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2026-08-31 - 19:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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 rack7slot7s.osadl.org (updated Mon Aug 31, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1627529669,9sleep20-21swapper/207:08:252
1610029379,9sleep00-21swapper/007:06:090
1606629142,45sleep10-21swapper/107:05:431
1637828269,9sleep30-21swapper/307:09:473
62032500,0sleep00-21swapper/009:26:490
321012460,0sleep10-21swapper/110:59:511
174282310,0chrt17429-21sh10:31:010
1649199310,1cyclictest0-21swapper/312:11:043
1649199302,27cyclictest0-21swapper/311:46:173
1649199300,28cyclictest0-21swapper/312:00:473
1649199296,19cyclictest225-21systemd-journal10:30:003
1649199291,27cyclictest11264-21grep09:50:013
1649199290,1cyclictest0-21swapper/309:15:133
1649199282,25cyclictest9291-21diskmemload11:18:233
1649199280,27cyclictest0-21swapper/309:55:243
1649199280,1cyclictest0-21swapper/309:44:453
1649199272,24cyclictest9291-21diskmemload12:06:513
1649199272,24cyclictest0-21swapper/309:40:013
1649199271,1cyclictest9291-21diskmemload11:58:053
1649199270,26cyclictest0-21swapper/309:30:113
1649199270,26cyclictest0-21swapper/309:30:113
1649199270,25cyclictest9291-21diskmemload12:24:063
1649199270,1cyclictest0-21swapper/311:31:223
1649199264,21cyclictest9291-21diskmemload11:41:103
1649199261,24cyclictest0-21swapper/311:10:103
1649199261,22cyclictest0-21swapper/311:21:433
18962250,0sleep30-21swapper/310:21:583
1649199251,21cyclictest9291-21diskmemload11:07:223
1649199251,21cyclictest9291-21diskmemload11:07:213
1649199250,23cyclictest0-21swapper/309:50:513
1649199250,1cyclictest0-21swapper/311:25:143
1648899250,24cyclictest0-21swapper/210:55:002
1648499251,1cyclictest0-21swapper/110:06:351
1649199242,20cyclictest9291-21diskmemload09:14:173
1649199241,23cyclictest0-21swapper/311:50:183
1649199240,23cyclictest0-21swapper/310:50:023
1649199240,23cyclictest0-21swapper/310:14:573
16488992423,1cyclictest0-21swapper/210:37:052
1649199232,20cyclictest9291-21diskmemload10:07:553
1649199230,2cyclictest0-21swapper/311:01:173
1649199230,2cyclictest0-21swapper/310:31:263
1648899230,23cyclictest0-21swapper/211:53:062
1649199227,14cyclictest27727-21sh10:56:263
1649199225,16cyclictest9291-21diskmemload12:29:463
1649199221,2cyclictest9291-21diskmemload10:01:063
1649199220,3cyclictest5400-21ssh09:26:143
1649199220,21cyclictest0-21swapper/312:35:193
1649199220,21cyclictest0-21swapper/310:45:033
1649199220,1cyclictest0-21swapper/310:39:203
1649199220,1cyclictest0-21swapper/307:15:143
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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