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2026-05-11 - 13:14

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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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 May 11, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81970,0rcu_preempt3-21ksoftirqd/022:38:190
81880,0rcu_preempt3-21ksoftirqd/023:07:540
81720,0rcu_preempt3-21ksoftirqd/023:43:360
81710,0rcu_preempt3-21ksoftirqd/020:43:300
81710,0rcu_preempt3-21ksoftirqd/020:13:340
81700,0rcu_preempt3-21ksoftirqd/023:33:290
81700,0rcu_preempt16409-21diskmemload23:08:220
81690,0rcu_preempt3-21ksoftirqd/022:58:270
81660,0rcu_preempt3-21ksoftirqd/022:51:570
81660,0rcu_preempt12766-21kworker/0:021:43:160
81650,0rcu_preempt3-21ksoftirqd/019:13:280
81650,0rcu_preempt18770-1kworker/0:4H22:18:360
10050650,0irq/346-484840098932sleep122:06:421
81630,0rcu_preempt17592-21kworker/u4:022:33:300
81620,0rcu_preempt3-21ksoftirqd/023:54:250
10050620,0irq/346-484840011302-21aten_rapower_po22:08:181
81610,0rcu_preempt3-21ksoftirqd/023:48:200
81610,0rcu_preempt24524-21df_inode19:53:210
81610,0rcu_preempt19-21ksoftirqd/119:37:081
10050610,0irq/346-484840054-21kswapd023:48:091
10050610,0irq/346-484840054-21kswapd023:31:180
81600,0rcu_preempt3-21ksoftirqd/022:53:550
81600,0rcu_preempt3-21ksoftirqd/021:58:570
81600,0rcu_preempt3-21ksoftirqd/020:28:250
81600,0rcu_preempt3-21ksoftirqd/020:08:250
81600,0rcu_preempt22908-21apt-get23:58:170
81590,0rcu_preempt3-21ksoftirqd/020:38:290
81590,0rcu_preempt3-21ksoftirqd/000:03:190
10050590,0irq/346-484840054-21kswapd023:57:111
941599579,0cyclictest0-21swapper/022:08:310
81570,0rcu_preempt6971-21kworker/0:200:18:160
81570,0rcu_preempt3-21ksoftirqd/021:03:310
81570,0rcu_preempt3-21ksoftirqd/000:17:090
10050570,0irq/346-484840054-21kswapd021:16:371
10050570,0irq/346-484840022975-1kworker/1:3H22:22:121
10050570,0irq/346-484840017330-1kworker/1:2H00:27:551
9950560,0irq/345-484840030988-1kworker/1:0H23:02:351
81560,0rcu_preempt3-21ksoftirqd/021:35:440
81560,0rcu_preempt3-21ksoftirqd/020:48:280
81560,0rcu_preempt3-21ksoftirqd/019:48:300
10050560,0irq/346-484840021474-1kworker/1:1H21:47:161
10050560,0irq/346-484840014377-21gzip22:43:321
10050560,0irq/346-484840012375-1kworker/1:3H00:21:031
81550,0rcu_preempt3-21ksoftirqd/022:13:280
81550,0rcu_preempt3-21ksoftirqd/020:18:320
81550,0rcu_preempt3-21ksoftirqd/000:37:020
81550,0rcu_preempt2923-21kworker/0:022:03:270
10050550,0irq/346-484840054-21kswapd021:24:300
9950540,0irq/345-48484006381-21ssh21:29:591
81540,0rcu_preempt3-21ksoftirqd/023:23:160
81540,0rcu_preempt3-21ksoftirqd/021:28:300
81540,0rcu_preempt3-21ksoftirqd/020:23:330
81540,0rcu_preempt3-21ksoftirqd/020:03:280
81540,0rcu_preempt26365-21runrttasks22:23:220
10050540,0irq/346-484840054-21kswapd023:42:001
10050540,0irq/346-484840054-21kswapd023:09:191
10050540,0irq/346-484840054-21kswapd022:29:450
10050540,0irq/346-484840054-21kswapd019:58:310
10050540,0irq/346-484840054-21kswapd000:15:361
941599537,0cyclictest0-21swapper/000:33:040
81530,0rcu_preempt3-21ksoftirqd/023:38:290
81530,0rcu_preempt3-21ksoftirqd/023:17:060
81530,0rcu_preempt3-21ksoftirqd/022:43:340
81530,0rcu_preempt3-21ksoftirqd/021:08:250
81530,0rcu_preempt3-21ksoftirqd/020:33:280
81530,0rcu_preempt3-21ksoftirqd/000:08:300
