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2026-10-22 - 17:46

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #8

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 rackcslot8s.osadl.org (updated Thu Oct 22, 2026 12:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
69722610,0sleep00-21swapper/007:50:110
111391610,4ptp4l0-21swapper/007:09:380
46762600,1sleep773-21ksoftirqd/708:55:147
1957625635,6sleep60-21swapper/607:06:376
111391550,5ptp4l0-21swapper/407:08:114
24512530,0sleep30-21swapper/308:50:143
1881915342,6phc2sys0-21swapper/107:06:051
1949125231,7sleep30-21swapper/307:05:303
1792425240,7sleep70-21swapper/707:05:037
1979124838,6sleep20-21swapper/207:09:212
1951124736,6sleep50-21swapper/507:05:485
111391360,0ptp4l0-21swapper/410:18:034
111391350,0ptp4l0-21swapper/412:35:014
111391350,0ptp4l0-21swapper/409:39:544
111391350,0ptp4l0-21swapper/407:55:224
111391340,0ptp4l0-21swapper/412:15:034
111391340,0ptp4l0-21swapper/411:15:154
111391340,0ptp4l0-21swapper/409:40:114
111391340,0ptp4l0-21swapper/408:45:204
111391330,0ptp4l0-21swapper/412:14:514
111391330,0ptp4l0-21swapper/411:06:584
111391330,0ptp4l0-21swapper/410:52:594
111391330,0ptp4l0-21swapper/410:40:174
111391330,0ptp4l0-21swapper/410:39:344
111391330,0ptp4l0-21swapper/410:25:274
111391330,0ptp4l0-21swapper/409:17:254
111391320,3ptp4l0-21swapper/411:54:434
111391320,0ptp4l0-21swapper/411:47:374
111391320,0ptp4l0-21swapper/410:48:184
111391310,0ptp4l0-21swapper/412:04:514
111391310,0ptp4l0-21swapper/410:10:364
111391310,0ptp4l0-21swapper/410:04:304
111391310,0ptp4l0-21swapper/409:22:464
111391310,0ptp4l0-21swapper/210:00:552
111391300,0ptp4l0-21swapper/411:11:384
111391300,0ptp4l0-21swapper/411:01:104
111391300,0ptp4l0-21swapper/409:59:504
111391300,0ptp4l0-21swapper/409:54:424
111391300,0ptp4l0-21swapper/409:33:194
111391300,0ptp4l0-21swapper/409:26:054
111391300,0ptp4l0-21swapper/408:25:004
111391300,0ptp4l0-21swapper/211:47:012
111391300,0ptp4l0-21swapper/210:05:232
111391300,0ptp4l0-21swapper/010:40:150
111391290,0ptp4l0-21swapper/410:33:454
111391290,0ptp4l0-21swapper/407:30:204
111391290,0ptp4l0-21swapper/212:35:422
111391290,0ptp4l0-21swapper/211:41:292
111391280,3ptp4l0-21swapper/412:21:004
111391280,3ptp4l0-21swapper/412:21:004
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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