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2026-08-07 - 07:17

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 Fri Aug 07, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811170,0rcu_preempt2498-21ssh22:20:080
811110,0rcu_preempt21145-21ssh22:05:220
811070,0rcu_preempt3-21ksoftirqd/022:25:540
811060,0rcu_preempt15467-21kworker/0:023:35:320
81970,0rcu_preempt27623-21munin-run21:39:521
81840,0rcu_preempt3-21ksoftirqd/023:21:500
81820,0rcu_preempt3-21ksoftirqd/023:10:420
81820,0rcu_preempt3-21ksoftirqd/021:35:560
10050820,0irq/346-4848400111rcuc/000:05:180
10050810,0irq/346-4848400111rcuc/023:51:320
9950800,0irq/345-4848400111rcuc/022:10:060
10050800,0irq/346-4848400111rcuc/021:10:220
81780,0rcu_preempt3-21ksoftirqd/000:20:170
81780,0rcu_preempt3-21ksoftirqd/000:20:170
10050780,0irq/346-4848400111rcuc/021:22:370
9950770,0irq/345-4848400111rcuc/021:46:530
9950770,0irq/345-4848400111rcuc/021:46:530
81770,0rcu_preempt54-21kswapd022:09:191
81760,0rcu_preempt30642-21diskmemload21:30:191
10050760,0irq/346-4848400111rcuc/021:17:410
9950750,0irq/345-4848400111rcuc/022:43:110
81750,0rcu_preempt3-21ksoftirqd/022:51:560
81750,0rcu_preempt3-21ksoftirqd/000:33:380
9950740,0irq/345-4848400111rcuc/023:59:510
9950740,0irq/345-4848400111rcuc/000:38:020
81740,0rcu_preempt3-21ksoftirqd/023:09:320
81740,0rcu_preempt3-21ksoftirqd/022:15:570
81740,0rcu_preempt3-21ksoftirqd/022:02:260
81740,0rcu_preempt3-21ksoftirqd/021:40:090
81730,0rcu_preempt3-21ksoftirqd/022:39:300
81730,0rcu_preempt19-21ksoftirqd/121:42:441
9950720,0irq/345-4848400111rcuc/023:31:350
81720,0rcu_preempt3-21ksoftirqd/022:55:080
81720,0rcu_preempt3-21ksoftirqd/022:47:260
81720,0rcu_preempt3-21ksoftirqd/000:25:420
81720,0rcu_preempt19-21ksoftirqd/121:45:241
81720,0rcu_preempt19-21ksoftirqd/121:45:241
81720,0rcu_preempt15121-1kworker/0:0H00:12:070
81710,0rcu_preempt3-21ksoftirqd/023:47:410
81710,0rcu_preempt3-21ksoftirqd/023:26:320
81710,0rcu_preempt3-21ksoftirqd/022:30:560
81710,0rcu_preempt3-21ksoftirqd/021:34:430
2367099711,0cyclictest528750kworker/0:2H00:01:500
81700,0rcu_preempt3-21ksoftirqd/021:56:100
81700,0rcu_preempt3-21ksoftirqd/021:50:090
81690,0rcu_preempt3-21ksoftirqd/023:43:420
81690,0rcu_preempt3-21ksoftirqd/023:16:180
81690,0rcu_preempt3-21ksoftirqd/000:17:120
2367099692,0cyclictest0-21swapper/023:04:290
10050690,0irq/346-4848400111rcuc/021:26:050
81670,0rcu_preempt19-21ksoftirqd/122:39:071
81660,0rcu_preempt19-21ksoftirqd/122:58:101
81660,0rcu_preempt10999-21ssh00:07:501
81640,0rcu_preempt3-21ksoftirqd/020:30:050
2367099642,0cyclictest27767-21ntp_kernel_err19:20:260
81630,0rcu_preempt17103-1kworker/1:0H22:29:531
81630,0rcu_preempt0-21swapper/121:22:191
2367099631,0cyclictest26949-21ping19:45:110
81620,0rcu_preempt3-21ksoftirqd/019:15:140
81620,0rcu_preempt19-21ksoftirqd/122:19:001
81610,0rcu_preempt19-21ksoftirqd/120:05:121
301592600,0chrt10050irq/346-484840019:29:130
2367099605,0cyclictest1246-21munin-node0
81590,0rcu_preempt3-21ksoftirqd/019:50:100
2367099597,0cyclictest10934-21cron20:09:530
81580,0rcu_preempt19-21ksoftirqd/119:10:171
81580,0rcu_preempt19-21ksoftirqd/100:20:281
81580,0rcu_preempt19-21ksoftirqd/100:20:281
