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2026-08-27 - 01:27

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 Aug 26, 2026 12:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
76819912881236,32cyclictest6803-21memory10:10:221
76819911541144,7cyclictest0-21swapper/107:25:111
75712564517,32sleep00-21swapper/007:24:240
72992496450,31sleep10-21swapper/107:21:351
768099228221,4cyclictest0-21swapper/007:25:100
768099137113,21cyclictest0-21swapper/010:10:220
3007221170,2sleep130074-21basename12:40:011
292162930,3sleep0111rcuc/009:45:120
768199742,39cyclictest12648-21fschecks_count07:35:151
768199721,38cyclictest2618-21/usr/sbin/munin08:35:191
7681997115,41cyclictest10496-21iostat_ios10:20:191
768199711,38cyclictest15031-21taskset07:40:251
768199711,37cyclictest13288-21/usr/sbin/munin11:55:161
768199702,36cyclictest3286-21runrttasks10:02:181
768199692,31cyclictest18594-21ntp_states09:15:251
768199691,34cyclictest7994-21/usr/sbin/munin10:15:171
768199691,34cyclictest22724-21cut12:20:131
768199691,34cyclictest21784-21ls08:00:011
768199691,33cyclictest19428-21chrt07:52:481
768199683,34cyclictest2225-21dbus-daemon12:05:151
768199681,36cyclictest31965-21chrt11:16:421
768199681,34cyclictest18241-21ntp_offset10:40:221
768199681,34cyclictest18241-21ntp_offset10:40:221
768199681,33cyclictest526-21chrt12:45:261
768199681,33cyclictest27506-21cut09:40:161
768199681,33cyclictest22479-21chrt10:50:461
768199681,33cyclictest22365-21fschecks_time08:00:161
768199681,33cyclictest1757-21chrt09:56:481
768199681,33cyclictest12751-21chrt11:51:071
768199681,31cyclictest27103-21df11:05:131
768199672,33cyclictest4168-21df_inode11:30:131
768199672,32cyclictest1392-21memory08:30:211
768199672,31cyclictest5181-21iostat08:40:181
768199672,31cyclictest13945-21diskstats10:30:141
768199672,31cyclictest10524-21diskstats08:55:161
768199672,29cyclictest14600-21irqstats09:05:201
768199671,48cyclictest9536-21/usr/sbin/munin11:45:241
768199671,35cyclictest16685-21ntp_kernel_pll_09:10:211
768199671,34cyclictest19393-21aten_r4power_vo10:45:151
768199671,32cyclictest24862-21df12:25:121
768199671,31cyclictest27052-21iostat12:30:181
768199662,33cyclictest13916-21cat09:05:001
768199662,30cyclictest31620-21memory09:50:211
768199661,35cyclictest21489-21latency_hist09:25:011
768199661,34cyclictest12414-21grep10:25:221
768199661,33cyclictest30544-21latency_hist11:15:011
768199661,33cyclictest28347-21ntp_states08:15:251
768199661,33cyclictest16314-21/usr/sbin/munin10:35:241
768199661,32cyclictest30645-21tune2fs12:40:141
768199661,31cyclictest19533-21iostat_ios12:10:201
768199661,30cyclictest26329-21memory08:10:231
768199661,30cyclictest24238-21ntp_states09:30:231
768199661,29cyclictest7154-21/usr/sbin/munin08:45:201
768199661,29cyclictest2931-21rt-features11:25:251
768199661,29cyclictest25583-21diskstats09:35:151
768199651,33cyclictest32301-21sensors_temp08:25:271
768199651,33cyclictest23779-21aten_r4power_cu08:05:101
768199651,29cyclictest4841-21irqstats10:05:211
768199651,29cyclictest16551-21hddtemp_smartct07:45:171
768199642,31cyclictest15465-21df12:00:121
768199641,32cyclictest25481-21basename11:00:201
768199641,30cyclictest21642-21ntp_states12:15:241
768199641,29cyclictest9184-21ntp_states08:50:261
768199641,29cyclictest6053-21diskstats11:35:151
