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2025-12-16 - 11:19

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 Tue Dec 16, 2025 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
383772212361,58sleep30-21swapper/319:07:463
54043121180,2sleep30-21swapper/321:35:153
38378728559,20sleep00-21swapper/019:07:560
38385328353,9sleep10-21swapper/119:08:491
38383928252,9sleep20-21swapper/219:08:382
384067992724,1cyclictest0-21swapper/300:05:133
38406799252,19cyclictest638501-21taskset23:08:293
384067992118,1cyclictest0-21swapper/320:10:003
38406799198,8cyclictest486684-21chrt20:45:103
38406799192,11cyclictest454682-21taskset20:15:113
384067991916,1cyclictest0-21swapper/322:40:013
384067991916,1cyclictest0-21swapper/321:10:203
384067991916,1cyclictest0-21swapper/320:40:123
384067991916,1cyclictest0-21swapper/320:40:023
384067991915,2cyclictest0-21swapper/323:30:143
384067991915,2cyclictest0-21swapper/319:55:133
38406799191,15cyclictest0-21swapper/322:20:113
38406799191,14cyclictest5288742chrt21:25:133
38406799191,13cyclictest581047-21turbostat22:15:003
38406799191,11cyclictest720516-21taskset00:25:173
38406799191,11cyclictest405000-21taskset19:25:173
384067991815,1cyclictest0-21swapper/322:40:163
384067991814,2cyclictest0-21swapper/320:25:003
38406799181,14cyclictest0-21swapper/322:45:123
38406799181,13cyclictest565617-21chrt22:00:123
38406799181,13cyclictest549362-21turbostat21:45:003
38406799181,13cyclictest467353-21taskset20:25:183
38406799181,13cyclictest0-21swapper/323:20:123
38406799181,13cyclictest0-21swapper/322:25:123
38406799181,13cyclictest0-21swapper/319:45:103
38406799181,11cyclictest553198-21taskset21:45:173
38406799180,14cyclictest0-21swapper/323:35:173
5975242171,5sleep1598913-21cut22:30:171
4124262171,4sleep2412445-21apt-get19:35:112
384067991714,1cyclictest0-21swapper/322:50:143
384067991714,1cyclictest0-21swapper/321:15:163
38406799171,13cyclictest0-21swapper/323:15:143
38406799171,13cyclictest0-21swapper/319:35:153
38406799171,12cyclictest0-21swapper/320:55:113
38406799171,12cyclictest0-21swapper/319:30:113
38406799171,10cyclictest422489-21taskset19:43:013
38406799170,10cyclictest639152-21taskset23:10:063
4549392161,10sleep0454989-21fschecks_count20:15:130
38406799168,4cyclictest6865792sleep323:55:113
38406799166,6cyclictest443623-21taskset20:04:453
38406799161,9cyclictest679272-21taskset23:45:163
38406799161,9cyclictest581286-21taskset22:15:083
38406799161,9cyclictest555117-21taskset21:50:023
384067991612,2cyclictest0-21swapper/322:55:163
38406799161,13cyclictest0-21swapper/322:30:153
38406799161,12cyclictest0-21swapper/321:20:553
38406799161,11cyclictest560839-21chrt21:55:153
38406799161,11cyclictest502448-21chrt21:00:123
38406799161,11cyclictest0-21swapper/320:50:183
38406799161,10cyclictest706965-21taskset00:10:293
38406799161,10cyclictest389163-21chrt19:14:353
38406799160,13cyclictest0-21swapper/319:50:153
38406799160,13cyclictest0-21swapper/319:15:163
38406799160,13cyclictest0-21swapper/300:30:163
7271632151,5sleep1727251-21ntpq00:30:171
5135082151,10sleep1514281-21cut21:10:181
4753372151,9sleep0475836-21gpg-connect-age20:35:010
38406799151,9cyclictest733199-21taskset00:36:353
38406799151,9cyclictest685976-21taskset23:50:423
38406799151,9cyclictest511514-21taskset21:05:173
384067991512,1cyclictest0-21swapper/319:20:153
384067991512,1cyclictest0-21swapper/300:15:153
384067991512,1cyclictest0-21swapper/300:00:283
384067991511,2cyclictest0-21swapper/323:25:133
38406799151,11cyclictest717823-21turbostat00:25:003
38406799150,13cyclictest0-21swapper/320:10:013
38406799150,12cyclictest0-21swapper/323:40:213
38406799150,12cyclictest0-21swapper/323:00:103
38406799150,12cyclictest0-21swapper/320:30:113
6132352141,8sleep1613533-21grep22:45:161
5603612141,9sleep0560473-21cut21:55:140
38406799141,10cyclictest575833-21turbostat22:10:003
38406799140,12cyclictest0-21swapper/321:30:143
6767192131,8sleep10-21swapper/123:45:161
5760842131,8sleep2576289-21expr22:10:142
5077022131,8sleep1507912-21expr21:05:121
3917272130,9sleep2391958-21cat19:15:152
6497112122,5sleep1649730-21apt-get23:20:101
6323902121,7sleep2632445-21modprobe23:00:212
6237402121,7sleep0624447-21kthreadcore22:55:170
4330992121,3sleep2433102-21sshd19:54:552
4072202121,7sleep0407407-21cstates19:30:120
4023492121,7sleep0402518-21if_err_enp1s019:25:150
3939792121,5sleep1395263-21memory19:15:181
3847912121,7sleep0384848-21kthreadcore19:10:170
7238752111,6sleep2724795-21kthreadcore00:30:132
7180742111,4sleep1718093-21apt-get00:25:111
7070942110,1sleep10-21swapper/100:12:091
6391272111,6sleep2638631-21apt-get23:10:022
6244482111,6sleep1626175-21kthreadcore22:55:181
5855582110,7sleep1581292-21/usr/sbin/munin22:15:271
5760622112,4sleep1576081-21apt-get22:10:131
4716582112,5sleep1473402-21cut20:30:171
4656382110,7sleep10-21swapper/120:25:161
4546602111,5sleep20-21swapper/220:15:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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