daemon1972-21rtkit-daemon07:56:160
197399570,8rtkit-daemon1972-21rtkit-daemon09:32:410
197399570,8rtkit-daemon1972-21rtkit-daemon08:08:320
197399570,8rtkit-daemon1972-21rtkit-daemon07:21:160
197399560,9rtkit-daemon1972-21rtkit-daemon12:06:400
197399560,9rtkit-daemon1972-21rtkit-daemon12:01:510
197399560,9rtkit-daemon1972-21rtkit-daemon09:47:140
197399560,9rtkit-daemon1972-21rtkit-daemon09:28:060
197399560,9rtkit-daemon1972-21rtkit-daemon09:21:170
197399560,9rtkit-daemon1972-21rtkit-daemon09:07:570
197399560,9rtkit-daemon1972-21rtkit-daemon08:30:510
197399560,9rtkit-daemon1972-21rtkit-daemon07:52:200
197399560,9rtkit-daemon1972-21rtkit-daemon07:52:200
197399560,8rtkit-daemon1972-21rtkit-daemon12:37:110
197399560,8rtkit-daemon1972-21rtkit-daemon08:42:340
197399560,8rtkit-daemon1972-21rtkit-daemon07:42:380
197399560,8rtkit-daemon1972-21rtkit-daemon07:33:500
3305071995520,29cyclictest438-20systemd-journal10:24:102
3305071995520,29cyclictest438-20systemd-journal10:24:102
3305070995521,7cyclictest3380896-21perf10:45:001
3305070995519,8cyclictest3319727-21ls07:50:141
3305070995519,8cyclictest3319727-21ls07:50:131
197399550,9rtkit-daemon1972-21rtkit-daemon10:15:381
197399550,8rtkit-daemon1972-21rtkit-daemon11:40:040
197399550,8rtkit-daemon1972-21rtkit-daemon11:39:230
197399550,8rtkit-daemon1972-21rtkit-daemon10:10:050
197399550,8rtkit-daemon1972-21rtkit-daemon09:16:410
197399550,8rtkit-daemon1972-21rtkit-daemon09:11:420
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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