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2026-07-22 - 03:54

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 Wed Jul 22, 2026 00:44:20)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1805021030,3chrt0-21swapper/322:18:483
1805021030,3chrt0-21swapper/322:18:483
11222780,3sleep01124-21idleruntime20:08:410
11222780,3sleep01124-21idleruntime20:08:410
11222780,3sleep01124-21idleruntime20:08:410
22542660,3sleep30-21swapper/323:03:473
22542660,3sleep30-21swapper/323:03:473
261252610,2sleep00-21swapper/019:48:440
179182590,3sleep20-21swapper/222:18:472
179182590,3sleep20-21swapper/222:18:472
268662550,2chrt281ktimers/119:48:521
93392500,2chrt9340-21timerandwakeup20:28:521
93392500,2chrt9340-21timerandwakeup20:28:521
1296799471,33cyclictest20857-21chrt20:59:380
1296799471,33cyclictest20857-21chrt20:59:380
1296799471,33cyclictest20857-21chrt20:59:380
1296799471,33cyclictest19671-21chrt19:30:460
1296799471,33cyclictest19671-21chrt19:30:460
1296799471,32cyclictest18068-21taskset23:46:450
1296799471,32cyclictest18068-21taskset23:46:450
1296799471,31cyclictest23780-21taskset00:03:260
1296799471,31cyclictest23780-21taskset00:03:260
1296799470,33cyclictest16625-21taskset22:15:040
1296799470,33cyclictest16625-21taskset22:15:040
1296799470,33cyclictest16625-21taskset22:15:040
1296799470,32cyclictest8671-21chrt23:22:010
1296799470,32cyclictest8671-21chrt23:22:010
1296799470,30cyclictest15476-21taskset20:47:180
1296799470,30cyclictest15476-21taskset20:47:180
1296799461,32cyclictest30988-21taskset20:02:220
1296799461,32cyclictest30988-21taskset20:02:220
1296799461,31cyclictest749-21runrttasks19:57:590
1296799461,31cyclictest749-21runrttasks19:57:590
1296799461,30cyclictest11537-21chrt20:35:140
1296799461,30cyclictest11537-21chrt20:35:140
1296799461,29cyclictest31043-21chrt00:20:300
1296799461,29cyclictest31043-21chrt00:20:300
1296799461,29cyclictest31043-21chrt00:20:300
1296799461,27cyclictest1763-21chrt21:37:130
1296799461,27cyclictest1763-21chrt21:37:130
1296799461,27cyclictest1763-21chrt21:37:130
1296799460,32cyclictest14733-21chrt22:09:410
1296799460,32cyclictest14733-21chrt22:09:410
1296799460,32cyclictest14733-21chrt22:09:410
1296799460,31cyclictest12999-21taskset22:06:400
1296799460,31cyclictest12999-21taskset22:06:400
1296799460,31cyclictest12999-21taskset22:06:400
77972450,3sleep30-21swapper/323:18:463
77972450,3sleep30-21swapper/323:18:463
1296899453,33cyclictest23898-21cat00:03:321
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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