81530,0rcu_preempt1267-21kworker/0:120:53:160
10050530,0irq/346-484840054-21kswapd022:56:591
10050530,0irq/346-484840021464-1kworker/1:2H23:27:541
9950520,0irq/345-48484008830-1kworker/1:0H22:14:411
9950520,0irq/345-484840029893-1kworker/1:1H00:05:551
81520,0rcu_preempt19-21ksoftirqd/123:13:171
81520,0rcu_preempt19-21ksoftirqd/119:43:151
81520,0rcu_preempt19-21ksoftirqd/119:43:151
10050520,0irq/346-484840054-21kswapd022:51:571
10050520,0irq/346-484840032367-21ssh21:56:391
10050520,0irq/346-48484000-21swapper/100:36:441
9950510,0irq/345-4848400429-1kworker/1:1H22:32:501
9950510,0irq/345-48484002441-1kworker/1:0H00:11:021
9950510,0irq/345-484840019167-1kworker/1:0H21:10:571
81510,0rcu_preempt3-21ksoftirqd/021:54:080
81510,0rcu_preempt3-21ksoftirqd/021:50:440
81510,0rcu_preempt3-21ksoftirqd/021:18:290
81510,0rcu_preempt3-21ksoftirqd/021:13:270
81510,0rcu_preempt15241-21ssh21:38:350
81510,0rcu_preempt15160-21kworker/0:023:21:260
81510,0rcu_preempt12699-21kworker/0:100:27:320
10050510,0irq/346-484840054-21kswapd000:31:281
9950500,0irq/345-484840026413-1kworker/1:0H21:50:391
10050500,0irq/346-484840054-21kswapd021:42:231
10050500,0irq/346-484840054-21kswapd021:21:111
10050500,0irq/346-48484003588-21ssh21:27:491
10050500,0irq/346-484840027510-21ssh00:03:011
10050500,0irq/346-48484002508-21ssh23:04:091
81490,0rcu_preempt3-21ksoftirqd/020:58:280
10050490,0irq/346-48484002761-21ssh21:58:491
81480,0rcu_preempt3-21ksoftirqd/019:42:540
10050480,0irq/346-484840054-21kswapd023:37:271
10050480,0irq/346-484840029793-21ssh22:26:501
81470,0rcu_preempt7909-21apt-get19:03:171
81470,0rcu_preempt16697-21kworker/0:019:44:190
81470,0rcu_preempt16697-21kworker/0:019:44:190
10050470,0irq/346-48484005929-21ssh22:35:021
10050470,0irq/346-484840018072-21ssh23:20:021
10050470,0irq/346-484840010002-21ssh22:38:511
9415994610,0cyclictest0-21swapper/019:23:070
81460,0rcu_preempt19-21ksoftirqd/120:23:191
10050450,0irq/346-48484004147-1kworker/0:0H19:03:300
81440,0rcu_preempt3-21ksoftirqd/019:08:470
10050440,0irq/346-4848400851-21rngd20:35:321
10050440,0irq/346-484840027600-1kworker/1:0H23:32:011
10050440,0irq/346-484840011174-21ssh21:34:461
81430,0rcu_preempt7690-21awk20:38:331
81430,0rcu_preempt19-21ksoftirqd/120:08:311
10050430,0irq/346-484840012698-21ping19:23:441
81420,0rcu_preempt19-21ksoftirqd/123:44:101
81420,0rcu_preempt19-21ksoftirqd/119:19:061
9415994118,0cyclictest12698-21ping19:28:170
9415994117,0cyclictest12698-21ping19:33:180
9415994117,0cyclictest12698-21ping19:23:190
81410,0rcu_preempt19-21ksoftirqd/119:38:411
81410,0rcu_preempt19-21ksoftirqd/119:28:361
10050370,0irq/346-484840016412-21munin-run21:08:051
81360,0rcu_preempt19-21ksoftirqd/120:59:311
81360,0rcu_preempt19-21ksoftirqd/120:28:321
81360,0rcu_preempt19-21ksoftirqd/120:18:211
81350,0rcu_preempt19-21ksoftirqd/120:53:171
81350,0rcu_preempt19-21ksoftirqd/120:48:241
81350,0rcu_preempt19-21ksoftirqd/119:53:061
81350,0rcu_preempt19-21ksoftirqd/119:08:251
10050350,0irq/346-484840025485-21ping20:00:211
10050350,0irq/346-48484000-21swapper/120:17:241
10050350,0irq/346-48484000-21swapper/119:13:191
81340,0rcu_preempt19-21ksoftirqd/119:53:321
276052340,0chrt27174-1kworker/1:0H20:03:081
10050330,0irq/346-48484008559-21diskstats20:43:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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