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2025-11-24 - 09:23

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Mon Nov 24, 2025 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10050820,0irq/346-4848400171rcuc/121:44:531
81780,0rcu_preempt7229-1kworker/0:2H23:06:060
81770,0rcu_preempt19-21ksoftirqd/123:34:131
81760,0rcu_preempt3949-21cyclictest23:11:141
81760,0rcu_preempt19-21ksoftirqd/123:36:331
81760,0rcu_preempt19-21ksoftirqd/122:49:241
81760,0rcu_preempt19-21ksoftirqd/121:29:221
81750,0rcu_preempt10860-21kworker/u4:123:00:351
81740,0rcu_preempt3-21ksoftirqd/021:23:140
81740,0rcu_preempt19-21ksoftirqd/121:35:531
81740,0rcu_preempt19-21ksoftirqd/121:35:531
81740,0rcu_preempt10864-21diskmemload00:35:351
81740,0rcu_preempt10864-21diskmemload00:35:351
81710,0rcu_preempt19-21ksoftirqd/122:42:581
81700,0rcu_preempt15138-21kworker/1:022:10:081
81690,0rcu_preempt19-21ksoftirqd/123:05:331
81690,0rcu_preempt19-21ksoftirqd/100:11:241
10050690,0irq/346-4848400181ktimersoftd/121:17:151
81680,0rcu_preempt19-21ksoftirqd/122:49:341
9950670,0irq/345-4848400181ktimersoftd/121:23:161
81670,0rcu_preempt54-21kswapd022:34:020
81670,0rcu_preempt54-21kswapd000:19:111
81670,0rcu_preempt3-21ksoftirqd/000:19:090
81670,0rcu_preempt19-21ksoftirqd/123:54:271
81670,0rcu_preempt19-21ksoftirqd/122:00:061
266132670,0sleep19950irq/345-484840022:06:481
9950660,0irq/345-4848400171rcuc/123:15:021
81660,0rcu_preempt19-21ksoftirqd/100:22:361
81660,0rcu_preempt19-21ksoftirqd/100:01:251
10050660,0irq/346-4848400171rcuc/100:33:021
9950650,0irq/345-4848400181ktimersoftd/123:55:411
81650,0rcu_preempt19-21ksoftirqd/123:20:091
81650,0rcu_preempt19-21ksoftirqd/121:58:311
81650,0rcu_preempt19-21ksoftirqd/121:58:311
190812650,0sleep09950irq/345-484840023:15:300
10050650,0irq/346-484840025324-1kworker/0:2H21:29:330
81640,0rcu_preempt54-21kswapd021:34:050
81640,0rcu_preempt3-21ksoftirqd/000:37:010
81640,0rcu_preempt3-21ksoftirqd/000:37:010
81630,0rcu_preempt3-21ksoftirqd/000:12:350
81630,0rcu_preempt3-21ksoftirqd/000:06:210
81630,0rcu_preempt19-21ksoftirqd/121:50:521
81630,0rcu_preempt19-21ksoftirqd/121:50:521
10050630,0irq/346-484840017238-21sshd22:34:530
81620,0rcu_preempt54-21kswapd022:46:260
81620,0rcu_preempt19-21ksoftirqd/121:40:191
81620,0rcu_preempt19-21ksoftirqd/121:31:411
31462620,0chrt9950irq/345-484840021:39:200
31462620,0chrt9950irq/345-484840021:39:200
148622620,0sleep09950irq/345-484840021:53:020
148622620,0sleep09950irq/345-484840021:53:020
9950610,0irq/345-484840027018-21runrttasks20:19:370
81610,0rcu_preempt3-21ksoftirqd/023:50:500
81610,0rcu_preempt3-21ksoftirqd/023:47:010
81610,0rcu_preempt3-21ksoftirqd/022:22:330
81610,0rcu_preempt3-21ksoftirqd/022:22:330
81610,0rcu_preempt3-21ksoftirqd/020:54:540
81610,0rcu_preempt19-21ksoftirqd/122:56:471
10050610,0irq/346-4848400171rcuc/100:25:361
81600,0rcu_preempt3-21ksoftirqd/023:59:470
81600,0rcu_preempt3-21ksoftirqd/000:25:330
10050600,0irq/346-484840031369-1kworker/0:2H22:54:330
10050600,0irq/346-4848400171rcuc/123:27:571
9950590,0irq/345-484840029276-21ssh22:09:590
81590,0rcu_preempt54-21kswapd020:49:440
81590,0rcu_preempt3-21ksoftirqd/021:43:530
81590,0rcu_preempt3-21ksoftirqd/021:11:350
81590,0rcu_preempt3-21ksoftirqd/019:25:070
81590,0rcu_preempt19-21ksoftirqd/123:43:551
81590,0rcu_preempt19-21ksoftirqd/100:04:451
9950580,0irq/345-484840019975-21latency_hist21:59:330
9950580,0irq/345-484840019975-21latency_hist21:59:330
81580,0rcu_preempt3-21ksoftirqd/022:07:240
10050580,0irq/346-48484008400-21date21:44:560
10050580,0irq/346-48484007229-1kworker/0:2H23:11:330
10050580,0irq/346-484840017956-1kworker/0:1H22:00:050
10050580,0irq/346-484840012288-1kworker/0:0H23:54:440
81570,0rcu_preempt3-21ksoftirqd/000:32:390
81570,0rcu_preempt19-21ksoftirqd/121:10:011
81570,0rcu_preempt11878-1kworker/0:1H19:34:520
81570,0rcu_preempt11878-1kworker/0:1H19:34:520
215522570,0sleep010050irq/346-484840020:00:120
17322570,0chrt9950irq/345-484840022:15:280
10050570,0irq/346-48484006571-1kworker/0:0H23:40:490
10050570,0irq/346-48484005388-1kworker/0:0H22:59:590
9950560,0irq/345-48484000-21swapper/023:29:510
81560,0rcu_preempt3-21ksoftirqd/000:20:330
81560,0rcu_preempt19-21ksoftirqd/122:24:471
81560,0rcu_preempt1854-21ntp_states20:39:580
81560,0rcu_preempt15138-21kworker/1:019:44:541
10050560,0irq/346-484840023077-1kworker/0:3H22:44:210
10050560,0irq/346-4848400171rcuc/122:22:461
10050560,0irq/346-4848400171rcuc/122:22:461
266602550,0sleep010050irq/346-484840020:17:280
108782550,0chrt9950irq/345-484840021:09:320
10050550,0irq/346-4848400623-1kworker/0:3H20:39:330
10050550,0irq/346-4848400623-1kworker/0:3H20:39:330
10050550,0irq/346-484840031099-21ssh22:50:570
9950540,0irq/345-48484002976-21sed23:35:020
9950540,0irq/345-484840026070-21rm23:24:470
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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