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2026-09-02 - 14:03

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 792 highest latencies:
System rack9slot4s (updated Wed Sep 02, 2026 00:59:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
176079912201195,21cyclictest30881-21unixbench_singl19:55:321
176069912071162,32cyclictest3286-21runrttasks19:25:060
176079911741165,6cyclictest0-21swapper/119:25:091
171332546444,33sleep00-21swapper/019:20:360
174742455370,70sleep10-21swapper/119:24:111
1760699169149,15cyclictest0-21swapper/019:55:320
45852930,3sleep14581-21ntp_kernel_pll_00:30:241
186492880,4sleep129536-21kworker/1:423:41:001
221772810,9sleep11760799cyclictest22:25:231
124962710,4sleep01760699cyclictest22:00:170
17606993916,7cyclictest6143-21hddtemp_smartct00:35:170
17606993710,10cyclictest1476-21grep22:55:280
17606993513,11cyclictest464-21munin-run21:30:000
17606993513,11cyclictest464-21munin-run21:30:000
1760699351,15cyclictest0-21swapper/021:33:290
277282341,4sleep027771-21/usr/sbin/munin00:05:280
17607993423,7cyclictest12167-21/usr/sbin/munin00:50:231
17607993316,13cyclictest22-21ksoftirqd/122:45:511
1760699338,13cyclictest14887-21kernelversion20:40:220
238232321,27sleep023664-21/usr/sbin/munin21:05:120
1760699324,13cyclictest2225-21dbus-daemon22:08:530
1760699321,4cyclictest81rcu_preempt22:43:590
17606993212,6cyclictest28889-21df_inode00:10:160
17606993212,5cyclictest24629-21iostat_ios19:40:200
1760799314,4cyclictest81rcu_preempt19:37:331
1760799311,9cyclictest22776-21cat23:54:551
1760699317,12cyclictest81rcu_preempt19:35:290
17606993113,5cyclictest26563-21munin-run00:05:010
1760699311,12cyclictest45812ntp_kernel_pll_00:30:240
116682311,3sleep10-21swapper/123:25:101
324662301,5sleep10-21swapper/122:54:101
324622301,5sleep00-21swapper/022:54:070
217842301,5sleep10-21swapper/121:00:071
1760799305,4cyclictest81rcu_preempt21:46:121
1760799304,4cyclictest81rcu_preempt23:46:371
1760799304,4cyclictest81rcu_preempt23:21:371
1760799304,4cyclictest81rcu_preempt00:23:341
1760799301,4cyclictest81rcu_preempt23:33:571
1760799301,4cyclictest81rcu_preempt22:39:251
17607993014,13cyclictest22-21ksoftirqd/119:52:531
1760799301,26cyclictest0-21swapper/122:10:201
1760799301,26cyclictest0-21swapper/122:10:191
1760799301,12cyclictest0-21swapper/120:12:341
1760699309,18cyclictest11565-21gdbus20:00:130
1760699305,8cyclictest0-21swapper/020:15:160
1760699302,15cyclictest29252-21df_inode22:45:160
1760699302,15cyclictest0-21swapper/020:27:490
1760699302,14cyclictest28470-21memory19:50:210
1760699301,4cyclictest81rcu_preempt20:55:390
1760699301,15cyclictest17816-21hddtemp_smartct23:40:170
1760699301,13cyclictest26712-21grep21:10:280
174762301,5sleep00-21swapper/022:14:530
174762301,5sleep00-21swapper/022:14:530
166852300,8sleep01760699cyclictest23:35:300
137172301,5sleep10-21swapper/122:04:491
89332291,5sleep00-21swapper/000:41:400
82192291,5sleep10-21swapper/120:22:391
73262291,5sleep00-21swapper/023:10:510
307252291,5sleep00-21swapper/021:21:490
290982291,5sleep10-21swapper/121:19:391
252172291,5sleep10-21swapper/121:08:231
246042291,5sleep10-21swapper/122:30:411
233352291,5sleep00-21swapper/021:03:170
210052291,5sleep00-21swapper/022:22:130
176662291,5sleep00-21swapper/020:48:020
176662291,5sleep00-21swapper/020:48:010
1760799299,6cyclictest0-21swapper/121:11:541
1760799297,13cyclictest40250irq/92-i91520:50:241
