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2026-04-14 - 21:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #4

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 highest latencies:
System rack9slot4s (updated Tue Apr 14, 2026 12:59:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
107499912721235,30cyclictest29348-21tune2fs09:20:171
107489912582,5cyclictest11178-21df_inode07:25:140
107499911361106,26cyclictest11067-21cpuspeed_turbos07:25:131
103382889843,31sleep00-21swapper/007:21:150
104892468418,29sleep10-21swapper/107:22:541
107489911289,20cyclictest0-21swapper/009:20:170
285542760,3sleep028555-21rm09:20:000
1074999652,50cyclictest0-21swapper/109:36:171
1074999649,42cyclictest0-21swapper/111:45:491
1074999642,44cyclictest24355-21taskset07:55:431
10749996411,33cyclictest0-21swapper/109:16:171
1074999636,39cyclictest0-21swapper/109:44:201
10749996314,30cyclictest19677-21cat09:10:171
1074999621,42cyclictest26704-21ssh10:58:001
1074999621,13cyclictest30117-21taskset08:11:591
10749996210,5cyclictest3371-21ntp_states11:40:291
74992610,3sleep07500-21sh12:52:460
1074999618,41cyclictest0-21swapper/112:10:271
1074999611,41cyclictest0-21swapper/110:30:581
1074999603,49cyclictest7970-21diskstats08:40:151
1074999601,6cyclictest18799-21diskmemload12:05:141
1074999601,40cyclictest15137-21ssh12:25:431
10749996010,5cyclictest2206-21dbus-daemon11:50:561
1074999592,8cyclictest6065-21df08:35:141
1074999591,9cyclictest25787-21ssh12:37:121
1074999591,5cyclictest28583-21smartctl12:40:191
1074999585,6cyclictest40550irq/92-i91510:36:131
1074999584,7cyclictest21013-21diskstats09:45:161
1074999584,7cyclictest21013-21diskstats09:45:161
1074999584,3cyclictest0-21swapper/110:50:181
1074999583,7cyclictest30578-21iostat_ios11:35:231
1074999583,4cyclictest0-21swapper/110:03:141
1074999582,10cyclictest11658-21/usr/sbin/munin11:15:291
1074999581,6cyclictest18799-21diskmemload09:27:471
1074999581,5cyclictest18037-21chrt07:40:241
1074999581,5cyclictest13892-21/usr/sbin/munin10:45:161
10749995815,37cyclictest10073-21ssh09:34:041
10749995812,30cyclictest22-21ksoftirqd/111:59:231
1074999575,8cyclictest0-21swapper/111:08:261
1074999571,5cyclictest30571-21cstates09:55:131
1074999571,5cyclictest18799-21diskmemload10:24:261
10749995712,5cyclictest18418-21aten_r4power_en12:30:121
10749995712,4cyclictest0-21swapper/112:00:261
1074999571,11cyclictest0-21swapper/112:17:561
1074999568,5cyclictest40550irq/92-i91510:10:251
1074999567,5cyclictest40550irq/92-i91507:45:271
1074999564,9cyclictest4202-21diskstats08:30:171
1074999563,7cyclictest27116-21df_inode08:05:131
1074999561,6cyclictest1740-21seq12:45:361
1074999561,11cyclictest8489-21kworker/1:111:11:091
1074999561,11cyclictest10809-21grep08:45:291
1074999552,8cyclictest30875-21df_inode08:15:151
1074999551,14cyclictest12930-21chrt08:52:491
1074999551,13cyclictest9833-21ssh10:06:321
10749995510,6cyclictest148602chrt07:32:041
1074999543,6cyclictest15799-21iostat09:00:191
1074999542,8cyclictest13604-21df_inode08:55:151
1074999542,7cyclictest25353-21df_inode11:30:141
1074999542,5cyclictest0-21swapper/108:00:111
10749995413,36cyclictest0-21swapper/110:29:091
1074999541,14cyclictest29967-21ssh11:00:411
1074999541,14cyclictest17687-21ssh11:21:441
1074999533,42cyclictest9816-21cut10:40:231
1074999532,6cyclictest2200-21df_inode08:25:121
1074999532,6cyclictest2200-21df_inode08:25:121
1074999531,7cyclictest24626-21rm11:29:481
1074999531,11cyclictest0-21swapper/112:20:211
