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2026-07-29 - 21:08

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 376 highest latencies:
System rack9slot4s (updated Wed Jul 29, 2026 12:59:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
250709911601129,11cyclictest29584-21date07:35:001
248902693648,30sleep10-21swapper/107:23:421
247222689642,32sleep00-21swapper/007:21:570
25069999688,4cyclictest29507-21apt-get07:35:000
178492950,9sleep12507099cyclictest11:20:181
305872910,5sleep025067-21cyclictest11:55:010
130412830,8sleep02506999cyclictest09:40:230
156442580,8sleep12507099cyclictest11:15:111
2506999372,23cyclictest18877-21/usr/sbin/munin08:30:220
25070993424,6cyclictest1006-21/usr/sbin/munin10:35:181
2506999345,5cyclictest0-21swapper/009:45:160
2506999344,15cyclictest3286-21runrttasks12:10:250
2506999341,20cyclictest32624-21aten_r4power_po12:00:120
2506999341,20cyclictest32624-21aten_r4power_po12:00:120
228262341,29sleep022871-21/usr/sbin/munin08:40:290
167402341,4sleep116835-21hddtemp_smartct08:25:171
2507099332,16cyclictest8241-21hddtemp_smartct12:20:171
25070993217,9cyclictest22591-21iostat_ios08:40:221
2506999329,11cyclictest0-21swapper/009:05:290
25069993222,6cyclictest19797-21aten_r4power_en10:00:120
216222321,28sleep021623-21sshd08:38:070
133412321,5sleep00-21swapper/011:07:370
2507099315,4cyclictest81rcu_preempt08:45:231
2507099312,4cyclictest81rcu_preempt10:33:551
2507099312,4cyclictest81rcu_preempt10:33:541
2507099311,7cyclictest25227-21latency_hist10:15:011
2506999315,13cyclictest40250irq/92-i91510:35:170
2506999312,17cyclictest0-21swapper/010:52:400
25069993112,6cyclictest5868-21grep07:55:250
25069993111,6cyclictest16446-21ntp_states11:15:250
2506999311,15cyclictest11235-21/usr/sbin/munin08:10:180
104182311,4sleep110453-21ntp_states12:25:261
57802301,5sleep10-21swapper/110:47:111
43352301,5sleep00-21swapper/009:18:020
31632301,5sleep00-21swapper/007:50:110
2507099306,10cyclictest2225-21dbus-daemon11:28:511
2507099305,3cyclictest81rcu_preempt11:45:591
2507099302,4cyclictest81rcu_preempt08:03:571
25070993013,13cyclictest13743-21/usr/sbin/munin11:10:261
2506999302,15cyclictest0-21swapper/011:30:170
2506999302,14cyclictest0-21swapper/007:25:200
2506999302,13cyclictest2294-21df_inode12:05:130
2506999301,4cyclictest81rcu_preempt10:46:150
25069993012,6cyclictest7240-21diskstats08:00:160
25069993012,6cyclictest26116-21/usr/sbin/munin10:15:230
25069993012,5cyclictest27575-21df_inode10:20:130
2506999301,18cyclictest0-21swapper/012:45:120
2506999301,18cyclictest0-21swapper/012:45:110
2506999301,17cyclictest2225-21dbus-daemon08:08:400
2506999301,15cyclictest27620-21/usr/sbin/munin08:55:270
2506999300,4cyclictest81rcu_preempt11:45:200
248132301,5sleep10-21swapper/111:39:421
131192301,5sleep10-21swapper/112:34:011
122352301,5sleep10-21swapper/108:13:151
81072291,5sleep10-21swapper/109:28:031
310852291,5sleep10-21swapper/107:36:581
2507099297,9cyclictest0-21swapper/107:45:131
2507099295,4cyclictest81rcu_preempt11:01:161
2507099295,4cyclictest81rcu_preempt09:36:281
2507099292,4cyclictest81rcu_preempt10:16:411
25070992919,6cyclictest31122-21fschecks_time11:55:161
2507099291,4cyclictest81rcu_preempt09:49:021
25070992911,6cyclictest3286-21runrttasks08:56:531
2507099291,15cyclictest2695-21snmpd08:52:351
25070992911,14cyclictest14469-21/usr/sbin/munin08:20:261
2506999298,7cyclictest26635-21processes08:50:260
2506999293,13cyclictest0-21swapper/007:46:170
25069992919,6cyclictest23554-21wget10:10:110
