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2025-12-11 - 07:25

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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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 rack3slot3s.osadl.org (updated Thu Dec 11, 2025 00:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
505164213159,67sleep30-21swapper/319:05:083
97058921120,3sleep0221rcuc/000:30:170
50978428153,20sleep00-21swapper/019:05:460
50995628064,9sleep20-21swapper/219:07:562
51009627955,19sleep10-21swapper/119:09:431
510258992522,1cyclictest0-21swapper/323:40:003
510258992521,2cyclictest0-21swapper/323:24:593
51025899242,16cyclictest764649-21taskset22:25:133
51025899242,14cyclictest718584-21taskset21:55:183
510258992421,1cyclictest0-21swapper/322:48:543
510258992421,1cyclictest0-21swapper/321:50:193
510258992419,2cyclictest0-21swapper/323:55:233
51025899232,13cyclictest973147-21taskset00:30:323
51025899229,7cyclictest821649-21taskset22:59:363
51025899221,17cyclictest0-21swapper/322:11:183
510258992210,9cyclictest755913-21turbostat22:24:543
510258992118,1cyclictest0-21swapper/321:34:203
510258992118,1cyclictest0-21swapper/321:34:193
510258992117,2cyclictest0-21swapper/322:05:223
510258992116,2cyclictest0-21swapper/322:15:253
51025899211,16cyclictest564640-21taskset19:55:243
9666142201,2sleep10-21swapper/100:27:461
51025899202,13cyclictest958458-21taskset00:21:263
51025899202,12cyclictest976182-21taskset00:35:053
51025899202,12cyclictest806052-21taskset22:50:013
51025899202,12cyclictest706287-21taskset21:50:013
51025899202,11cyclictest567454-21taskset20:00:183
510258992017,1cyclictest0-21swapper/321:25:173
510258992017,1cyclictest0-21swapper/321:00:263
510258992017,1cyclictest0-21swapper/320:50:183
510258992017,1cyclictest0-21swapper/319:40:013
510258992017,1cyclictest0-21swapper/300:05:163
51025899201,15cyclictest515509-21turbostat19:15:003
51025899201,14cyclictest656585-21chrt21:20:143
510258991916,1cyclictest0-21swapper/323:42:063
510258991916,1cyclictest0-21swapper/319:15:163
510258991915,2cyclictest0-21swapper/323:15:283
510258991915,2cyclictest0-21swapper/322:30:013
510258991915,2cyclictest0-21swapper/300:15:003
510258991913,3cyclictest0-21swapper/323:25:173
51025899191,13cyclictest875796-21chrt23:30:223
51025899191,13cyclictest838543-21chrt23:10:063
51025899191,13cyclictest644606-21chrt21:10:363
51025899190,17cyclictest0-21swapper/321:19:183
9604272181,8sleep2960437-21ssh00:25:062
9343442181,10sleep1639289-21diskmemload00:06:051
7910102181,9sleep20-21swapper/222:40:152
51025899182,11cyclictest729522-21taskset22:02:433
510258991815,2cyclictest0-21swapper/320:55:183
510258991814,2cyclictest0-21swapper/300:15:183
510258991814,2cyclictest0-21swapper/300:00:173
51025899181,14cyclictest0-21swapper/323:51:503
51025899181,14cyclictest0-21swapper/323:07:513
51025899181,14cyclictest0-21swapper/322:35:123
51025899181,13cyclictest597342-21chrt20:30:123
51025899181,13cyclictest0-21swapper/323:45:093
51025899181,13cyclictest0-21swapper/320:15:123
51025899181,12cyclictest792665-21chrt22:40:153
51025899181,11cyclictest634321-21taskset21:05:103
51025899180,14cyclictest0-21swapper/323:00:183
51025899180,14cyclictest0-21swapper/321:35:133
9456042172,8sleep1945825-21hddtemp_smartct00:15:151
8284672171,4sleep2639289-21diskmemload23:02:332
8072402171,7sleep2808852-21kthreadcore22:50:172
7816532171,8sleep2781870-21hddtemp_smartct22:35:152
6465422171,3sleep20-21swapper/221:13:372
510258991714,1cyclictest0-21swapper/319:25:173
51025899171,13cyclictest696395-21chrt21:42:423
510258991710,5cyclictest66550irq/131-enp1s0-TxRx-300:25:163
9723582161,8sleep2972405-21ntpq00:30:202
9372122161,10sleep2937231-21sh00:10:122
9266352161,10sleep2926647-21sh00:01:462
8879792161,3sleep20-21swapper/223:40:132
8779482161,9sleep0639289-21diskmemload23:33:060
8540982161,10sleep2854108-21ssh23:19:212
8440492161,4sleep1639289-21diskmemload23:11:261
8300562161,10sleep0830070-21ssh23:04:550
7781782161,2sleep20-21swapper/222:30:452
6963822161,2sleep20-21swapper/221:42:422
6540492161,3sleep1639289-21diskmemload21:17:251
6532582160,1sleep20-21swapper/221:16:182
6396502161,10sleep1639680-21apt-get21:10:111
5406952161,10sleep1542514-21grep19:35:151
5312742161,10sleep2532178-21memory19:25:192
5288762161,4sleep0529532-21cut19:25:170
51025899161,9cyclictest602581-21taskset20:35:003
510258991612,1cyclictest0-21swapper/319:40:023
51025899161,12cyclictest0-21swapper/319:20:233
51025899160,13cyclictest0-21swapper/320:45:183
51025899160,13cyclictest0-21swapper/320:10:203
9818052151,4sleep2981815-21ssh00:36:412
9137982151,9sleep2915415-21kthreadcore23:55:172
9034482151,9sleep0903460-21ssh23:49:080
8777802151,2sleep20-21swapper/223:32:522
8455752151,8sleep2639289-21diskmemload23:13:432
8275632151,9sleep1827574-21ssh23:01:081
7878132151,4sleep0787826-21ssh22:37:540
7449922151,3sleep10-21swapper/122:11:081
7204592151,7sleep1639289-21diskmemload21:56:371
6616012151,9sleep0661612-21ssh21:20:520
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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