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2026-04-23 - 03:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 100 highest latencies:
System rackcslot7s.osadl.org (updated Wed Apr 22, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30672642990,3sleep20-21swapper/212:00:132
139099860,52rtkit-daemon0-21swapper/107:08:201
296322327753,18sleep00-21swapper/007:06:030
296336526444,14sleep20-21swapper/207:07:542
296325826443,14sleep30-21swapper/307:06:313
30220472530,4sleep33056-21PK-Backend09:50:233
30387342500,3sleep10-21swapper/110:40:011
30750202440,2sleep33056-21PK-Backend12:20:193
139099440,3rtkit-daemon0-21swapper/110:42:181
30009832410,4sleep33056-21PK-Backend08:55:003
30132392310,2sleep00-21swapper/009:25:220
139099310,5rtkit-daemon1389-21rtkit-daemon11:40:520
296368099259,14cyclictest3056-21PK-Backend10:59:073
2963670992514,8cyclictest883-21dbus-daemon12:05:010
296367099250,8cyclictest3038838-21taskset10:40:120
139099250,4rtkit-daemon1389-21rtkit-daemon12:10:441
29716322240,3sleep33056-21PK-Backend07:30:123
2963670992421,2cyclictest161rcuc/011:28:190
2963670992417,6cyclictest3045479-21cron10:59:590
139099240,15rtkit-daemon0-21swapper/108:55:021
2963680992320,2cyclictest3056-21PK-Backend07:55:053
296368099230,21cyclictest3056-21PK-Backend08:03:173
2963676992321,1cyclictest0-21swapper/211:39:502
2963673992321,1cyclictest0-21swapper/110:55:181
2963673992315,6cyclictest2968201-21df07:20:141
296367399230,21cyclictest3072475-21hddtemp_smartct12:15:131
296367099233,6cyclictest13-21ksoftirqd/007:22:130
2963670992320,2cyclictest161rcuc/011:12:350
2963670992320,2cyclictest161rcuc/007:36:100
30601892220,3chrt0-21swapper/211:40:132
2963680992220,1cyclictest3056-21PK-Backend11:02:573
296368099220,20cyclictest3056-21PK-Backend10:15:533
296368099220,20cyclictest3056-21PK-Backend07:40:333
2963676992220,1cyclictest0-21swapper/212:05:252
2963676992220,1cyclictest0-21swapper/211:56:342
2963676992220,1cyclictest0-21swapper/210:45:432
2963676992220,1cyclictest0-21swapper/210:10:342
2963676992220,1cyclictest0-21swapper/210:07:172
2963676992220,1cyclictest0-21swapper/209:49:322
2963676992220,1cyclictest0-21swapper/208:28:212
2963676992220,1cyclictest0-21swapper/207:41:572
2963676992218,3cyclictest3000824-21apt-get08:55:032
296367699220,21cyclictest0-21swapper/212:22:502
296367699220,21cyclictest0-21swapper/211:24:092
296367699220,21cyclictest0-21swapper/209:45:002
2963673992220,1cyclictest0-21swapper/110:05:231
2963673992220,1cyclictest0-21swapper/107:14:131
2963673992211,9cyclictest883-21dbus-daemon09:47:461
296367399220,21cyclictest0-21swapper/109:20:341
296367099226,5cyclictest13-21ksoftirqd/007:30:120
2963670992220,1cyclictest0-21swapper/010:46:350
2963670992220,1cyclictest0-21swapper/009:52:200
2963670992220,1cyclictest0-21swapper/009:49:020
2963670992219,2cyclictest161rcuc/011:59:020
2963670992215,5cyclictest3070069-21cron12:10:000
296367099220,6cyclictest3023165-21/usr/sbin/munin09:55:160
296367099220,21cyclictest0-21swapper/010:21:340
139099220,4rtkit-daemon1389-21rtkit-daemon11:31:030
139099220,3rtkit-daemon1389-21rtkit-daemon12:29:210
139099220,14rtkit-daemon0-21swapper/111:06:311
139099220,14rtkit-daemon0-21swapper/111:06:301
2963680992119,1cyclictest3056-21PK-Backend10:05:243
2963680992119,1cyclictest3056-21PK-Backend09:06:243
2963680992119,1cyclictest3056-21PK-Backend08:47:593
2963680992119,1cyclictest3056-21PK-Backend07:26:533
2963680992118,2cyclictest3056-21PK-Backend07:18:223
296368099210,20cyclictest3056-21PK-Backend12:27:123
296368099210,20cyclictest3056-21PK-Backend09:35:173
296368099210,20cyclictest3056-21PK-Backend09:27:333
296368099210,19cyclictest3056-21PK-Backend11:30:363
296368099210,19cyclictest3056-21PK-Backend11:20:413
296368099210,19cyclictest3056-21PK-Backend10:40:403
296368099210,19cyclictest3056-21PK-Backend10:28:173
296368099210,19cyclictest3056-21PK-Backend07:35:123
2963676992119,1cyclictest0-21swapper/211:02:392
2963676992119,1cyclictest0-21swapper/210:54:352
2963676992119,1cyclictest0-21swapper/210:41:092
2963676992119,1cyclictest0-21swapper/209:20:182
2963676992119,1cyclictest0-21swapper/209:18:162
2963676992119,1cyclictest0-21swapper/208:54:032
2963676992119,1cyclictest0-21swapper/208:40:182
2963676992119,1cyclictest0-21swapper/208:22:542
2963676992119,1cyclictest0-21swapper/207:54:212
2963676992119,1cyclictest0-21swapper/207:16:022
2963676992118,2cyclictest3056-21PK-Backend08:17:262
296367699210,20cyclictest0-21swapper/212:28:572
296367699210,20cyclictest0-21swapper/209:37:022
296367699210,20cyclictest0-21swapper/209:26:132
296367699210,20cyclictest0-21swapper/208:01:572
2963673992119,1cyclictest3056-21PK-Backend10:23:401
2963673992119,1cyclictest0-21swapper/112:01:561
2963673992119,1cyclictest0-21swapper/111:41:071
2963673992119,1cyclictest0-21swapper/111:23:231
2963673992119,1cyclictest0-21swapper/111:17:491
2963673992119,1cyclictest0-21swapper/110:54:021
2963673992119,1cyclictest0-21swapper/108:45:061
296367399210,20cyclictest0-21swapper/108:25:181
296367399210,20cyclictest0-21swapper/107:27:461
2963670992119,1cyclictest0-21swapper/012:21:310
2963670992119,1cyclictest0-21swapper/011:51:090
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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