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2026-06-10 - 21:06

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 100 highest latencies:
System rack9slot4s (updated Wed Jun 10, 2026 12:59:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
84789911251081,40cyclictest9084-21perl07:25:160
84799910851071,11cyclictest0-21swapper/107:25:151
82422680633,32sleep10-21swapper/107:23:071
83182552507,30sleep00-21swapper/007:23:540
110042850,7sleep1847999cyclictest08:55:011
847899392,13cyclictest81rcu_preempt09:10:050
847899392,13cyclictest81rcu_preempt09:10:050
293302361,30sleep029351-21munin-run11:10:000
241072360,2sleep024108-21cat09:30:010
172762331,28sleep117341-21smartctl10:35:271
172762331,28sleep117341-21smartctl10:35:271
8479993223,5cyclictest22-21ksoftirqd/111:52:231
8479993223,5cyclictest22-21ksoftirqd/110:00:581
8479993222,6cyclictest22-21ksoftirqd/111:00:361
8479993222,6cyclictest22-21ksoftirqd/110:45:081
847899323,14cyclictest18122-21timerandwakeup07:45:310
262102321,4sleep125380-21/usr/sbin/munin12:25:231
156212321,4sleep115631-21ntp_states09:05:241
156212321,4sleep115631-21ntp_states09:05:231
8479993123,5cyclictest22-21ksoftirqd/110:56:171
8479993121,6cyclictest22-21ksoftirqd/108:26:221
8479993121,6cyclictest22-21ksoftirqd/108:26:221
8479993118,7cyclictest28277-21diskstats09:40:141
8479993115,12cyclictest22-21ksoftirqd/110:22:231
847899319,6cyclictest288042chrt12:33:190
847899316,15cyclictest7109-21cron08:45:000
847899311,4cyclictest81rcu_preempt07:34:350
847899311,14cyclictest28779-21ntpdc09:40:220
70912311,5sleep10-21swapper/108:44:531
251182311,5sleep10-21swapper/112:24:021
23712311,26sleep12400-21aten_r4power_en12:50:091
126682311,5sleep10-21swapper/108:59:141
8479993022,5cyclictest22-21ksoftirqd/112:36:411
8479993022,5cyclictest22-21ksoftirqd/109:52:121
8479993022,5cyclictest22-21ksoftirqd/109:33:441
8479993022,5cyclictest22-21ksoftirqd/108:01:231
8479993021,6cyclictest22-21ksoftirqd/110:41:241
8479993021,6cyclictest22-21ksoftirqd/109:56:351
8479993021,5cyclictest22-21ksoftirqd/108:14:131
8479993020,6cyclictest22-21ksoftirqd/109:22:031
8479993020,6cyclictest22-21ksoftirqd/108:21:051
847899304,19cyclictest32560-21ntp_states09:50:230
847899302,4cyclictest81rcu_preempt11:16:280
847899302,17cyclictest0-21swapper/009:05:260
847899302,17cyclictest0-21swapper/009:05:250
847899301,4cyclictest81rcu_preempt08:16:040
8478993011,6cyclictest24843-21df08:05:130
75622301,4sleep17566-21diskstats08:45:141
85682291,5sleep00-21swapper/008:45:400
8479992921,5cyclictest22-21ksoftirqd/109:45:581
8479992920,6cyclictest22-21ksoftirqd/110:06:591
8479992919,6cyclictest22-21ksoftirqd/111:07:161
8479992916,7cyclictest24859-21diskstats08:05:151
847899299,7cyclictest24234-21wget09:30:090
847899296,6cyclictest20518-21seq07:53:550
847899293,4cyclictest81rcu_preempt10:40:440
847899293,4cyclictest81rcu_preempt08:34:300
847899293,17cyclictest19580-21munin-run12:10:010
847899292,13cyclictest831-21grep08:25:280
847899292,13cyclictest831-21grep08:25:280
847899291,4cyclictest81rcu_preempt11:54:220
847899291,4cyclictest81rcu_preempt11:04:560
847899291,4cyclictest81rcu_preempt10:17:550
847899291,4cyclictest81rcu_preempt10:02:460
847899291,4cyclictest81rcu_preempt09:24:200
847899291,4cyclictest81rcu_preempt08:22:080
847899291,4cyclictest81rcu_preempt07:42:280
847899291,4cyclictest81rcu_preempt07:36:070
8478992912,5cyclictest9979-21ntp_states08:50:230
8478992910,14cyclictest236292chrt10:54:260
847899290,3cyclictest81rcu_preempt11:37:020
82862291,5sleep00-21swapper/010:11:300
81332291,5sleep10-21swapper/111:38:371
221192291,5sleep10-21swapper/107:56:021
170262291,4sleep10-21swapper/107:45:031
146992291,5sleep10-21swapper/107:39:041
143622291,5sleep00-21swapper/009:02:090
138602291,5sleep00-21swapper/010:25:350
100862291,5sleep10-21swapper/110:15:381
8479992820,5cyclictest22-21ksoftirqd/112:07:231
8479992819,6cyclictest22-21ksoftirqd/112:15:491
8479992819,5cyclictest22-21ksoftirqd/109:19:301
847999281,23cyclictest269342sleep109:35:251
847999281,23cyclictest10946-21hddtemp_smartct07:30:051
8479992810,14cyclictest22947-21kernelversion09:25:191
8479992810,14cyclictest157862chrt10:31:061
847899281,4cyclictest81rcu_preempt09:35:120
847899281,4cyclictest81rcu_preempt09:17:280
8478992811,4cyclictest3286-21runrttasks10:32:420
8478992811,14cyclictest0-21swapper/012:02:170
50412281,5sleep10-21swapper/108:38:151
49742281,5sleep00-21swapper/008:37:340
307752281,5sleep00-21swapper/011:10:310
30602281,5sleep10-21swapper/108:32:161
296402281,5sleep10-21swapper/108:16:011
267282281,4sleep00-21swapper/012:26:130
251692281,5sleep00-21swapper/010:55:570
247672281,5sleep00-21swapper/012:20:290
224742281,5sleep00-21swapper/007:59:450
204222281,5sleep10-21swapper/107:52:581
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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