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2025-09-18 - 19:22

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 Thu Sep 18, 2025 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
11365210982,9sleep30-21swapper/307:05:523
1156829784,9sleep10-21swapper/107:08:321
1161628464,15sleep20-21swapper/207:09:082
1159428169,8sleep00-21swapper/007:08:510
302872640,0sleep30-21swapper/310:16:063
1178099301,28cyclictest0-21swapper/209:44:342
11775992927,2cyclictest13-21ksoftirqd/010:45:000
11780992624,1cyclictest4829-21diskmemload12:12:322
11784992524,1cyclictest0-21swapper/312:21:583
11780992518,6cyclictest0-21swapper/212:15:122
11780992514,8cyclictest4829-21diskmemload10:15:332
11780992514,10cyclictest4829-21diskmemload10:12:182
1178099247,16cyclictest0-21swapper/208:25:182
1178099240,24cyclictest0-21swapper/210:45:522
247112230,0sleep10-21swapper/108:40:271
1178099239,8cyclictest4829-21diskmemload11:30:272
1178099239,8cyclictest4829-21diskmemload11:30:272
1178099234,16cyclictest0-21swapper/209:56:332
1178099234,16cyclictest0-21swapper/209:56:322
11780992321,1cyclictest0-21swapper/211:35:132
11780992320,2cyclictest6425-21hddtemp_smartct09:10:172
1178099231,21cyclictest0-21swapper/210:01:452
11778992321,2cyclictest25-21ksoftirqd/111:11:361
1177899230,2cyclictest0-21swapper/112:05:171
1177899230,23cyclictest0-21swapper/111:43:301
1177599234,1cyclictest24442-21ssh10:55:190
11780992220,2cyclictest4829-21diskmemload09:34:532
11780992220,1cyclictest0-21swapper/211:45:592
11780992219,3cyclictest4829-21diskmemload09:36:352
11780992217,4cyclictest30132-21sh11:20:092
11780992216,5cyclictest0-21swapper/208:30:162
11780992215,6cyclictest0-21swapper/211:57:032
11780992213,8cyclictest4829-21diskmemload09:16:052
11780992213,7cyclictest0-21swapper/212:30:142
11780992211,8cyclictest4829-21diskmemload11:00:182
324102210,0sleep20-21swapper/211:41:562
11780992114,6cyclictest4829-21diskmemload10:05:232
11780992114,6cyclictest4600-21open_inodes08:00:212
11780992111,6cyclictest0-21swapper/210:35:002
11778992120,1cyclictest0-21swapper/110:07:161
92492200,0sleep30-21swapper/309:12:383
168002200,0sleep00-21swapper/011:31:440
168002200,0sleep00-21swapper/011:31:440
1178099207,10cyclictest0-21swapper/210:29:502
1178099206,13cyclictest0-21swapper/209:21:482
11780992013,6cyclictest3736-21ssh10:20:282
11780992012,7cyclictest5052-21ssh12:05:502
11780992012,1cyclictest4829-21diskmemload11:53:532
11780992010,8cyclictest0-21swapper/211:25:362
1177599203,2cyclictest18956-21ssh10:08:390
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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