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2026-06-01 - 01:52

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 Sun May 31, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2955929280,8sleep00-21swapper/007:06:040
2965429165,8sleep30-21swapper/307:07:193
2985728777,6sleep20-21swapper/207:09:552
2953528568,13sleep10-21swapper/107:05:441
130882710,0sleep30-21swapper/309:23:103
2994899280,28cyclictest0-21swapper/211:04:482
2994899280,28cyclictest0-21swapper/209:44:442
2994399280,0cyclictest0-21swapper/112:08:301
2994899250,25cyclictest0-21swapper/211:14:482
2994899250,25cyclictest0-21swapper/209:12:392
2994399253,10cyclictest0-21swapper/111:50:131
60352240,2sleep232-21ksoftirqd/211:34:242
29939992423,1cyclictest0-21swapper/010:02:020
2993999240,1cyclictest0-21swapper/011:36:380
2993999240,1cyclictest0-21swapper/011:22:110
2993999240,1cyclictest0-21swapper/009:58:190
2994899230,21cyclictest0-21swapper/212:10:022
2993999230,1cyclictest0-21swapper/011:49:540
2993999230,0cyclictest0-21swapper/011:02:190
2994899220,22cyclictest0-21swapper/211:41:032
2994899220,22cyclictest0-21swapper/211:17:082
29939992222,0cyclictest0-21swapper/010:28:150
2993999220,1cyclictest0-21swapper/010:58:200
29948992120,1cyclictest0-21swapper/209:53:072
2993999210,2cyclictest0-21swapper/009:11:270
2995399204,8cyclictest0-21swapper/310:00:143
29948992016,1cyclictest32-21ksoftirqd/210:31:222
29948992015,1cyclictest32-21ksoftirqd/210:37:322
2994899200,1cyclictest0-21swapper/210:11:512
2993999200,3cyclictest0-21swapper/011:28:520
2993999200,3cyclictest0-21swapper/009:24:090
2993999200,20cyclictest0-21swapper/010:41:000
2993999200,1cyclictest0-21swapper/010:46:570
2994899191,17cyclictest0-21swapper/209:45:162
2994899190,19cyclictest0-21swapper/211:39:572
2994399191,17cyclictest22737-21diskmemload10:16:511
29939991919,0cyclictest0-21swapper/011:56:360
2993999190,4cyclictest0-21swapper/011:32:590
2993999190,2cyclictest0-21swapper/012:03:130
2993999190,1cyclictest0-21swapper/012:18:180
245382190,0sleep20-21swapper/210:08:462
2994399182,13cyclictest9868-21apache_volume10:00:131
324152170,0sleep10-21swapper/111:10:351
2995399172,10cyclictest4398-21/usr/sbin/munin12:30:233
29948991716,1cyclictest0-21swapper/211:59:462
2994899171,1cyclictest0-21swapper/210:25:282
2994899171,15cyclictest0-21swapper/210:48:542
2994899170,17cyclictest0-21swapper/210:01:402
2994899170,16cyclictest0-21swapper/212:00:112
2994399170,0cyclictest0-21swapper/110:33:101
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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