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2026-09-15 - 00:12

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 Sep 14, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811400,0rcu_preempt19-21ksoftirqd/112:34:281
81860,0rcu_preempt54-21kswapd010:11:121
10050810,0irq/346-4848400111rcuc/011:59:270
10050800,0irq/346-484840041ktimersoftd/011:39:040
10050780,0irq/346-4848400111rcuc/010:01:290
81760,0rcu_preempt3-21ksoftirqd/011:57:060
81760,0rcu_preempt3-21ksoftirqd/009:44:280
81760,0rcu_preempt3-21ksoftirqd/009:15:330
10050760,0irq/346-4848400111rcuc/012:18:470
81750,0rcu_preempt19-21ksoftirqd/110:16:421
81740,0rcu_preempt3-21ksoftirqd/012:34:340
81740,0rcu_preempt3-21ksoftirqd/010:28:490
81740,0rcu_preempt19-21ksoftirqd/112:19:141
81740,0rcu_preempt19-21ksoftirqd/110:27:571
81740,0rcu_preempt19-21ksoftirqd/109:21:021
81730,0rcu_preempt6481-21munin-node1
81730,0rcu_preempt3-21ksoftirqd/010:16:060
81720,0rcu_preempt3-21ksoftirqd/009:23:520
81720,0rcu_preempt24888-21kworker/1:211:53:281
81720,0rcu_preempt19-21ksoftirqd/109:28:321
81710,0rcu_preempt3-21ksoftirqd/012:10:280
81710,0rcu_preempt3-21ksoftirqd/010:19:430
81710,0rcu_preempt3-21ksoftirqd/010:12:570
81710,0rcu_preempt3-21ksoftirqd/009:33:560
10050710,0irq/346-484840041ktimersoftd/011:27:520
10050710,0irq/346-4848400111rcuc/009:25:410
81700,0rcu_preempt3-21ksoftirqd/011:39:360
81700,0rcu_preempt3-21ksoftirqd/010:43:270
81700,0rcu_preempt3-21ksoftirqd/009:35:060
81700,0rcu_preempt19-21ksoftirqd/107:29:161
81680,0rcu_preempt3-21ksoftirqd/011:48:010
81680,0rcu_preempt3-21ksoftirqd/011:33:010
81680,0rcu_preempt19-21ksoftirqd/110:52:541
81670,0rcu_preempt3-21ksoftirqd/011:51:360
81670,0rcu_preempt3-21ksoftirqd/011:08:110
81670,0rcu_preempt19-21ksoftirqd/112:32:461
81660,0rcu_preempt19-21ksoftirqd/110:45:331
81660,0rcu_preempt19-21ksoftirqd/110:03:241
1595399661,0cyclictest19235-21ping07:29:280
10050660,0irq/346-4848400111rcuc/012:23:460
81650,0rcu_preempt54-21kswapd011:42:431
81650,0rcu_preempt19-21ksoftirqd/109:57:221
81650,0rcu_preempt14861-21apt-get08:44:260
1595399637,0cyclictest18694-1kworker/0:1H12:26:180
1595399637,0cyclictest18694-1kworker/0:1H12:26:180
81620,0rcu_preempt3-21ksoftirqd/009:09:290
1595399622,0cyclictest3860-21ssh10:59:320
10050620,0irq/346-484840054-21kswapd011:21:411
81610,0rcu_preempt3-21ksoftirqd/008:19:370
81610,0rcu_preempt19-21ksoftirqd/112:09:331
81610,0rcu_preempt19-21ksoftirqd/111:12:021
1595399612,0cyclictest0-21swapper/010:29:360
81600,0rcu_preempt19-21ksoftirqd/111:59:211
81600,0rcu_preempt19-21ksoftirqd/111:09:061
81600,0rcu_preempt0-21swapper/109:46:351
10050600,0irq/346-484840028104-1kworker/1:1H11:57:541
81590,0rcu_preempt32182-21ssh11:27:471
1595399597,0cyclictest5851-1kworker/0:0H09:57:370
1595399595,0cyclictest10050irq/346-484840010:45:420
1595399592,0cyclictest19235-21ping07:39:290
81580,0rcu_preempt0-21swapper/111:36:211
1595399582,0cyclictest4361-21ssh12:04:360
15953995810,0cyclictest25777-21sendmail07:39:170
15953995810,0cyclictest25777-21sendmail07:39:170
10050580,0irq/346-4848400802-1kworker/0:1H09:51:280
10050580,0irq/346-484840054-21kswapd011:00:361
10050580,0irq/346-484840021191-1kworker/0:1H11:16:510
81570,0rcu_preempt19-21ksoftirqd/111:47:361
