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2026-08-25 - 16:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 50 highest latencies:
System rack5slot3s.osadl.org (updated Tue Aug 25, 2026 12:44:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13502238162,24sleep30-21swapper/307:06:303
13692237163,23sleep20-21swapper/207:06:452
12802203165,25sleep10-21swapper/107:05:371
14542202167,24sleep00-21swapper/007:07:530
1020621640,3sleep2173599cyclictest11:05:242
491521410,3sleep1172999cyclictest09:40:241
1578921330,4sleep3174199cyclictest11:20:143
172199629,13cyclictest8014-21munin-run09:50:020
266062470,1sleep20-21swapper/208:05:002
172199445,12cyclictest9598-21munin-run08:40:010
172199368,13cyclictest28776-21munin-run08:10:010
172199367,14cyclictest18395-21munin-run09:00:010
172199358,12cyclictest12050irq/123-ahci[0007:30:020
172199334,14cyclictest720-21munin-run08:20:000
173599321,23cyclictest0-21swapper/211:38:332
173599321,22cyclictest22792-21diskmemload12:32:142
173599321,18cyclictest0-21swapper/208:32:222
172999322,25cyclictest17111-21ls10:10:131
1721993210,10cyclictest1410-21perf09:35:010
1721993210,10cyclictest1410-21perf09:35:010
173599311,17cyclictest0-21swapper/211:15:052
173599311,12cyclictest0-21swapper/212:00:082
172199316,12cyclictest24991-21munin-run09:15:010
173599303,11cyclictest8011-21grep07:20:192
173599301,2cyclictest0-21swapper/210:55:532
173599301,17cyclictest0-21swapper/211:31:172
173599301,13cyclictest0-21swapper/208:18:202
173599301,11cyclictest0-21swapper/212:14:382
173599301,11cyclictest0-21swapper/209:05:472
173599301,10cyclictest0-21swapper/207:30:272
173599300,20cyclictest0-21swapper/212:20:062
172999301,17cyclictest26782-21df11:45:131
172199307,11cyclictest3634-21perf09:40:010
173599292,4cyclictest648-21hddtemp_smartct10:45:162
173599292,4cyclictest648-21hddtemp_smartct10:45:162
173599291,22cyclictest0-21swapper/210:00:382
173599291,12cyclictest0-21swapper/211:47:212
173599291,11cyclictest0-21swapper/211:01:292
173599291,10cyclictest18585-21cat11:25:192
172199292,10cyclictest2366-21kworker/0:112:02:490
173599287,11cyclictest0-21swapper/208:55:302
173599281,9cyclictest0-21swapper/212:18:582
173599281,7cyclictest0-21swapper/208:53:142
173599281,18cyclictest0-21swapper/210:13:022
173599281,17cyclictest0-21swapper/208:45:502
173599281,15cyclictest0-21swapper/207:51:172
173599281,13cyclictest0-21swapper/210:32:542
173599281,13cyclictest0-21swapper/207:37:212
173599281,12cyclictest0-21swapper/209:37:252
173599280,9cyclictest0-21swapper/212:28:442
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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