1760799296,3cyclictest81rcu_preempt23:59:071
1760799294,4cyclictest81rcu_preempt00:43:291
1760799293,4cyclictest81rcu_preempt23:11:271
1760799293,4cyclictest81rcu_preempt00:16:181
1760799293,13cyclictest5278-21cut20:15:161
17607992919,6cyclictest16426-21/usr/sbin/munin20:45:141
17607992919,6cyclictest16426-21/usr/sbin/munin20:45:141
17607992916,10cyclictest22-21ksoftirqd/122:57:171
1760799291,4cyclictest81rcu_preempt21:42:011
17607992913,13cyclictest22-21ksoftirqd/120:56:411
17607992911,6cyclictest5192chrt20:02:001
1760699298,5cyclictest12388-21wget20:35:100
1760699292,23cyclictest25776-21iostat22:35:190
1760699292,15cyclictest0-21swapper/023:55:090
1760699292,14cyclictest13838-21df_inode23:30:140
1760699292,13cyclictest7168-21/usr/sbin/munin21:45:250
1760699292,13cyclictest23422-21grep22:30:120
1760699291,15cyclictest5323-21/usr/sbin/munin21:40:230
1760699291,15cyclictest21277-21/usr/sbin/munin19:30:280
17606992911,5cyclictest19695-21hddtemp_smartct23:45:180
1760699291,15cyclictest10966-21ntpq21:55:260
1760699291,14cyclictest2156-21fschecks_count00:25:150
1760699291,13cyclictest3681-21seq23:01:560
17606992910,5cyclictest27324-21taskset19:46:570
1760699290,3cyclictest81rcu_preempt23:26:250
119082291,5sleep00-21swapper/020:31:580
111602291,5sleep10-21swapper/100:49:541
107532291,5sleep00-21swapper/000:45:400
98962281,4sleep00-21swapper/021:54:180
96392281,5sleep10-21swapper/121:51:411
54692281,5sleep00-21swapper/023:06:000
309052281,5sleep10-21swapper/121:23:411
290802281,5sleep00-21swapper/021:19:280
219052281,5sleep10-21swapper/119:34:191
211112281,5sleep10-21swapper/122:23:211
1760799289,6cyclictest3286-21runrttasks23:00:181
1760799285,4cyclictest81rcu_preempt00:07:401
1760799285,4cyclictest81rcu_preempt00:04:531
1760799284,10cyclictest81rcu_preempt00:10:121
1760799281,14cyclictest24033-21/usr/sbin/munin19:40:301
1760699289,6cyclictest1266-21diskstats20:05:140
1760699284,11cyclictest10013-21cstates23:20:120
17606992813,12cyclictest0-21swapper/022:15:310
1760699281,14cyclictest8579-21/usr/sbin/munin23:15:220
1760699281,14cyclictest7752-21python20:20:280
17606992810,6cyclictest3793-21ntp_states20:10:260
149922281,5sleep10-21swapper/120:40:251
139722281,5sleep10-21swapper/120:38:571
100612281,5sleep10-21swapper/120:27:191
78902271,5sleep10-21swapper/123:15:111
39472271,5sleep10-21swapper/121:36:101
34632271,5sleep10-21swapper/100:28:271
284862271,5sleep10-21swapper/122:41:491
1760799274,4cyclictest81rcu_preempt20:30:141
1760799273,4cyclictest81rcu_preempt20:09:141
1760799272,4cyclictest81rcu_preempt19:49:511
1760799272,11cyclictest4740-21iostat_ios23:05:201
17607992717,6cyclictest617-21cut21:30:111
1760799271,6cyclictest16364-21sendmail_mailqu23:35:261
1760699279,6cyclictest21652-21/usr/sbin/munin23:50:180
1760699271,14cyclictest12897-21chrt00:53:240
1760699271,13cyclictest32668-21/usr/sbin/munin00:20:150
17606992710,5cyclictest21439-21munin-node22:25:110
17606992710,13cyclictest111rcuc/021:36:570
101232271,4sleep10-21swapper/121:55:081
194512261,5sleep00-21swapper/020:52:050
193042261,5sleep10-21swapper/122:19:171
1760799262,10cyclictest0-21swapper/100:36:431
1760799261,4cyclictest81rcu_preempt21:26:161
1760799261,4cyclictest81rcu_preempt21:26:151
1760699261,13cyclictest30653-21cpuspeed_turbos00:15:130
1760799256,16cyclictest3286-21runrttasks22:05:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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