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2026-05-15 - 00:18

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 Thu May 14, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811270,0rcu_preempt3-21ksoftirqd/012:21:210
811250,0rcu_preempt3-21ksoftirqd/012:03:590
811240,0rcu_preempt3-21ksoftirqd/011:34:250
811240,0rcu_preempt3-21ksoftirqd/011:32:170
81890,0rcu_preempt9541-21kworker/0:110:45:060
81880,0rcu_preempt3-21ksoftirqd/011:43:280
81880,0rcu_preempt26244-21kworker/0:111:05:580
81870,0rcu_preempt3-21ksoftirqd/008:42:460
81870,0rcu_preempt1723-21kworker/0:209:10:570
81860,0rcu_preempt3-21ksoftirqd/011:38:250
81850,0rcu_preempt3-21ksoftirqd/007:18:360
81840,0rcu_preempt3-21ksoftirqd/010:38:030
81840,0rcu_preempt26244-21kworker/0:111:11:050
81840,0rcu_preempt14355-21chrt11:18:190
81830,0rcu_preempt3-21ksoftirqd/007:59:590
81830,0rcu_preempt3-21ksoftirqd/007:54:020
81820,0rcu_preempt3-21ksoftirqd/012:23:240
81820,0rcu_preempt3-21ksoftirqd/012:23:240
81820,0rcu_preempt3-21ksoftirqd/010:48:160
81820,0rcu_preempt3-21ksoftirqd/010:23:230
81820,0rcu_preempt3-21ksoftirqd/009:38:290
81800,0rcu_preempt3-21ksoftirqd/012:14:250
81800,0rcu_preempt3-21ksoftirqd/011:53:190
81800,0rcu_preempt3-21ksoftirqd/011:27:450
81800,0rcu_preempt3-21ksoftirqd/008:26:050
81800,0rcu_preempt3-21ksoftirqd/008:03:360
81800,0rcu_preempt3-21ksoftirqd/007:28:330
81800,0rcu_preempt19-21ksoftirqd/110:28:231
81790,0rcu_preempt3-21ksoftirqd/011:13:280
81790,0rcu_preempt3-21ksoftirqd/009:17:190
81790,0rcu_preempt3-21ksoftirqd/008:20:350
81790,0rcu_preempt3-21ksoftirqd/007:08:190
81790,0rcu_preempt26244-21kworker/0:111:01:340
81790,0rcu_preempt19047-21kworker/0:112:02:290
81780,0rcu_preempt3-21ksoftirqd/010:20:060
81780,0rcu_preempt3-21ksoftirqd/008:18:020
81780,0rcu_preempt32103-21kworker/0:010:03:190
81770,0rcu_preempt32467-21kworker/0:009:25:520
81770,0rcu_preempt3-21ksoftirqd/009:53:150
81770,0rcu_preempt3-21ksoftirqd/009:45:150
81770,0rcu_preempt3-21ksoftirqd/008:08:350
81770,0rcu_preempt10810-21kworker/0:212:35:320
81760,0rcu_preempt3730-21kworker/0:209:34:340
81760,0rcu_preempt3-21ksoftirqd/010:33:310
81760,0rcu_preempt3-21ksoftirqd/010:15:100
81760,0rcu_preempt3-21ksoftirqd/008:48:280
81760,0rcu_preempt3-21ksoftirqd/007:13:350
81760,0rcu_preempt15027-21diskmemload10:00:440
10050760,0irq/346-484840054-21kswapd011:51:140
81750,0rcu_preempt3-21ksoftirqd/012:09:080
81750,0rcu_preempt3-21ksoftirqd/010:09:000
81750,0rcu_preempt3-21ksoftirqd/009:48:070
81750,0rcu_preempt3-21ksoftirqd/009:00:410
81750,0rcu_preempt3-21ksoftirqd/008:57:020
81740,0rcu_preempt3-21ksoftirqd/012:31:290
81740,0rcu_preempt3-21ksoftirqd/010:32:520
81740,0rcu_preempt3-21ksoftirqd/009:03:390
81740,0rcu_preempt3-21ksoftirqd/008:43:240
81740,0rcu_preempt3-21ksoftirqd/008:31:230
81740,0rcu_preempt3-21ksoftirqd/007:49:380
81730,0rcu_preempt3-21ksoftirqd/010:55:480
81730,0rcu_preempt3-21ksoftirqd/009:32:420
81730,0rcu_preempt3-21ksoftirqd/009:18:570
81730,0rcu_preempt3-21ksoftirqd/008:36:510
81730,0rcu_preempt3-21ksoftirqd/007:43:160
81720,0rcu_preempt3-21ksoftirqd/007:23:360
81680,0rcu_preempt11314-21ping07:38:190
10050640,0irq/346-48484003193-21cron12:13:021
81630,0rcu_preempt3-21ksoftirqd/007:33:280
9950590,0irq/345-4848400802899cyclictest12:25:571
9950590,0irq/345-4848400802899cyclictest12:25:571
