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2025-12-03 - 21:48

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 Wed Dec 03, 2025 12:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13441210478,9sleep10-21swapper/107:08:001
1325329780,12sleep30-21swapper/307:05:333
1352628469,10sleep00-21swapper/007:09:020
1336428164,13sleep20-21swapper/207:07:002
1368199321,29cyclictest6338-21idleruntime-cro09:10:003
1368199271,25cyclictest0-21swapper/311:53:393
1368199271,24cyclictest6330-21diskmemload11:07:393
1368199261,24cyclictest6330-21diskmemload11:27:003
1368199248,14cyclictest6330-21diskmemload11:37:453
1368199241,17cyclictest6330-21diskmemload09:37:333
1368199240,20cyclictest0-21swapper/308:15:123
1368199240,16cyclictest0-21swapper/310:00:103
1367499240,1cyclictest0-21swapper/012:16:260
1368199234,16cyclictest6330-21diskmemload09:59:203
1368199232,20cyclictest6330-21diskmemload09:27:433
1368199232,20cyclictest6330-21diskmemload09:27:433
1367799230,1cyclictest0-21swapper/207:30:282
1367799230,1cyclictest0-21swapper/207:30:272
1367799230,19cyclictest0-21swapper/211:25:522
1368199226,15cyclictest6330-21diskmemload10:43:523
1368199226,14cyclictest12790-21ssh11:33:383
13681992221,1cyclictest0-21swapper/312:17:353
1368199221,18cyclictest6330-21diskmemload09:46:283
1368199221,17cyclictest6330-21diskmemload10:46:443
1368199220,17cyclictest0-21swapper/307:15:253
1367799220,22cyclictest0-21swapper/209:24:162
1367799220,21cyclictest0-21swapper/209:25:142
1367799220,21cyclictest0-21swapper/209:25:142
1367599224,13cyclictest224-21systemd-journal11:22:281
1367499220,1cyclictest0-21swapper/009:56:300
1368199217,11cyclictest28249-21expr10:25:143
1368199213,14cyclictest6330-21diskmemload10:39:003
1368199212,18cyclictest6330-21diskmemload09:53:583
1368199210,17cyclictest6330-21diskmemload09:16:003
1367799212,2cyclictest0-21swapper/210:50:182
1367799210,1cyclictest0-21swapper/210:20:342
13674992120,1cyclictest0-21swapper/012:24:240
1368199209,8cyclictest29840-21find07:40:383
1368199205,14cyclictest26663-21sh11:45:183
1368199202,15cyclictest6330-21diskmemload12:24:213
1368199200,19cyclictest6330-21diskmemload10:34:403
1368199200,19cyclictest0-21swapper/309:24:313
1367799200,3cyclictest18744-21cut07:20:002
1367799200,20cyclictest0-21swapper/212:24:242
1367799200,20cyclictest0-21swapper/211:13:042
1367799200,13cyclictest0-21swapper/211:00:412
1367599200,18cyclictest0-21swapper/112:21:471
1368199199,9cyclictest61750irq/125-enp2s0-11:43:013
1368199198,10cyclictest6330-21diskmemload10:10:123
1368199192,16cyclictest0-21swapper/308:50:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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