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2026-06-01 - 10:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, slot #5

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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rackaslot5s.osadl.org (updated Mon Jun 01, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81810,0rcu_preempt27355-1kworker/1:2H23:28:021
81810,0rcu_preempt19-21ksoftirqd/100:22:451
81760,0rcu_preempt19-21ksoftirqd/122:22:391
81760,0rcu_preempt17511-1kworker/1:0H22:10:521
81750,0rcu_preempt19-21ksoftirqd/122:13:121
81690,0rcu_preempt19-21ksoftirqd/100:13:001
81680,0rcu_preempt19-21ksoftirqd/122:42:301
81670,0rcu_preempt19-21ksoftirqd/122:07:461
81670,0rcu_preempt19-21ksoftirqd/122:07:461
10050670,0irq/346-484840054-21kswapd023:45:230
81640,0rcu_preempt19-21ksoftirqd/123:52:171
10050640,0irq/346-484840030058-1kworker/0:0H21:51:490
81630,0rcu_preempt3-21ksoftirqd/000:22:230
81630,0rcu_preempt19-21ksoftirqd/123:23:011
81630,0rcu_preempt19-21ksoftirqd/123:23:011
81630,0rcu_preempt18140-1kworker/0:1H19:22:110
81620,0rcu_preempt19-21ksoftirqd/123:02:571
81620,0rcu_preempt19-21ksoftirqd/122:44:331
81620,0rcu_preempt19-21ksoftirqd/100:28:021
81610,0rcu_preempt19-21ksoftirqd/123:12:551
81590,0rcu_preempt23666-21kworker/0:119:48:030
81590,0rcu_preempt19-21ksoftirqd/122:57:571
81580,0rcu_preempt9950irq/345-484840021:49:491
81580,0rcu_preempt3-21ksoftirqd/023:58:160
10050580,0irq/346-484840028410-21meminfo22:53:091
81570,0rcu_preempt3-21ksoftirqd/023:33:080
81570,0rcu_preempt3-21ksoftirqd/022:09:310
81570,0rcu_preempt19-21ksoftirqd/100:36:291
81560,0rcu_preempt3-21ksoftirqd/020:13:070
81560,0rcu_preempt3-21ksoftirqd/019:52:550
13468995618,0cyclictest0-21swapper/021:32:560
81550,0rcu_preempt8348-21diskstats21:28:010
81550,0rcu_preempt3-21ksoftirqd/021:43:120
81550,0rcu_preempt3-21ksoftirqd/021:08:430
81550,0rcu_preempt22826-21ssh22:14:520
81550,0rcu_preempt19-21ksoftirqd/121:53:161
13468995519,0cyclictest21126-21runrttasks23:51:200
13468995517,0cyclictest22761-21apt-get22:47:570
13468995517,0cyclictest13165-21ssh00:16:550
13468995515,0cyclictest26043-21fschecks_time21:13:060
13468995514,0cyclictest0-21swapper/022:59:580
81540,0rcu_preempt3-21ksoftirqd/023:53:060
81540,0rcu_preempt3-21ksoftirqd/023:38:140
81540,0rcu_preempt3-21ksoftirqd/023:23:130
81540,0rcu_preempt3-21ksoftirqd/023:23:130
81540,0rcu_preempt3-21ksoftirqd/021:53:080
81540,0rcu_preempt3-21ksoftirqd/000:23:060
81540,0rcu_preempt29699-21ping20:02:460
81540,0rcu_preempt22031-21df_inode19:33:011
81540,0rcu_preempt19-21ksoftirqd/123:32:581
81540,0rcu_preempt19-21ksoftirqd/100:08:081
81540,0rcu_preempt19129-21ssh00:22:571
10050540,0irq/346-484840030815-1kworker/0:0H00:37:160
81530,0rcu_preempt3-21ksoftirqd/022:29:420
81530,0rcu_preempt3-21ksoftirqd/021:23:070
81530,0rcu_preempt3-21ksoftirqd/020:47:580
81530,0rcu_preempt19-21ksoftirqd/120:58:021
13468995314,0cyclictest19996-1kworker/0:1H22:47:330
81520,0rcu_preempt3-21ksoftirqd/022:37:500
81520,0rcu_preempt3-21ksoftirqd/022:18:120
81520,0rcu_preempt3-21ksoftirqd/000:27:550
81520,0rcu_preempt3-21ksoftirqd/000:07:460
13468995218,0cyclictest2365-21ssh21:22:010
13468995216,0cyclictest14831-1kworker/0:2H19:12:450
13468995216,0cyclictest12312-21ssh22:04:060
13468995216,0cyclictest12312-21ssh22:04:060
81510,0rcu_preempt3-21ksoftirqd/021:38:050