2506999291,14cyclictest3689-21unixbench_singl10:40:270
25069992911,14cyclictest58372chrt12:15:020
25069992910,7cyclictest6758-21cat09:25:130
25069992910,6cyclictest8689-21ls09:30:130
25069992910,6cyclictest30551-21chrt09:00:280
245062291,5sleep00-21swapper/011:36:290
182212291,5sleep10-21swapper/108:30:121
179102291,5sleep00-21swapper/008:28:300
176662291,9sleep00-21swapper/009:54:460
99062281,5sleep10-21swapper/109:32:151
97372281,5sleep10-21swapper/110:59:191
64152281,5sleep10-21swapper/109:24:591
4762281,5sleep10-21swapper/109:08:171
45192281,5sleep10-21swapper/109:19:591
37852281,5sleep10-21swapper/110:40:581
35322281,5sleep10-21swapper/112:07:081
304412281,5sleep10-21swapper/111:54:231
25152281,5sleep10-21swapper/109:14:311
2507099286,12cyclictest40250irq/92-i91507:40:221
2507099285,4cyclictest81rcu_preempt09:57:581
2507099283,4cyclictest81rcu_preempt12:52:321
25070992819,5cyclictest22461-21unixbench_multi11:30:301
2506999289,6cyclictest8695-21irqstats10:55:200
2506999289,5cyclictest31600-21tr07:40:110
2506999284,11cyclictest0-21swapper/011:20:150
2506999282,19cyclictest19651-21iostat12:50:210
2506999282,13cyclictest31528-21latency_hist07:40:010
2506999282,13cyclictest2401-21NetworkManager10:31:410
2506999282,13cyclictest2401-21NetworkManager10:31:400
25069992818,6cyclictest3-21ksoftirqd/012:35:250
25069992815,7cyclictest8047-21diskstats12:20:150
25069992811,5cyclictest5370-21/usr/sbin/munin09:20:220
2506999281,14cyclictest30724-21cut11:55:110
2506999281,13cyclictest12955-21runrttasks12:32:170
25069992810,5cyclictest3286-21runrttasks08:49:000
2506999280,4cyclictest81rcu_preempt09:57:150
166902281,5sleep00-21swapper/012:41:590
144592281,3sleep10-21swapper/112:35:291
135112281,5sleep10-21swapper/109:40:311
134422281,5sleep10-21swapper/111:08:401
304892271,5sleep10-21swapper/110:26:021
268422271,5sleep10-21swapper/107:29:091
265932271,5sleep10-21swapper/111:43:251
2507099275,4cyclictest81rcu_preempt08:05:571
2507099273,4cyclictest81rcu_preempt07:56:241
2507099272,20cyclictest15875-21iostat_ios12:40:211
2507099272,15cyclictest0-21swapper/110:22:011
2507099271,4cyclictest81rcu_preempt08:19:031
2507099271,4cyclictest81rcu_preempt08:19:021
25070992711,4cyclictest40250irq/92-i91510:50:301
2507099271,13cyclictest5561-21taskset12:13:441
2506999275,5cyclictest14427-21memory11:10:240
25069992719,5cyclictest10772-21timerwakeupswit12:25:300
2506999271,6cyclictest2053-21grep09:10:310
2506999271,18cyclictest0-21swapper/010:25:460
233212271,5sleep10-21swapper/110:09:531
214702271,5sleep10-21swapper/108:36:331
16662271,5sleep10-21swapper/112:03:241
16662271,5sleep10-21swapper/112:03:231
2507099264,4cyclictest81rcu_preempt09:51:351
2507099261,11cyclictest3391-21grep07:50:141
2506999261,14cyclictest0-21swapper/011:00:430
2506999261,13cyclictest13160-21iostat08:15:190
2506999261,13cyclictest13160-21iostat08:15:180
2506999261,12cyclictest11162-21grep09:35:260
2507099255,9cyclictest30846-21cron09:01:011
25070992516,6cyclictest22-21ksoftirqd/112:16:241
2506999257,10cyclictest0-21swapper/011:28:070
2506999255,11cyclictest0-21swapper/008:21:350
2507099241,9cyclictest17194-21/usr/sbin/munin12:45:121
2507099241,9cyclictest17194-21/usr/sbin/munin12:45:111
2507099241,19cyclictest0-21swapper/110:00:171
2506999247,6cyclictest22975-21runrttasks10:06:140
2506999241,6cyclictest26552-21cron11:43:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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