768199641,29cyclictest21934-21fschecks_time09:25:161
768199631,33cyclictest11632-21users07:30:291
768199621,31cyclictest30234-21ntp_offset08:20:231
768199601,29cyclictest32492-21cut11:20:101
768199591,32cyclictest29217-21cpuspeed_turbos09:45:131
768199581,39cyclictest9110-21chrt11:42:181
768199561,34cyclictest24758-21chrt10:59:591
768199551,33cyclictest1547-21chrt12:50:011
185962410,4sleep00-21swapper/009:15:250
126412400,3sleep00-21swapper/010:25:250
46042381,33sleep04591-21/usr/sbin/munin08:40:110
768099379,14cyclictest10132-21/usr/sbin/munin11:45:210
177652371,31sleep017880-21latency_hist07:50:010
7680993615,11cyclictest2401-21NetworkManager08:50:370
67612361,3sleep00-21swapper/008:45:140
768099352,21cyclictest31405-21ntp_states11:15:250
249892351,4sleep025124-21/usr/sbin/munin11:00:130
768099341,21cyclictest28689-21taskset09:42:570
768099341,20cyclictest31467-21ls09:50:180
768099341,17cyclictest31983-21needreboot12:45:010
768099336,5cyclictest81rcu_preempt07:35:120
7680993311,7cyclictest13132-21munin-run11:55:000
768099331,13cyclictest0-21swapper/009:33:250
7680993310,8cyclictest31975-21memory08:25:210
33762331,3sleep00-21swapper/012:55:000
92762321,5sleep00-21swapper/010:15:310
768099326,12cyclictest824-21cpu08:30:110
768099321,19cyclictest15528-21/usr/sbin/munin10:35:170
91632311,5sleep00-21swapper/011:42:540
768099319,6cyclictest5132-21grep11:30:270
768099318,5cyclictest5963-21munin-run10:10:000
768099312,16cyclictest15470-21df_inode12:00:130
213602311,5sleep00-21swapper/007:56:240
116002311,5sleep00-21swapper/008:56:280
768099309,6cyclictest27526-21missed_timers11:05:220
768099302,15cyclictest300-21diskstats11:20:150
768099301,4cyclictest81rcu_preempt08:11:400
7680993013,12cyclictest2999-21ls10:00:210
7680993011,6cyclictest19229-21diskstats12:10:150
7680993011,6cyclictest14870-21memory07:40:220
768099301,13cyclictest21883-21chrt08:00:040
768099301,10cyclictest28980-21df11:10:130
294092301,5sleep00-21swapper/008:20:090
222092301,5sleep00-21swapper/012:16:460
209172301,5sleep00-21swapper/010:49:010
155472301,5sleep00-21swapper/009:08:180
112492300,3sleep011251-21proc_pri07:30:250
768099293,4cyclictest81rcu_preempt11:28:010
768099292,13cyclictest28932-21iostat_ios12:35:190
768099291,14cyclictest28778-21users08:15:290
7680992910,10cyclictest0-21swapper/012:26:430
240422291,5sleep00-21swapper/012:21:040
229612291,5sleep00-21swapper/009:27:030
146462291,5sleep00-21swapper/011:56:190
135002291,5sleep00-21swapper/009:01:310
11802291,5sleep00-21swapper/012:47:530
98942281,5sleep00-21swapper/010:20:100
768099288,7cyclictest17893-21ntp_states12:05:240
768099283,4cyclictest81rcu_preempt09:21:170
768099282,13cyclictest6888-21ls11:35:290
768099282,13cyclictest0-21swapper/008:07:150
768099282,12cyclictest11564-21packagekitd12:30:190
768099281,14cyclictest18760-21ntp_states07:50:240
7680992810,6cyclictest23708-21/usr/sbin/munin10:55:200
7680992810,10cyclictest0-21swapper/009:37:120
224572281,5sleep00-21swapper/010:50:320
188662281,5sleep00-21swapper/010:42:150
188662281,5sleep00-21swapper/010:42:140
17062281,3sleep01707-21sshd09:56:150
149372281,5sleep00-21swapper/010:30:360
7680992711,5cyclictest17527-21runrttasks09:14:160
768099271,14cyclictest3387-21memory08:35:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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