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2026-04-12 - 20:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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: 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 rack4slot1s.osadl.org (updated Sun Apr 12, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3105121370,3sleep20-21swapper/209:32:062
3105121370,3sleep20-21swapper/209:32:062
1275021150,3sleep30-21swapper/310:07:163
1275021150,3sleep30-21swapper/310:07:163
188021140,3sleep30-21swapper/308:12:153
1021421130,3sleep20-21swapper/211:27:152
2440521090,3sleep30-21swapper/312:07:083
54452930,3sleep20-21swapper/211:17:022
54452930,3sleep20-21swapper/211:17:022
22072840,3chrt0-21swapper/309:41:563
22072840,3chrt0-21swapper/309:41:563
22072840,3chrt0-21swapper/309:41:563
190512620,1sleep119125-21kernelversion11:52:111
190512620,1sleep119125-21kernelversion11:52:111
148632620,4sleep30-21swapper/307:22:063
148632620,4sleep30-21swapper/307:22:063
148632620,4sleep30-21swapper/307:22:063
65732600,3sleep30-21swapper/308:26:583
65732600,3sleep30-21swapper/308:26:583
79772570,2sleep30-21swapper/308:27:193
92472490,3chrt0-21swapper/209:57:182
92472490,3chrt0-21swapper/209:57:182
92472490,3chrt0-21swapper/209:57:182
195052490,3chrt0-21swapper/010:27:070
195052490,3chrt0-21swapper/010:27:070
80712480,1sleep18081-21tail11:22:121
80712480,1sleep18081-21tail11:22:121
80712480,1sleep18081-21tail11:22:121
268492460,3chrt0-21swapper/210:47:072
268492460,3chrt0-21swapper/210:47:072
288392450,3chrt0-21swapper/110:52:091
190232430,2sleep119151-21missed_timers07:32:101
151342430,3chrt0-21swapper/011:42:080
151342430,3chrt0-21swapper/011:42:080
238202420,3sleep20-21swapper/207:45:492
238202420,3sleep20-21swapper/207:45:492
235072420,1sleep30-21swapper/312:02:213
235072420,1sleep30-21swapper/312:02:213
168112420,4chrt0-21swapper/208:52:142
168112420,4chrt0-21swapper/208:52:142
12362410,3sleep30-21swapper/312:32:053
37812400,3sleep20-21swapper/212:37:142
37812400,3sleep20-21swapper/212:37:142
28162400,4sleep02369-21/usr/sbin/munin09:42:090
28162400,4sleep02369-21/usr/sbin/munin09:42:090
23162400,2chrt0-21swapper/208:12:182
105892400,2chrt0-21swapper/210:02:132
105892400,2chrt0-21swapper/210:02:132
298132390,2sleep20-21swapper/212:22:022
298132390,2sleep20-21swapper/212:22:022
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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