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2026-04-22 - 21:12

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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 Wed Apr 22, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
166092940,3sleep00-21swapper/010:57:060
75022700,4chrt0-21swapper/311:57:233
75022700,4chrt0-21swapper/311:57:233
291622690,3chrt0-21swapper/308:37:123
291622690,3chrt0-21swapper/308:37:123
293602670,2chrt29359-21ntp_states10:02:241
293602670,2chrt29359-21ntp_states10:02:241
293602670,2chrt29359-21ntp_states10:02:241
64102660,1chrt0-21swapper/009:02:170
64102660,1chrt0-21swapper/009:02:170
64102660,1chrt0-21swapper/009:02:170
263772650,3chrt0-21swapper/311:22:183
263772650,3chrt0-21swapper/311:22:183
263772650,3chrt0-21swapper/311:22:183
254122570,2sleep016-21ksoftirqd/011:17:280
254122570,2sleep016-21ksoftirqd/011:17:280
254122570,2sleep016-21ksoftirqd/011:17:280
54552530,3sleep15457-21grep08:57:281
54552530,3sleep15457-21grep08:57:281
244112530,2sleep124593-21gltestperf11:17:181
244112530,2sleep124593-21gltestperf11:17:181
244112530,2sleep124593-21gltestperf11:17:181
205772510,2sleep30-21swapper/312:32:203
116832510,2chrt11682-21irqstats10:42:201
116832510,2chrt11682-21irqstats10:42:201
116832510,2chrt11682-21irqstats10:42:201
56122490,3chrt0-21swapper/311:52:203
56122490,3chrt0-21swapper/311:52:203
100642480,2sleep30-21swapper/310:37:233
100642480,2sleep30-21swapper/310:37:233
100642480,2sleep30-21swapper/310:37:233
52812470,3sleep05285-21switchtime08:57:270
52812470,3sleep05285-21switchtime08:57:270
30024994622,22cyclictest16265-21ntp_kernel_pll_09:27:231
30024994622,22cyclictest16265-21ntp_kernel_pll_09:27:231
246982460,4sleep30-21swapper/311:17:193
246982460,4sleep30-21swapper/311:17:193
246982460,4sleep30-21swapper/311:17:193
326862440,2sleep00-21swapper/011:37:260
326862440,2sleep00-21swapper/011:37:260
326862440,2sleep00-21swapper/011:37:260
30024994422,20cyclictest31825-21ntp_offset08:42:241
30024994422,20cyclictest31825-21ntp_offset08:42:241
105442440,2sleep20-21swapper/212:07:152
105442440,2sleep20-21swapper/212:07:152
105442440,2sleep20-21swapper/212:07:152
30024994310,30cyclictest0-21swapper/109:54:341
30024994310,30cyclictest0-21swapper/109:54:341
3002499401,12cyclictest23750-21ntp_states09:47:221
3002499401,12cyclictest23750-21ntp_states09:47:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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