81510,0rcu_preempt3-21ksoftirqd/020:08:000
81510,0rcu_preempt19-21ksoftirqd/123:08:081
81510,0rcu_preempt19-21ksoftirqd/121:27:581
81510,0rcu_preempt19-21ksoftirqd/120:08:091
13468995122,0cyclictest2619-1kworker/0:2H21:57:590
13468995115,0cyclictest15434-21sh19:13:000
13468995115,0cyclictest15434-21sh19:13:000
10050510,0irq/346-4848400851-21rngd00:02:490
10050510,0irq/346-48484001339-21snmpd23:53:481
81500,0rcu_preempt851-21rngd20:47:200
81500,0rcu_preempt3-21ksoftirqd/022:23:050
13468995020,0cyclictest30015-21apt-get23:27:560
13468995016,0cyclictest23025-21taskset23:20:260
13468995010,0cyclictest0-21swapper/023:10:050
81490,0rcu_preempt3-21ksoftirqd/023:03:140
81490,0rcu_preempt3-21ksoftirqd/020:53:090
81490,0rcu_preempt3-21ksoftirqd/019:58:200
13468994919,0cyclictest28416-21meminfo22:53:100
10050490,0irq/346-484840032710-1kworker/1:4H21:23:041
81480,0rcu_preempt7472-21apt-get20:27:560
81480,0rcu_preempt3-21ksoftirqd/023:13:070
81480,0rcu_preempt3-21ksoftirqd/022:33:090
81480,0rcu_preempt18058-21ps20:58:090
9950470,0irq/345-4848400851-21rngd21:20:451
81470,0rcu_preempt3-21ksoftirqd/020:40:580
81470,0rcu_preempt23011-21ssh21:42:571
81470,0rcu_preempt19-21ksoftirqd/119:03:081
13468994720,0cyclictest16753-21ping19:37:570
10050470,0irq/346-484840023484-21ssh23:21:021
81460,0rcu_preempt3-21ksoftirqd/019:03:070
81460,0rcu_preempt19-21ksoftirqd/119:27:561
13468994514,0cyclictest4394-21dropbear20:18:030
10050450,0irq/346-48484007574-21ssh22:32:451
81440,0rcu_preempt20848-21kworker/1:119:07:541
81440,0rcu_preempt19-21ksoftirqd/122:37:461
81440,0rcu_preempt19-21ksoftirqd/120:17:591
81440,0rcu_preempt12404-21apt-get20:42:561
81440,0rcu_preempt0-21swapper/120:27:561
10050440,0irq/346-48484006205-21meminfo21:58:101
81430,0rcu_preempt54-21kswapd023:37:561
81430,0rcu_preempt3-21ksoftirqd/020:33:060
81430,0rcu_preempt29699-21ping19:58:171
81430,0rcu_preempt29422-21users19:53:121
81430,0rcu_preempt26533-21awk21:13:131
81430,0rcu_preempt19-21ksoftirqd/123:57:581
81430,0rcu_preempt16753-21ping19:38:171
81430,0rcu_preempt13432-21processes23:43:111
81430,0rcu_preempt0-21swapper/121:02:581
13468994319,0cyclictest29699-21ping20:22:570
13468994318,0cyclictest16753-21ping19:42:570
13468994318,0cyclictest16753-21ping19:32:570
13468994313,0cyclictest0-21swapper/021:03:050
9950420,0irq/345-48484003854-21date00:07:461
81420,0rcu_preempt3-21ksoftirqd/019:23:160
81420,0rcu_preempt27328-21meminfo19:48:081
81420,0rcu_preempt19-21ksoftirqd/121:38:111
81420,0rcu_preempt19-21ksoftirqd/120:13:111
81420,0rcu_preempt19-21ksoftirqd/120:07:461
81420,0rcu_preempt19-21ksoftirqd/119:22:571
81420,0rcu_preempt19-21ksoftirqd/119:18:151
81420,0rcu_preempt16753-21ping19:44:111
81410,0rcu_preempt23583-21ntpq22:48:111
81410,0rcu_preempt19-21ksoftirqd/122:24:101
81410,0rcu_preempt19-21ksoftirqd/121:36:041
81410,0rcu_preempt19-21ksoftirqd/121:12:011
81410,0rcu_preempt13467-21cyclictest20:23:011
81410,0rcu_preempt0-21swapper/120:38:051
81400,0rcu_preempt0-21swapper/119:13:121
81400,0rcu_preempt0-21swapper/119:13:121
81390,0rcu_preempt3-21ksoftirqd/019:28:190
81390,0rcu_preempt19-21ksoftirqd/120:53:101
81390,0rcu_preempt19-21ksoftirqd/120:32:551
81380,0rcu_preempt19-21ksoftirqd/120:48:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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