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2026-10-21 - 00:51

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 Tue Oct 20, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81940,0rcu_preempt19-21ksoftirqd/112:06:121
81910,0rcu_preempt19-21ksoftirqd/111:25:001
81810,0rcu_preempt19-21ksoftirqd/111:20:021
81760,0rcu_preempt3-21ksoftirqd/010:27:250
81760,0rcu_preempt3-21ksoftirqd/010:27:250
81730,0rcu_preempt19-21ksoftirqd/110:16:381
81730,0rcu_preempt19-21ksoftirqd/108:14:541
81720,0rcu_preempt19-21ksoftirqd/110:55:221
81700,0rcu_preempt3-21ksoftirqd/010:07:040
81690,0rcu_preempt3-21ksoftirqd/011:41:550
81680,0rcu_preempt19-21ksoftirqd/111:49:341
81680,0rcu_preempt19-21ksoftirqd/109:57:521
81680,0rcu_preempt19-21ksoftirqd/108:12:301
81670,0rcu_preempt2089-1kworker/0:3H12:04:040
81650,0rcu_preempt54-21kswapd010:46:141
81650,0rcu_preempt3-21ksoftirqd/008:25:000
81650,0rcu_preempt19-21ksoftirqd/111:10:121
81650,0rcu_preempt19-21ksoftirqd/109:15:341
81650,0rcu_preempt19-21ksoftirqd/109:15:341
81650,0rcu_preempt0-21swapper/110:05:511
81640,0rcu_preempt19-21ksoftirqd/109:25:081
81630,0rcu_preempt19-21ksoftirqd/110:53:201
81630,0rcu_preempt19-21ksoftirqd/109:47:531
81620,0rcu_preempt3757-21users11:30:091
81620,0rcu_preempt3-21ksoftirqd/011:44:530
81620,0rcu_preempt19-21ksoftirqd/110:00:291
9950610,0irq/345-4848400181ktimersoftd/112:15:011
81610,0rcu_preempt19-21ksoftirqd/109:09:571
81600,0rcu_preempt19-21ksoftirqd/110:28:311
81600,0rcu_preempt19-21ksoftirqd/110:28:311
81600,0rcu_preempt19-21ksoftirqd/109:39:361
81600,0rcu_preempt19-21ksoftirqd/109:39:361
81600,0rcu_preempt19-21ksoftirqd/108:44:591
81580,0rcu_preempt3-21ksoftirqd/011:21:590
81580,0rcu_preempt3-21ksoftirqd/010:38:210
81580,0rcu_preempt19-21ksoftirqd/111:50:281
9950570,0irq/345-4848400980-21lighttpd08:58:501
81570,0rcu_preempt3-21ksoftirqd/008:00:120
81570,0rcu_preempt19-21ksoftirqd/111:15:051
10050570,0irq/346-48484002683-1kworker/0:1H10:59:530
81560,0rcu_preempt3-21ksoftirqd/011:35:110
81560,0rcu_preempt24317-21kworker/0:010:48:240
81560,0rcu_preempt19-21ksoftirqd/112:26:331
9950550,0irq/345-484840027923-1kworker/1:1H10:30:371
81550,0rcu_preempt7097-21kworker/1:107:59:541
81550,0rcu_preempt19-21ksoftirqd/111:07:251
81540,0rcu_preempt3-21ksoftirqd/011:10:070
81540,0rcu_preempt3-21ksoftirqd/008:44:530
10050540,0irq/346-48484007212-21munin-run11:34:420
9950530,0irq/345-48484000-21swapper/010:12:380
81530,0rcu_preempt3-21ksoftirqd/010:15:070
81530,0rcu_preempt3-21ksoftirqd/009:30:420
81530,0rcu_preempt29241-21ssh09:45:030
10050530,0irq/346-4848400181ktimersoftd/110:13:311
10050530,0irq/346-48484000-21swapper/011:59:250
10050530,0irq/346-48484000-21swapper/009:59:100
81520,0rcu_preempt3-21ksoftirqd/012:15:050
81520,0rcu_preempt3-21ksoftirqd/010:56:120
81520,0rcu_preempt3-21ksoftirqd/010:19:540
81520,0rcu_preempt19-21ksoftirqd/111:59:441
81510,0rcu_preempt7097-21kworker/1:107:45:221
81510,0rcu_preempt3-21ksoftirqd/012:05:110
81510,0rcu_preempt3-21ksoftirqd/011:27:460
81510,0rcu_preempt3-21ksoftirqd/011:14:480
81510,0rcu_preempt3-21ksoftirqd/009:04:430
81510,0rcu_preempt19-21ksoftirqd/110:37:261
81510,0rcu_preempt19-21ksoftirqd/107:43:361
250052510,0chrt9950irq/345-484840012:25:060
9950500,0irq/345-484840021832-1kworker/1:2H12:22:161
81500,0rcu_preempt54-21kswapd012:30:051
81500,0rcu_preempt3-21ksoftirqd/012:38:230
81500,0rcu_preempt3-21ksoftirqd/010:50:060
81500,0rcu_preempt3-21ksoftirqd/008:34:430
81500,0rcu_preempt3-21ksoftirqd/008:20:070
81500,0rcu_preempt3-21ksoftirqd/008:12:540
10050500,0irq/346-48484002683-1kworker/0:1H11:08:040
81490,0rcu_preempt9675-21ssh12:09:550
81490,0rcu_preempt3-21ksoftirqd/009:16:220
81490,0rcu_preempt3-21ksoftirqd/009:16:220
81490,0rcu_preempt3-21ksoftirqd/009:11:270
81490,0rcu_preempt3-21ksoftirqd/008:05:460
81490,0rcu_preempt3094-21ping08:22:461
81490,0rcu_preempt19-21ksoftirqd/112:34:561
81490,0rcu_preempt19-21ksoftirqd/107:34:541
10050490,0irq/346-48484003365-21rm09:51:290
10050490,0irq/346-484840019699-21ssh07:09:580
10050490,0irq/346-4848400181ktimersoftd/110:59:521
9950480,0irq/345-48484000-21swapper/011:50:300
81480,0rcu_preempt54-21kswapd007:50:101
81480,0rcu_preempt3-21ksoftirqd/010:31:410
81480,0rcu_preempt3-21ksoftirqd/009:02:010
81480,0rcu_preempt3-21ksoftirqd/008:59:350
81480,0rcu_preempt3-21ksoftirqd/008:40:100
81480,0rcu_preempt3-21ksoftirqd/007:50:060
81480,0rcu_preempt2018-21kworker/0:009:21:160
81480,0rcu_preempt19-21ksoftirqd/108:05:021
81480,0rcu_preempt14714-1kworker/1:4H11:55:341
9950470,0irq/345-484840017938-21latency_hist10:39:430
81470,0rcu_preempt3-21ksoftirqd/009:40:090
81470,0rcu_preempt3-21ksoftirqd/009:35:500
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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