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2026-04-08 - 03:27

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 Wed Apr 08, 2026 00:59:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
287689911801150,26cyclictest29377-21fschecks_time19:25:171
287679911451125,16cyclictest29511-21irqstats19:25:220
269972509460,29sleep10-21swapper/119:20:071
283722482404,63sleep00-21swapper/019:21:250
298562980,9sleep12876899cyclictest23:15:331
145692790,6sleep12876899cyclictest22:26:361
7002740,3sleep1211ktimersoftd/119:35:001
49192740,8sleep02876799cyclictest23:57:110
115172690,3sleep0111rcuc/023:30:240
28767996511,13cyclictest6637-21sh21:11:270
318212620,5sleep031818-21sh22:10:440
28767996021,6cyclictest19548-21sed00:45:290
47622590,4sleep1201rcuc/122:50:161
2876799592,28cyclictest0-21swapper/023:51:560
263192590,2sleep126318-21ntp_kernel_pll_22:05:251
28767995826,5cyclictest4434-21ssh22:15:560
2876799581,13cyclictest3560-21ssh22:49:290
2876799581,13cyclictest3560-21ssh22:49:290
28767995624,5cyclictest17345-21ssh00:44:070
2876799562,27cyclictest0-21swapper/000:01:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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