9950590,0irq/345-4848400181ktimersoftd/112:02:221
10050570,0irq/346-48484000-21swapper/112:15:441
9950560,0irq/345-4848400181ktimersoftd/111:54:581
9950540,0irq/345-4848400181ktimersoftd/111:47:301
9950530,0irq/345-484840026199-1kworker/1:0H11:33:161
13250530,0irq/301-48020008632-1kworker/1:1H11:48:151
10050530,0irq/346-48484006094-1kworker/0:2H07:05:120
9950520,0irq/345-4848400171rcuc/109:31:271
9950520,0irq/345-484840013142-1kworker/1:1H09:09:521
9950510,0irq/345-48484004183-1kworker/1:0H10:39:201
9950510,0irq/345-484840026679-1kworker/1:3H10:26:591
9950500,0irq/345-4848400171rcuc/111:09:301
81500,0rcu_preempt19-21ksoftirqd/110:33:031
10050500,0irq/346-48484000-21swapper/109:45:001
10050500,0irq/346-48484000-21swapper/109:22:151
9950490,0irq/345-4848400181ktimersoftd/112:33:171
9950490,0irq/345-4848400171rcuc/109:35:571
9950490,0irq/345-484840014098-1kworker/1:3H11:06:291
10050490,0irq/346-484840054-21kswapd011:15:181
10050490,0irq/346-48484000-21swapper/112:05:201
9950480,0irq/345-48484003709-1kworker/1:0H11:40:011
9950480,0irq/345-484840014098-1kworker/1:3H10:58:431
9950480,0irq/345-48484000-21swapper/110:22:541
81480,0rcu_preempt19-21ksoftirqd/107:03:181
10050480,0irq/346-484840020659-1kworker/1:2H12:31:161
9950470,0irq/345-484840027203-1kworker/1:3H09:38:371
9950470,0irq/345-484840027203-1kworker/1:3H09:24:111
10050470,0irq/346-484840054-21kswapd010:16:201
10050470,0irq/346-484840011314-21ping07:19:341
10050470,0irq/346-48484000-21swapper/111:20:361
10050470,0irq/346-48484000-21swapper/110:51:061
9950460,0irq/345-484840024502-1kworker/1:2H09:52:271
10050460,0irq/346-484840021153-21munin-run07:48:011
9950450,0irq/345-484840016313-1kworker/1:0H11:24:481
10050450,0irq/346-484840054-21kswapd010:46:271
10050450,0irq/346-484840023991-1kworker/1:0H10:57:441
10050440,0irq/346-484840011314-21ping07:26:041
10050430,0irq/346-48484001339-21snmpd12:19:351
81420,0rcu_preempt19-21ksoftirqd/108:13:231
10050390,0irq/346-48484007965-21ssh10:06:061
10050390,0irq/346-48484000-21swapper/109:59:371
10050390,0irq/346-48484000-21swapper/109:53:181
10050380,0irq/346-48484000-21swapper/109:16:291
9950360,0irq/345-48484001470-21runrttasks07:33:121
81360,0rcu_preempt21257-1kworker/1:1H11:28:291
10050360,0irq/346-484840014836-21wget07:28:151
10050340,0irq/346-484840024245-21ping08:24:191
10050340,0irq/346-48484000-21swapper/108:38:171
9950330,0irq/345-48484007271-21runrttasks08:43:191
275022330,0chrt27369-1kworker/1:1H08:05:461
10050330,0irq/346-48484000-21swapper/110:08:111
10050330,0irq/346-48484000-21swapper/109:03:261
10050330,0irq/346-48484000-21swapper/108:59:301
1699320,0migration/131935-21processes08:18:301
10050320,0irq/346-48484000-21swapper/108:29:021
10050320,0irq/346-48484000-21swapper/107:58:251
10050320,0irq/346-48484000-21swapper/107:50:191
9950310,0irq/345-48484000-21swapper/107:53:251
10050310,0irq/346-48484000-21swapper/108:35:451
10050310,0irq/346-48484000-21swapper/107:08:211
802899303,0cyclictest0-21swapper/108:51:221
10050290,0irq/346-48484001470-21runrttasks07:13:571
81280,0rcu_preempt19-21ksoftirqd/108:08:211
9950270,0irq/345-48484000-21swapper/108:53:201
81270,0rcu_preempt54-21kswapd007:38:291
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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