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2026-08-21 - 18:35

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 Fri Aug 21, 2026 12:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
199719912601239,18cyclictest0-21swapper/107:25:111
199719911011083,15cyclictest0-21swapper/109:20:001
196582643596,31sleep10-21swapper/107:22:181
197562622554,52sleep00-21swapper/007:23:210
1997099259222,20cyclictest0-21swapper/009:20:010
1997099207173,31cyclictest0-21swapper/007:25:100
194272940,8sleep11997199cyclictest10:10:271
19970996210,6cyclictest11928-21awk12:45:010
19970995923,6cyclictest27442-21/usr/sbin/munin07:40:250
1997099592,27cyclictest21836-21munin-node11:45:110
19970995910,12cyclictest18778-21/usr/sbin/munin08:45:140
1997099584,14cyclictest2225-21dbus-daemon11:10:450
1997099582,12cyclictest8291-21munin-node12:35:090
1997099574,18cyclictest24007-21diskstats11:50:150
1997099573,17cyclictest15304-21diskstats08:35:150
19970995711,5cyclictest0-21swapper/011:00:110
1997099564,17cyclictest1309-21diskstats10:50:140
1997099561,14cyclictest28829-21grep09:10:200
1997099561,14cyclictest28829-21grep09:10:200
19970995610,7cyclictest0-21swapper/009:02:050
1997099552,15cyclictest30509-21diskstats07:50:140
1997099549,5cyclictest10050irq/91-xhci_hcd11:35:190
1997099543,17cyclictest392-21users10:45:290
50062530,5sleep1211ktimersoftd/112:25:141
1997099539,7cyclictest29642-21df12:05:140
1997099532,19cyclictest12725-21diskstats11:20:150
1997099532,14cyclictest22484-21df10:20:130
1997099532,14cyclictest0-21swapper/009:59:150
1997099532,14cyclictest0-21swapper/009:59:150
1997099532,14cyclictest0-21swapper/008:44:530
1997099531,19cyclictest6134-21proc_pri09:35:250
1997099522,7cyclictest12159-21/usr/sbin/munin09:50:280
1997099522,13cyclictest2225-21dbus-daemon08:26:470
1997099522,13cyclictest0-21swapper/008:10:280
1997099521,12cyclictest31322-21taskset10:43:520
1997099512,15cyclictest7436-21df_inode09:40:150
1997099512,12cyclictest4217-21hddtemp_smartct08:05:170
1997099511,13cyclictest17402-21awk11:30:280
1997099511,12cyclictest11276-21grep11:15:210
19970995110,6cyclictest20553-21iostat11:40:190
1997099508,6cyclictest2225-21dbus-daemon10:17:200
1997099502,13cyclictest458-21ntp_states07:55:260
19970995011,5cyclictest28314-21/usr/sbin/munin10:35:170
1997099501,13cyclictest15266-21iostat_ios10:00:200
1997099492,14cyclictest0-21swapper/010:27:230
1997099492,13cyclictest20955-21diskstats08:50:150
1997099492,12cyclictest23000-21perl08:55:160
1997099492,12cyclictest0-21swapper/008:00:260
1997099491,12cyclictest3607-21iostat_ios10:55:200
1997099482,14cyclictest0-21swapper/012:22:140
1997099481,24cyclictest7931-21cron12:32:590
1997099481,13cyclictest26904-21mailstats10:30:250
1997099481,10cyclictest0-21swapper/012:12:340
1997099472,15cyclictest0-21swapper/009:15:520
1997099472,13cyclictest1683-21/usr/sbin/munin12:15:270
1997099472,13cyclictest10033-21python09:45:280
1997099471,13cyclictest18259-21sh10:09:590
1997099461,13cyclictest26187-21/usr/sbin/munin11:55:230
1997099461,13cyclictest2225-21dbus-daemon08:32:320
1997099452,13cyclictest3660-21df09:30:130
1997099451,14cyclictest2401-21NetworkManager09:29:410
1997099451,14cyclictest19169-21grep10:10:220
19971993813,5cyclictest134262diskstats08:30:141
1997099341,21cyclictest28560-21expr07:45:130
276732331,28sleep127766-21df12:00:141
