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2025-06-24 - 19:14

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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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 20 highest latencies:
System rack4slot1s.osadl.org (updated Tue Jun 24, 2025 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
544321330,3sleep10-21swapper/108:36:301
544321330,3sleep10-21swapper/108:36:301
91942970,2sleep19193-21sed08:46:311
273312790,3sleep30-21swapper/312:26:223
273312790,3sleep30-21swapper/312:26:223
102952790,3chrt0-21swapper/311:41:283
102952790,3chrt0-21swapper/311:41:283
305852770,3sleep20-21swapper/208:16:332
305852770,3sleep20-21swapper/208:16:332
204132680,4chrt0-21swapper/307:51:263
204132680,4chrt0-21swapper/307:51:263
225062620,2sleep20-21swapper/212:11:382
225062620,2sleep20-21swapper/212:11:382
163742620,3sleep20-21swapper/209:06:262
163742620,3sleep20-21swapper/209:06:262
78502600,2sleep17961-21timerandwakeup08:41:381
71542580,1sleep3431rcuc/311:31:353
71542580,1sleep3431rcuc/311:31:353
99732570,1sleep10-21swapper/111:41:141
99732570,1sleep10-21swapper/111:41:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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