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2026-09-15 - 16:21

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 Tue Sep 15, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
87952790,0chrt9950irq/345-484840011:08:240
81770,0rcu_preempt3-21ksoftirqd/012:21:180
81760,0rcu_preempt54-21kswapd012:00:161
81740,0rcu_preempt836-21rngd11:58:111
81740,0rcu_preempt19-21ksoftirqd/111:06:531
81730,0rcu_preempt19-21ksoftirqd/109:23:341
81720,0rcu_preempt3-21ksoftirqd/010:04:030
81710,0rcu_preempt3-21ksoftirqd/010:52:210
81710,0rcu_preempt3-21ksoftirqd/010:28:320
81710,0rcu_preempt3-21ksoftirqd/009:41:450
81710,0rcu_preempt19-21ksoftirqd/110:20:181
81700,0rcu_preempt3-21ksoftirqd/011:03:210
81700,0rcu_preempt3-21ksoftirqd/009:55:230
81700,0rcu_preempt3-21ksoftirqd/009:31:410
81700,0rcu_preempt19-21ksoftirqd/112:14:421
81700,0rcu_preempt19-21ksoftirqd/111:47:441
81700,0rcu_preempt19-21ksoftirqd/111:43:501
81700,0rcu_preempt19-21ksoftirqd/111:43:501
81690,0rcu_preempt3-21ksoftirqd/010:48:440
81690,0rcu_preempt3-21ksoftirqd/010:10:570
81690,0rcu_preempt3-21ksoftirqd/009:38:030
81680,0rcu_preempt3-21ksoftirqd/012:17:230
81680,0rcu_preempt3-21ksoftirqd/011:38:410
81680,0rcu_preempt19-21ksoftirqd/112:04:381
81680,0rcu_preempt19-21ksoftirqd/112:04:381
81680,0rcu_preempt19-21ksoftirqd/111:00:591
81680,0rcu_preempt19-21ksoftirqd/110:41:381
81680,0rcu_preempt17947-21meminfo10:44:371
81660,0rcu_preempt3-21ksoftirqd/012:04:380
81660,0rcu_preempt3-21ksoftirqd/012:04:380
81660,0rcu_preempt19-21ksoftirqd/112:25:561
81660,0rcu_preempt19-21ksoftirqd/109:44:271
81650,0rcu_preempt19-21ksoftirqd/111:35:291
81640,0rcu_preempt3-21ksoftirqd/011:09:290
81640,0rcu_preempt19-21ksoftirqd/112:23:311
81640,0rcu_preempt19-21ksoftirqd/109:09:551
10050640,0irq/346-484840021077-21ssh09:42:591
81620,0rcu_preempt19-21ksoftirqd/110:35:011
81620,0rcu_preempt19-21ksoftirqd/109:31:001
81610,0rcu_preempt19-21ksoftirqd/112:13:401
81610,0rcu_preempt19-21ksoftirqd/111:29:411
81610,0rcu_preempt19-21ksoftirqd/111:18:461
81610,0rcu_preempt19-21ksoftirqd/110:17:411
81610,0rcu_preempt19-21ksoftirqd/109:34:201
10050610,0irq/346-484840012609-21cyclictest12:36:051
81600,0rcu_preempt3-21ksoftirqd/011:45:150
81600,0rcu_preempt3-21ksoftirqd/010:04:250
81600,0rcu_preempt19-21ksoftirqd/110:31:001
81590,0rcu_preempt3-21ksoftirqd/011:39:430
81590,0rcu_preempt3-21ksoftirqd/011:39:430
81590,0rcu_preempt19-21ksoftirqd/111:52:331
81590,0rcu_preempt19-21ksoftirqd/110:12:141
81590,0rcu_preempt19-21ksoftirqd/107:56:271
81590,0rcu_preempt19-21ksoftirqd/107:56:271
9950580,0irq/345-48484000-21swapper/009:44:490
81580,0rcu_preempt54-21kswapd011:19:430
10050580,0irq/346-484840029619-1kworker/0:2H09:51:520
10050580,0irq/346-484840028053-21ssh09:17:201
81570,0rcu_preempt19-21ksoftirqd/110:50:311
10050570,0irq/346-48484009051-21ssh10:03:311
10050570,0irq/346-484840031601-21ssh10:58:531
10050570,0irq/346-484840028701-1kworker/0:1H12:02:140
9950560,0irq/345-4848400181ktimersoftd/111:27:581
81560,0rcu_preempt19-21ksoftirqd/112:33:451
81560,0rcu_preempt19-21ksoftirqd/108:04:271
81560,0rcu_preempt15547-21kworker/0:110:31:360
10050560,0irq/346-484840017164-1kworker/0:1H10:15:000
81550,0rcu_preempt3-21ksoftirqd/008:11:120
81540,0rcu_preempt3-21ksoftirqd/012:29:290
81540,0rcu_preempt3-21ksoftirqd/012:09:170
81540,0rcu_preempt3-21ksoftirqd/009:24:270
81540,0rcu_preempt3-21ksoftirqd/008:50:160
10050540,0irq/346-484840017165-1kworker/0:2H10:34:400
