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2026-03-13 - 08:10

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 100 highest latencies:
System rackeslot5s.osadl.org (updated Fri Mar 13, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
9323993023,1cyclictest20740-21cpu23:31:510
932699271,0cyclictest331rcuc/323:13:593
932599261,24cyclictest2988-21diskmemload23:44:032
9326992525,0cyclictest331rcuc/323:19:273
9326992523,1cyclictest0-21swapper/322:32:303
9326992523,1cyclictest0-21swapper/321:58:413
9326992522,2cyclictest2988-21diskmemload23:37:003
932699250,24cyclictest2988-21diskmemload23:49:113
9325992523,2cyclictest29303-21apt-get19:51:502
9325992523,2cyclictest27627-21unixbench_multi23:37:002
932599252,22cyclictest0-21swapper/223:21:512
9325992521,2cyclictest2988-21diskmemload21:14:542
932599251,24cyclictest0-21swapper/223:19:272
932499250,24cyclictest18246-21ssh22:57:141
932499250,24cyclictest0-21swapper/100:17:001
932499250,1cyclictest0-21swapper/123:54:451
932399250,24cyclictest0-21swapper/022:16:510
9326992423,1cyclictest0-21swapper/322:05:313
932699241,22cyclictest2015-21kworker/u8:100:35:533
932699241,22cyclictest15724-21sh22:24:263
932699240,23cyclictest679-21ssh22:41:513
932699240,1cyclictest0-21swapper/323:44:033
932699240,0cyclictest0-21swapper/300:28:103
932599241,22cyclictest25638-21ssh22:33:432
932599240,24cyclictest2988-21diskmemload22:45:042
932599240,23cyclictest27134-21ssh22:04:072
932599240,0cyclictest0-21swapper/200:28:102
9324992424,0cyclictest0-21swapper/122:20:231
9324992421,1cyclictest313-21systemd-journal19:20:001
932499240,24cyclictest0-21swapper/122:12:541
932499240,24cyclictest0-21swapper/121:37:261
932499240,23cyclictest0-21swapper/119:21:511
9323992424,0cyclictest2988-21diskmemload21:57:380
9323992422,1cyclictest0-21swapper/022:57:430
9323992421,2cyclictest0-21swapper/000:08:180
932399241,1cyclictest0-21swapper/022:11:270
932399240,2cyclictest8667-21ssh23:51:190
932399240,2cyclictest4472-21cron22:45:000
9326992323,0cyclictest0-21swapper/300:03:513
9326992322,1cyclictest0-21swapper/319:51:503
9326992321,2cyclictest0-21swapper/300:06:103
9326992321,1cyclictest19914-21ssh23:30:413
9326992321,1cyclictest0-21swapper/322:35:443
9326992321,1cyclictest0-21swapper/321:45:243
932699232,0cyclictest10318-21apt-get23:21:513
932699231,21cyclictest0-21swapper/322:57:053
932699230,2cyclictest15520-21which21:21:533
932699230,2cyclictest0-21swapper/321:51:513
932699230,23cyclictest2988-21diskmemload23:52:413
932699230,23cyclictest0-21swapper/323:05:053
932699230,23cyclictest0-21swapper/322:45:043
932699230,23cyclictest0-21swapper/321:44:063
932699230,22cyclictest7516-21ssh00:21:193
932699230,22cyclictest4891-21ssh22:13:413
932699230,22cyclictest2988-21diskmemload22:52:243
932699230,22cyclictest26868-21ssh22:03:433
932699230,22cyclictest0-21swapper/323:02:543
932699230,22cyclictest0-21swapper/321:13:173
932699230,1cyclictest22417-21ssh21:27:533
932699230,1cyclictest0-21swapper/300:32:233
9325992323,0cyclictest2988-21diskmemload22:58:072
9325992323,0cyclictest2988-21diskmemload22:50:142
9325992323,0cyclictest0-21swapper/222:05:312
9325992323,0cyclictest0-21swapper/221:53:032
9325992322,1cyclictest32119-21ssh22:40:142
9325992321,1cyclictest9937-21cstates21:16:532
9325992321,1cyclictest32303-21sh00:12:562
9325992321,1cyclictest18492-21ssh21:24:522
9325992319,3cyclictest22838-21ssh00:35:192
9325992319,3cyclictest0-21swapper/222:10:202
932599231,22cyclictest271rcuc/223:48:312
932599230,2cyclictest19931-21ssh23:30:432
932599230,23cyclictest2988-21diskmemload23:05:052
932599230,23cyclictest0-21swapper/223:29:362
932599230,23cyclictest0-21swapper/223:00:092
932599230,23cyclictest0-21swapper/221:47:592
932599230,23cyclictest0-21swapper/221:26:122
932599230,22cyclictest20001-21diskstats00:01:542
932599230,22cyclictest13632-21sh23:55:532
932599230,22cyclictest0-21swapper/221:55:242
932599230,1cyclictest2988-21diskmemload22:27:292
932599230,1cyclictest2988-21diskmemload00:16:402
932599230,0cyclictest0-21swapper/223:12:572
932599230,0cyclictest0-21swapper/221:44:062
9324992323,0cyclictest2988-21diskmemload23:48:421
9324992323,0cyclictest0-21swapper/123:10:031
9324992323,0cyclictest0-21swapper/122:40:391
9324992323,0cyclictest0-21swapper/122:15:231
9324992323,0cyclictest0-21swapper/100:36:111
9324992323,0cyclictest0-21swapper/100:06:141
9324992321,2cyclictest20564-21ssh23:31:401
932499230,23cyclictest0-21swapper/123:17:001
932499230,23cyclictest0-21swapper/121:23:381
932499230,23cyclictest0-21swapper/121:16:351
932499230,22cyclictest2988-21diskmemload22:48:051
932499230,22cyclictest22158-21ssh21:27:291
932499230,22cyclictest211rcuc/100:22:021
932499230,22cyclictest20898-21ssh21:57:271
932499230,22cyclictest20444-21ssh23:00:141
932499230,22cyclictest15666-21ssh00:28:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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