1074999531,11cyclictest0-21swapper/112:20:201
10749995310,3cyclictest0-21swapper/109:50:261
1074999526,3cyclictest0-21swapper/110:18:201
1074999512,8cyclictest2206-21dbus-daemon09:07:411
1074999511,14cyclictest22492-21taskset07:50:501
10749995012,34cyclictest7516-21sh12:52:481
1074999492,15cyclictest16182-21/usr/sbin/munin07:35:261
10749994916,27cyclictest22-21ksoftirqd/108:22:501
82212450,7sleep00-21swapper/012:19:410
162112440,7sleep01074899cyclictest10:13:480
223262430,5sleep0111rcuc/011:26:270
1074899412,35cyclictest0-21swapper/010:28:550
238912400,9sleep01074899cyclictest07:55:250
36092381,30sleep03631-21munin-run12:15:010
1074899387,27cyclictest0-21swapper/010:46:550
91712370,7sleep01074899cyclictest10:40:140
259142370,10sleep01074899cyclictest12:37:210
249522371,3sleep024962-21ssh09:49:380
249522371,3sleep024962-21ssh09:49:380
10748993729,5cyclictest0-21swapper/012:08:560
1074899372,22cyclictest13286-21/usr/sbin/munin12:25:000
1074899372,22cyclictest13286-21/usr/sbin/munin12:25:000
1074899371,23cyclictest30544-21interrupts11:35:210
15732360,5sleep0111rcuc/012:45:310
1074899357,5cyclictest81rcu_preempt11:45:200
1074899352,21cyclictest18648-21ssh09:42:280
10748993515,4cyclictest3-21ksoftirqd/009:13:480
1074899351,30cyclictest3150-21df_inode10:00:160
263712341,29sleep026438-21/usr/sbin/munin09:50:240
1074899342,5cyclictest0-21swapper/012:02:560
1074899341,4cyclictest81rcu_preempt10:55:130
10748993412,6cyclictest0-21swapper/012:40:350
1074899341,20cyclictest7405-21timerandwakeup09:30:270
1074899341,14cyclictest15927-21sh11:54:000
327622331,28sleep0308-21ssh11:04:460
30652331,28sleep03075-21iostat_ios11:40:240
1074899335,13cyclictest4591-21sshd09:28:070
1074899333,4cyclictest81rcu_preempt10:07:480
1074899333,26cyclictest22620-21tune2fs10:20:150
1074899332,28cyclictest0-21swapper/010:31:350
1074899332,15cyclictest15246-21/usr/sbin/munin09:00:110
1074899332,13cyclictest6788-21/usr/sbin/munin11:10:270
1074899331,30cyclictest0-21swapper/008:46:360
1074899331,30cyclictest0-21swapper/008:31:560
10748993312,9cyclictest0-21swapper/012:28:020
1074899331,14cyclictest15126-21runrttasks07:34:520
1074899329,12cyclictest27433-21uname08:05:210
10748993214,15cyclictest3-21ksoftirqd/010:52:000
1074899321,29cyclictest0-21swapper/009:36:550
1074899321,12cyclictest25792-21sort11:30:200
90102311,5sleep00-21swapper/008:41:060
189502311,26sleep018972-21munin-run07:45:000
18842310,4sleep0111rcuc/008:25:000
146972311,5sleep00-21swapper/011:19:260
117872310,3sleep011786-21cut08:50:150
1074899313,12cyclictest30497-21gdbus08:36:420
1074899311,4cyclictest81rcu_preempt12:32:290
1074899311,4cyclictest0-21swapper/011:06:160
1074899311,28cyclictest0-21swapper/010:19:360
10748993112,7cyclictest19610-21hddtemp_smartct07:45:160
10748993110,17cyclictest0-21swapper/010:38:520
198632301,5sleep00-21swapper/011:24:540
10748993017,10cyclictest3-21ksoftirqd/011:56:370
1074899301,4cyclictest81rcu_preempt09:59:470
321752291,5sleep00-21swapper/008:18:480
264952291,5sleep00-21swapper/008:03:130
1074899292,13cyclictest3302-21runrttasks07:52:370
10748992920,5cyclictest3-21ksoftirqd/008:55:230
10748992912,6cyclictest17110-21wget09:05:110
10748992910,6cyclictest2953-21/usr/sbin/munin08:25:250
10748992910,6cyclictest2953-21/usr/sbin/munin08:25:240
1074899281,14cyclictest30537-21chrt08:15:010
1074899279,5cyclictest15583-21cstates07:35:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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