259832331,28sleep126079-21hddtemp_smartct11:55:191
104962331,28sleep110665-21fschecks_time12:40:161
132872321,27sleep113361-21iostat09:55:171
132872321,27sleep113361-21iostat09:55:171
1997199314,20cyclictest26547-21iostat_ios10:30:191
1997199313,4cyclictest40250irq/92-i91508:40:131
1997199311,9cyclictest1621-21irqstats10:50:201
19971993117,8cyclictest6710-21diskstats12:30:141
19970993112,5cyclictest3286-21runrttasks07:39:390
43492301,5sleep10-21swapper/110:56:101
21912301,5sleep10-21swapper/112:18:031
1997199304,17cyclictest0-21swapper/112:39:591
19971993019,7cyclictest22433-21iostat_ios11:45:211
1997199301,13cyclictest0-21swapper/108:38:161
1997099301,4cyclictest81rcu_preempt12:54:590
1997099301,4cyclictest81rcu_preempt09:05:380
153082301,5sleep10-21swapper/112:51:081
5202291,5sleep10-21swapper/110:46:381
319022291,5sleep10-21swapper/107:54:471
290962290,5sleep129095-21needreboot07:45:231
219782291,5sleep10-21swapper/108:50:591
1997199295,4cyclictest81rcu_preempt11:18:061
1997199295,4cyclictest81rcu_preempt11:09:161
1997199295,4cyclictest81rcu_preempt08:45:551
1997199295,4cyclictest81rcu_preempt07:33:331
1997199294,4cyclictest81rcu_preempt09:18:331
1997199293,4cyclictest81rcu_preempt09:29:011
1997199292,4cyclictest81rcu_preempt10:35:071
1997199291,9cyclictest18279-21munin-run10:10:001
1997099296,10cyclictest10053-21latency08:20:200
1997099292,15cyclictest0-21swapper/011:25:580
19970992911,6cyclictest8649-21/usr/sbin/munin08:15:290
1997099291,14cyclictest12130-21aten_r4power_en12:45:110
1997099290,4cyclictest81rcu_preempt12:28:120
139002291,5sleep10-21swapper/111:22:321
128372291,5sleep10-21swapper/108:28:411
106862291,5sleep10-21swapper/108:20:501
68272281,5sleep10-21swapper/109:38:411
326762281,5sleep10-21swapper/112:12:141
320852281,5sleep10-21swapper/107:55:071
254312281,5sleep10-21swapper/110:26:201
249982281,5sleep10-21swapper/111:50:381
219192281,5sleep10-21swapper/110:19:021
1997199289,5cyclictest6120-21sed11:00:271
1997199286,4cyclictest81rcu_preempt09:00:571
1997199284,16cyclictest0-21swapper/112:23:411
1997199283,4cyclictest81rcu_preempt08:17:421
1997199282,10cyclictest12159-21users09:50:281
1997199281,5cyclictest81rcu_preempt11:34:481
1997199281,4cyclictest81rcu_preempt08:11:341
1997199280,4cyclictest81rcu_preempt08:01:471
1997099282,17cyclictest0-21swapper/011:05:120
19970992810,5cyclictest27636-21/usr/sbin/munin12:00:120
156822281,5sleep10-21swapper/111:26:331
136972281,5sleep10-21swapper/112:48:551
100192281,5sleep10-21swapper/111:11:261
86252271,5sleep10-21swapper/109:42:381
51212271,4sleep10-21swapper/108:06:431
310212271,5sleep10-21swapper/110:40:441
309432271,5sleep10-21swapper/112:08:441
294952271,5sleep10-21swapper/109:10:501
294952271,5sleep10-21swapper/109:10:491
279812271,5sleep10-21swapper/109:09:411
258752271,5sleep10-21swapper/107:35:491
236512271,5sleep10-21swapper/110:22:191
1997199274,4cyclictest81rcu_preempt08:56:431
1997199272,4cyclictest81rcu_preempt09:46:211
19971992716,7cyclictest4177-21ntpq09:30:231
1997199271,22cyclictest14670-21/usr/sbin/munin10:00:301
197422271,5sleep10-21swapper/111:39:451
1997099269,5cyclictest23336-21runrttasks07:30:200
19971992516,6cyclictest22-21ksoftirqd/111:40:201
1997199241,9cyclictest27270-21/usr/sbin/munin07:40:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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