81530,0rcu_preempt3-21ksoftirqd/011:18:580
81530,0rcu_preempt3-21ksoftirqd/010:58:000
81530,0rcu_preempt3-21ksoftirqd/008:04:460
81530,0rcu_preempt19-21ksoftirqd/110:24:321
9950520,0irq/345-484840019269-1kworker/0:0H09:21:470
9950520,0irq/345-484840015890-21ping07:40:301
9950520,0irq/345-484840015890-21ping07:40:301
81520,0rcu_preempt3-21ksoftirqd/012:24:260
81520,0rcu_preempt3-21ksoftirqd/010:23:590
81520,0rcu_preempt19-21ksoftirqd/111:12:141
81520,0rcu_preempt19-21ksoftirqd/108:29:291
10050520,0irq/346-484840031144-1kworker/0:2H12:38:070
10050520,0irq/346-484840019540-1kworker/0:4H11:52:190
81500,0rcu_preempt3-21ksoftirqd/008:24:440
81500,0rcu_preempt3-21ksoftirqd/008:24:440
81500,0rcu_preempt3-21ksoftirqd/007:04:340
10050500,0irq/346-484840024462-21ssh11:24:170
9950490,0irq/345-484840029620-1kworker/1:2H09:51:521
81490,0rcu_preempt4538-21kworker/0:108:23:480
81490,0rcu_preempt3-21ksoftirqd/011:29:340
81490,0rcu_preempt3-21ksoftirqd/010:39:450
81490,0rcu_preempt3-21ksoftirqd/007:14:350
9950480,0irq/345-484840019269-1kworker/0:0H09:15:030
81480,0rcu_preempt3-21ksoftirqd/011:55:470
81480,0rcu_preempt3-21ksoftirqd/008:35:410
81480,0rcu_preempt3-21ksoftirqd/008:33:130
81480,0rcu_preempt19-21ksoftirqd/108:20:451
81480,0rcu_preempt19-21ksoftirqd/108:04:161
81480,0rcu_preempt19-21ksoftirqd/107:35:321
81480,0rcu_preempt19-21ksoftirqd/107:28:291
10050480,0irq/346-484840018181-21irqstats07:24:390
9950470,0irq/345-48484000-21swapper/111:22:111
81470,0rcu_preempt3-21ksoftirqd/007:54:450
81470,0rcu_preempt3-21ksoftirqd/007:54:450
81470,0rcu_preempt19-21ksoftirqd/108:14:351
81470,0rcu_preempt19-21ksoftirqd/108:09:351
81470,0rcu_preempt19-21ksoftirqd/107:45:031
81470,0rcu_preempt19-21ksoftirqd/107:29:501
81470,0rcu_preempt11526-21apt-get08:44:260
81460,0rcu_preempt5993-21kworker/0:007:20:220
81460,0rcu_preempt3-21ksoftirqd/007:59:340
81460,0rcu_preempt19-21ksoftirqd/108:24:311
81460,0rcu_preempt19-21ksoftirqd/108:24:311
81460,0rcu_preempt18492-21kworker/0:209:09:170
10050460,0irq/346-4848400542-21ssh09:54:401
81450,0rcu_preempt54-21kswapd007:52:020
81450,0rcu_preempt3-21ksoftirqd/009:03:470
81450,0rcu_preempt3-21ksoftirqd/008:39:430
81450,0rcu_preempt3-21ksoftirqd/008:15:180
81450,0rcu_preempt19-21ksoftirqd/109:04:261
81450,0rcu_preempt19-21ksoftirqd/109:04:261
81450,0rcu_preempt19-21ksoftirqd/107:19:391
81450,0rcu_preempt18102-21apt-get09:04:260
81450,0rcu_preempt18102-21apt-get09:04:260
10050450,0irq/346-484840013332-21munin-node0
81440,0rcu_preempt19-21ksoftirqd/108:39:331
10050440,0irq/346-48484000-21swapper/109:25:121
9950430,0irq/345-484840014006-21ssh10:08:311
81430,0rcu_preempt19-21ksoftirqd/107:04:321
81420,0rcu_preempt3-21ksoftirqd/007:49:140
81420,0rcu_preempt19-21ksoftirqd/107:14:161
10050420,0irq/346-48484001445-21runrttasks08:56:040
10050420,0irq/346-48484000-21swapper/107:19:171
81410,0rcu_preempt19-21ksoftirqd/108:37:481
81410,0rcu_preempt19-21ksoftirqd/107:49:341
9950390,0irq/345-48484000-21swapper/007:29:380
81390,0rcu_preempt19-21ksoftirqd/108:59:331
81390,0rcu_preempt19-21ksoftirqd/108:49:331
81380,0rcu_preempt19-21ksoftirqd/108:49:081
81370,0rcu_preempt3-21ksoftirqd/007:34:340
81370,0rcu_preempt19-21ksoftirqd/108:54:301
81360,0rcu_preempt22183-1kworker/0:0H07:39:400
81360,0rcu_preempt22183-1kworker/0:0H07:39:400
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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