1595399574,0cyclictest836-21rngd11:14:160
1595399572,0cyclictest14070-21sh10:37:060
1595399571,0cyclictest19235-21ping07:44:280
10050570,0irq/346-484840025917-1kworker/1:3H07:39:401
10050570,0irq/346-484840021191-1kworker/0:1H11:21:150
81560,0rcu_preempt19235-21ping07:34:381
81560,0rcu_preempt19235-21ping07:34:381
81560,0rcu_preempt19-21ksoftirqd/112:25:381
81560,0rcu_preempt19-21ksoftirqd/112:25:381
1595399562,0cyclictest0-21swapper/012:29:170
1595399561,0cyclictest0-21swapper/009:39:290
10050560,0irq/346-48484005397-1kworker/1:3H11:30:491
1595399557,0cyclictest13051-21sh08:39:160
1595399552,0cyclictest0-21swapper/007:54:450
15953995512,0cyclictest0-21swapper/010:08:270
10050550,0irq/346-484840028232-1kworker/1:0H09:49:241
10050550,0irq/346-484840021497-1kworker/1:2H12:22:571
9950540,0irq/345-484840032354-21sendmail-msp07:59:191
81540,0rcu_preempt19-21ksoftirqd/110:19:221
81540,0rcu_preempt19-21ksoftirqd/109:09:511
1595399542,0cyclictest0-21swapper/008:59:330
1595399542,0cyclictest0-21swapper/008:54:340
1595399541,0cyclictest29232-21ssh10:52:180
1595399541,0cyclictest19235-21ping07:29:160
1595399541,0cyclictest19235-21ping07:19:290
81530,0rcu_preempt29793-21memory07:49:411
81530,0rcu_preempt19-21ksoftirqd/110:04:351
1595399537,0cyclictest19256-21sendmail-msp07:19:170
10050530,0irq/346-484840054-21kswapd009:40:591
10050530,0irq/346-484840054-21kswapd009:36:551
1595399522,0cyclictest0-21swapper/010:55:140
1595399522,0cyclictest0-21swapper/008:49:380
1595399522,0cyclictest0-21swapper/008:04:340
10050520,0irq/346-48484001051-21lighttpd12:04:201
81510,0rcu_preempt3-21ksoftirqd/008:29:360
81510,0rcu_preempt19465-21ssh10:42:351
81510,0rcu_preempt19-21ksoftirqd/108:24:361
1595399513,0cyclictest32005-21ping08:14:340
15953995114,0cyclictest0-21swapper/008:43:130
15953995112,0cyclictest0-21swapper/007:59:440
81500,0rcu_preempt19-21ksoftirqd/108:14:281
81500,0rcu_preempt19-21ksoftirqd/108:04:291
81500,0rcu_preempt19-21ksoftirqd/107:46:151
1595399502,0cyclictest0-21swapper/008:28:530
81490,0rcu_preempt19-21ksoftirqd/109:29:321
10050490,0irq/346-484840022810-21ssh11:18:351
81480,0rcu_preempt32005-21ping08:09:460
1595399481,0cyclictest17332-21runrttasks07:11:420
10050480,0irq/346-48484001125-1kworker/1:0H10:57:061
81470,0rcu_preempt3-21ksoftirqd/007:04:380
81470,0rcu_preempt29206-21munin-node0
81470,0rcu_preempt24888-21kworker/1:208:39:381
81470,0rcu_preempt19-21ksoftirqd/108:54:341
81470,0rcu_preempt19-21ksoftirqd/108:24:161
81470,0rcu_preempt19-21ksoftirqd/107:54:331
81460,0rcu_preempt19802-21apt-get08:59:271
81460,0rcu_preempt19-21ksoftirqd/110:34:421
81460,0rcu_preempt19-21ksoftirqd/108:34:341
81450,0rcu_preempt19-21ksoftirqd/108:10:171
81450,0rcu_preempt19-21ksoftirqd/107:19:521
81440,0rcu_preempt3-21ksoftirqd/009:04:370
10050430,0irq/346-484840032724-21ssh09:19:021
81420,0rcu_preempt19-21ksoftirqd/107:29:401
81420,0rcu_preempt19-21ksoftirqd/107:14:281
81390,0rcu_preempt54-21kswapd008:52:571
81380,0rcu_preempt19-21ksoftirqd/109:08:311
81380,0rcu_preempt19-21ksoftirqd/108:46:331
81380,0rcu_preempt0-21swapper/107:09:331
81360,0rcu_preempt19-21ksoftirqd/108:30:561
81360,0rcu_preempt19-21ksoftirqd/107:05:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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