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2025-11-03 - 11:46

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #4

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack9slot4s (updated Mon Nov 03, 2025 00:59:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
20019911791129,30cyclictest1942-21latency_hist19:25:011
20019911591131,25cyclictest3964-21latency_hist19:30:011
20009911311099,21cyclictest0-21swapper/019:25:070
15272563516,31sleep00-21swapper/019:20:470
292432920,9sleep1200199cyclictest20:35:111
121292840,4sleep00-21swapper/022:51:590
54702820,5sleep05464-21ssh22:45:190
311142820,4sleep03-21ksoftirqd/021:30:430
215222710,3sleep121523-21cpuspeed_turbos21:55:151
167682660,5sleep041ktimersoftd/000:37:330
190162650,4sleep0111rcuc/021:52:050
47542620,22sleep03-21ksoftirqd/000:25:190
71352580,8sleep1200199cyclictest19:35:181
165212540,9sleep0200099cyclictest22:56:210
254352520,2sleep125434-21wc23:05:331
107252510,8sleep0200099cyclictest19:45:170
296422430,7sleep1200199cyclictest21:30:141
52262420,5sleep0111rcuc/020:55:240
115752420,5sleep041ktimersoftd/022:18:140
63892411,6sleep130944-21snmpd00:26:301
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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