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2025-12-18 - 02:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack3slot6s.osadl.org (updated Thu Dec 18, 2025 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31893211793,18sleep10-21swapper/119:06:531
31823211598,12sleep30-21swapper/319:05:583
31468211287,18sleep20-21swapper/219:05:202
32022210897,6sleep00-21swapper/019:08:320
268272760,0sleep20-21swapper/222:00:232
230582730,0sleep30-21swapper/300:31:143
144422670,0sleep20-21swapper/200:20:312
272232530,0sleep10-21swapper/123:19:421
32166994019,3cyclictest16059-21diskmemload21:20:123
32166993010,18cyclictest0-21swapper/300:00:123
118082240,0sleep00-21swapper/000:18:340
3216499233,2cyclictest23-21ksoftirqd/120:35:121
154692220,1sleep315470-21cpu23:05:123
3216699211,2cyclictest0-21swapper/322:00:123
32164992118,2cyclictest0-21swapper/122:20:111
24642210,1sleep30-21swapper/323:28:303
3216599200,2cyclictest0-21swapper/219:35:112
3216499202,13cyclictest0-21swapper/121:37:051
32164992017,2cyclictest0-21swapper/123:25:111
3216499201,2cyclictest0-21swapper/122:00:121
3216699190,2cyclictest0-21swapper/319:45:103
3216499194,2cyclictest0-21swapper/100:33:051
114352190,1sleep20-21swapper/220:55:252
3216499173,2cyclictest0-21swapper/122:11:041
3216499171,14cyclictest12003-21apt-get23:40:111
3216499170,12cyclictest0-21swapper/123:47:041
32163991714,2cyclictest101ktimersoftd/021:38:040
3216399171,3cyclictest0-21swapper/021:10:130
3216399170,15cyclictest0-21swapper/022:55:100
32165991613,2cyclictest370-21kworker/u8:100:06:042
32165991613,2cyclictest28455-21kworker/u8:220:33:042
32165991613,2cyclictest15359-21kworker/u8:223:08:042
3216499162,2cyclictest0-21swapper/123:53:051
32164991613,2cyclictest4155-21kworker/u8:020:54:051
32164991613,2cyclictest28455-21kworker/u8:220:56:051
32164991613,2cyclictest28455-21kworker/u8:220:34:051
32164991613,2cyclictest23193-21kworker/u8:021:56:041
32164991613,2cyclictest18348-21kworker/u8:020:08:051
32164991613,2cyclictest12492-21kworker/u8:100:25:041
3216499161,2cyclictest0-21swapper/123:58:041
3216399161,13cyclictest101ktimersoftd/022:52:570
3216399161,13cyclictest101ktimersoftd/022:25:140
3216699151,3cyclictest32719-21ssh21:29:593
3216699150,2cyclictest0-21swapper/323:50:083
3216699150,2cyclictest0-21swapper/300:12:353
3216699150,13cyclictest2641-21munin-node3
3216699150,13cyclictest25241-21seq22:37:413
3216699150,13cyclictest16693-21fschecks_time23:45:133
3216699150,13cyclictest16059-21diskmemload23:12:163
3216699150,13cyclictest0-21swapper/300:24:353
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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