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2026-01-12 - 09:51

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 Mon Jan 12, 2026 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
368482622490,1sleep13684833-21needreboot20:35:201
3589353212765,57sleep30-21swapper/319:09:293
358931927954,19sleep00-21swapper/019:09:020
358917527963,10sleep20-21swapper/219:07:122
358906227863,9sleep10-21swapper/119:05:471
3589504992522,1cyclictest0-21swapper/300:00:013
3589504992521,2cyclictest0-21swapper/323:40:003
358950499231,18cyclictest3902754-21sleep00:05:013
3589504992219,1cyclictest0-21swapper/319:20:153
3589504992218,2cyclictest0-21swapper/323:00:013
3589504992217,2cyclictest0-21swapper/323:44:593
3589504992119,1cyclictest0-21swapper/322:25:003
3589504992119,1cyclictest0-21swapper/320:25:153
3589504992118,1cyclictest0-21swapper/322:35:233
37239712206,4sleep13724957-21cut21:15:171
358950499207,7cyclictest3886634-21taskset23:46:563
3589504991916,1cyclictest0-21swapper/320:33:303
3589504991916,1cyclictest0-21swapper/320:15:173
3589504991915,2cyclictest0-21swapper/322:45:283
3589504991915,2cyclictest0-21swapper/300:20:003
358950499191,14cyclictest0-21swapper/321:50:093
358950499191,14cyclictest0-21swapper/320:10:343
358950499191,13cyclictest3855700-21chrt23:20:113
358950499191,13cyclictest0-21swapper/321:55:093
358950499188,7cyclictest15850irq/127-ahci[0000:00:17.0]20:44:553
358950499185,8cyclictest3708581-21taskset21:00:143
358950499182,11cyclictest3637835-21taskset19:50:213
358950499182,10cyclictest3904830-21taskset00:05:163
358950499182,10cyclictest3742767-21taskset21:30:173
3589504991816,1cyclictest0-21swapper/300:20:143
3589504991814,2cyclictest0-21swapper/320:50:013
358950499181,13cyclictest0-21swapper/323:00:133
358950499181,10cyclictest3735932-21taskset21:25:163
358950499180,13cyclictest0-21swapper/320:35:133
358950499172,10cyclictest3630726-21taskset19:45:163
3589504991714,1cyclictest0-21swapper/323:25:183
3589504991714,1cyclictest0-21swapper/320:50:163
358950499171,3cyclictest0-21swapper/320:06:493
3589504991713,2cyclictest0-21swapper/321:35:273
3589504991713,2cyclictest0-21swapper/321:20:003
3589504991713,2cyclictest0-21swapper/319:40:153
358950499171,14cyclictest0-21swapper/323:50:113
358950499171,13cyclictest3934467-21taskset00:34:463
358950499171,13cyclictest0-21swapper/300:35:103
358950499171,10cyclictest3648577-21taskset20:00:273
358950499171,10cyclictest3621452-21taskset19:35:183
358950499170,15cyclictest0-21swapper/323:10:253
358950499170,11cyclictest3733333-21chrt21:21:313
358950499170,10cyclictest3789166-21taskset22:15:183
358950499170,10cyclictest3749871-21chrt21:40:073
38973462161,10sleep01-21systemd00:00:000
37617672161,10sleep03763491-21grep21:50:150
36380962161,10sleep03638344-21grep19:50:270
36181992161,8sleep23618322-21diskstats19:35:142
358950499162,9cyclictest3775720-21taskset22:02:313
358950499161,9cyclictest3866135-21taskset23:30:013
358950499161,9cyclictest3866135-21taskset23:30:013
3589504991614,1cyclictest0-21swapper/319:25:143
3589504991613,1cyclictest0-21swapper/319:55:163
3589504991613,1cyclictest0-21swapper/319:10:173
3589504991612,2cyclictest0-21swapper/323:05:173
358950499161,12cyclictest0-21swapper/322:05:223
358950499161,11cyclictest0-21swapper/320:55:213
358950499160,13cyclictest0-21swapper/322:50:133
358950499160,13cyclictest0-21swapper/322:10:263
358950499160,13cyclictest0-21swapper/300:10:193
358950499160,12cyclictest0-21swapper/322:30:203
358950499160,10cyclictest3665206-21taskset20:20:073
358950499160,10cyclictest3665206-21taskset20:20:063
39300532151,9sleep23930807-21grep00:30:172
37286842151,9sleep03728906-21cat21:20:130
37082642151,8sleep23708577-21kthreadcore21:00:142
37074352151,5sleep03707448-21turbostat.cron21:00:010
36657712151,9sleep23666491-21cut20:20:152
36657712151,9sleep23666491-21cut20:20:152
36028852151,9sleep13604411-21tr19:20:181
358950499151,9cyclictest3855044-21taskset23:15:383
358950499151,9cyclictest3797425-21taskset22:25:123
358950499151,9cyclictest3717664-21taskset21:06:563
358950499151,10cyclictest3929261-21sleep00:30:003
358950499150,12cyclictest0-21swapper/322:40:093
358950499150,12cyclictest0-21swapper/321:45:143
358950499150,12cyclictest0-21swapper/321:10:113
358950499150,12cyclictest0-21swapper/319:15:153
358950499150,12cyclictest0-21swapper/319:15:143
358950499141,11cyclictest0-21swapper/319:35:013
38556782132,5sleep23855697-21apt-get23:20:112
38188772131,7sleep13819000-21diskstats22:45:151
37827052131,7sleep23784422-21kthreadcore22:10:172
36563022131,8sleep03658057-21cut20:10:190
36525452131,8sleep13653303-21sed20:05:191
36335212131,8sleep23633526-21cron19:50:012
38753602121,7sleep03875404-21collect223:35:200
38446282121,8sleep1800-21snmpd23:05:431
38299222121,7sleep23830060-21kthreadcore22:55:142
37440222122,7sleep0800-21snmpd21:34:160
36844382121,7sleep03684820-21needreboot20:35:200
36236012121,7sleep03623790-21gltestperf19:40:120
35902612124,4sleep13591298-21cut19:10:151
39029822110,2sleep10-21swapper/100:05:101
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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