81580,0rcu_preempt0-21swapper/122:54:251
81570,0rcu_preempt6168-21apt-get19:55:040
81570,0rcu_preempt3-21ksoftirqd/020:10:240
81570,0rcu_preempt19-21ksoftirqd/123:30:231
2367099562,0cyclictest26949-21ping19:39:530
81550,0rcu_preempt19-21ksoftirqd/123:59:111
81550,0rcu_preempt19-21ksoftirqd/123:50:141
81550,0rcu_preempt19-21ksoftirqd/123:01:311
2367099552,0cyclictest0-21swapper/020:55:080
2367099552,0cyclictest0-21swapper/020:19:090
81540,0rcu_preempt7443-21ping20:00:210
81540,0rcu_preempt3-21ksoftirqd/021:00:140
81540,0rcu_preempt3-21ksoftirqd/020:40:090
81540,0rcu_preempt0-21swapper/121:13:401
2367099532,0cyclictest26949-21ping19:30:120
175752530,0chrt9950irq/345-484840000:14:531
81520,0rcu_preempt7443-21ping20:20:160
81520,0rcu_preempt3-21ksoftirqd/019:05:090
81520,0rcu_preempt19-21ksoftirqd/119:40:081
81520,0rcu_preempt0-21swapper/121:05:201
81520,0rcu_preempt0-21swapper/100:36:561
81510,0rcu_preempt0-21swapper/121:25:311
81500,0rcu_preempt3-21ksoftirqd/020:48:130
81500,0rcu_preempt3-21ksoftirqd/020:35:150
81500,0rcu_preempt0-21swapper/100:11:441
81490,0rcu_preempt3-21ksoftirqd/019:12:590
81490,0rcu_preempt30642-21diskmemload23:05:541
81480,0rcu_preempt3-21ksoftirqd/020:24:530
81480,0rcu_preempt16178-21kworker/1:223:17:111
81480,0rcu_preempt0-21swapper/123:13:211
81470,0rcu_preempt3-21ksoftirqd/021:05:200
81470,0rcu_preempt19-21ksoftirqd/120:14:351
81470,0rcu_preempt0-21swapper/123:26:271
81460,0rcu_preempt54-21kswapd022:21:401
81460,0rcu_preempt19-21ksoftirqd/122:34:041
81460,0rcu_preempt19-21ksoftirqd/121:56:581
81460,0rcu_preempt19-21ksoftirqd/120:25:031
81450,0rcu_preempt7443-21ping20:15:211
81450,0rcu_preempt3-21ksoftirqd/020:50:170
81450,0rcu_preempt19-21ksoftirqd/120:20:201
81440,0rcu_preempt19-21ksoftirqd/100:25:041
81430,0rcu_preempt26949-21ping19:20:331
81430,0rcu_preempt19-21ksoftirqd/123:35:031
81430,0rcu_preempt19-21ksoftirqd/119:30:241
81430,0rcu_preempt19-21ksoftirqd/119:19:531
81420,0rcu_preempt19-21ksoftirqd/123:47:311
81420,0rcu_preempt19-21ksoftirqd/119:25:181
10050420,0irq/346-48484002367199cyclictest22:45:121
9950410,0irq/345-48484002367199cyclictest21:19:531
9950410,0irq/345-48484002367199cyclictest00:32:521
81410,0rcu_preempt23669-21cyclictest20:00:131
81410,0rcu_preempt19-21ksoftirqd/123:21:051
81410,0rcu_preempt19-21ksoftirqd/122:43:441
81410,0rcu_preempt19-21ksoftirqd/122:10:051
81400,0rcu_preempt30642-21diskmemload23:40:411
81400,0rcu_preempt30642-21diskmemload22:02:041
81400,0rcu_preempt26949-21ping19:36:561
81400,0rcu_preempt22163-21apt-get19:05:041
81400,0rcu_preempt19295-21apt-get20:35:051
81400,0rcu_preempt19-21ksoftirqd/121:51:121
81400,0rcu_preempt19-21ksoftirqd/100:00:111
9950390,0irq/345-48484002367199cyclictest20:59:531
81380,0rcu_preempt19-21ksoftirqd/120:50:081
81380,0rcu_preempt19-21ksoftirqd/119:58:291
81370,0rcu_preempt19-21ksoftirqd/119:45:271
81360,0rcu_preempt19-21ksoftirqd/119:50:101
81360,0rcu_preempt17656-21apt-get20:30:041
81350,0rcu_preempt19-21ksoftirqd/120:59:541
81350,0rcu_preempt19-21ksoftirqd/120:45:061
81350,0rcu_preempt19-21ksoftirqd/120:40:031
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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