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2026-05-18 - 16:28

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 May 18, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81710,0rcu_preempt3-21ksoftirqd/011:33:270
81660,0rcu_preempt3-21ksoftirqd/009:28:260
81660,0rcu_preempt3-21ksoftirqd/009:28:260
81650,0rcu_preempt851-21rngd09:55:260
81640,0rcu_preempt3-21ksoftirqd/010:52:580
81630,0rcu_preempt29147-21ntp_states11:28:240
106162630,0chrt9950irq/345-484840012:15:301
10050620,0irq/346-484840054-21kswapd009:33:121
10050620,0irq/346-484840014538-21munin-node0
81560,0rcu_preempt19-21ksoftirqd/109:49:271
10050560,0irq/346-484840054-21kswapd012:01:451
81550,0rcu_preempt3-21ksoftirqd/012:18:220
81550,0rcu_preempt3-21ksoftirqd/009:43:180
81550,0rcu_preempt3-21ksoftirqd/007:08:240
81550,0rcu_preempt29854-21kworker/0:011:13:240
81540,0rcu_preempt3-21ksoftirqd/012:23:090
81540,0rcu_preempt3-21ksoftirqd/012:13:140
81540,0rcu_preempt3-21ksoftirqd/010:38:180
81540,0rcu_preempt3-21ksoftirqd/010:13:090
81540,0rcu_preempt3-21ksoftirqd/009:18:170
81540,0rcu_preempt3-21ksoftirqd/007:03:170
81530,0rcu_preempt3-21ksoftirqd/011:58:230
81530,0rcu_preempt3-21ksoftirqd/011:56:340
81530,0rcu_preempt3-21ksoftirqd/011:56:340
81530,0rcu_preempt3-21ksoftirqd/011:45:540
81530,0rcu_preempt3-21ksoftirqd/011:25:570
81530,0rcu_preempt3-21ksoftirqd/008:48:070
81530,0rcu_preempt3-21ksoftirqd/008:18:090
81530,0rcu_preempt3-21ksoftirqd/008:18:090
81530,0rcu_preempt28745-21ping08:03:090
10050530,0irq/346-484840054-21kswapd012:11:531
10050530,0irq/346-484840030847-1kworker/1:2H11:49:351
81520,0rcu_preempt3-21ksoftirqd/011:08:270
81520,0rcu_preempt3-21ksoftirqd/008:00:110
81520,0rcu_preempt29773-21memory10:23:210
81520,0rcu_preempt19-21ksoftirqd/111:37:171
81510,0rcu_preempt3-21ksoftirqd/011:38:090
81510,0rcu_preempt3-21ksoftirqd/010:58:170
81510,0rcu_preempt3-21ksoftirqd/009:41:590
81510,0rcu_preempt3-21ksoftirqd/009:33:100
81510,0rcu_preempt3-21ksoftirqd/009:10:070
81510,0rcu_preempt3-21ksoftirqd/009:10:070
81510,0rcu_preempt29854-21kworker/0:010:46:150
81510,0rcu_preempt29319-21kworker/0:209:27:340
81510,0rcu_preempt28745-21ping08:13:080
81510,0rcu_preempt15011-21kworker/0:011:49:420
9950500,0irq/345-48484000-21swapper/012:12:120
81500,0rcu_preempt3-21ksoftirqd/010:53:150
81500,0rcu_preempt3-21ksoftirqd/010:53:150
81500,0rcu_preempt3-21ksoftirqd/009:48:190
81500,0rcu_preempt3-21ksoftirqd/008:23:110
81500,0rcu_preempt3-21ksoftirqd/008:08:240
81500,0rcu_preempt27471-21ssh12:33:100
81500,0rcu_preempt24836-21expr07:43:270
81500,0rcu_preempt19-21ksoftirqd/108:04:011
10050500,0irq/346-484840054-21kswapd009:58:210
81490,0rcu_preempt3-21ksoftirqd/010:03:170
81490,0rcu_preempt3-21ksoftirqd/008:59:530
81490,0rcu_preempt3-21ksoftirqd/008:53:260
81490,0rcu_preempt3-21ksoftirqd/008:53:260
81490,0rcu_preempt3-21ksoftirqd/008:28:200
81490,0rcu_preempt25545-21sh09:13:240
81480,0rcu_preempt3-21ksoftirqd/012:06:280
81480,0rcu_preempt3-21ksoftirqd/011:03:070
81480,0rcu_preempt3-21ksoftirqd/011:03:070
81480,0rcu_preempt3-21ksoftirqd/010:33:210
81480,0rcu_preempt3-21ksoftirqd/010:33:210
81480,0rcu_preempt3-21ksoftirqd/010:18:230
81480,0rcu_preempt3-21ksoftirqd/008:38:220
81480,0rcu_preempt3-21ksoftirqd/007:48:140
10050480,0irq/346-48484000-21swapper/010:31:510
81470,0rcu_preempt3-21ksoftirqd/012:28:090
81470,0rcu_preempt3-21ksoftirqd/008:43:110
81470,0rcu_preempt19-21ksoftirqd/111:32:081
81470,0rcu_preempt19-21ksoftirqd/109:25:191
81470,0rcu_preempt19-21ksoftirqd/109:17:071
81470,0rcu_preempt19-21ksoftirqd/108:16:391
81470,0rcu_preempt19-21ksoftirqd/107:55:581
10050470,0irq/346-484840027479-21apt07:53:080
10050470,0irq/346-48484000-21swapper/111:23:231
81460,0rcu_preempt19-21ksoftirqd/108:08:191
81460,0rcu_preempt19-21ksoftirqd/107:59:481
81460,0rcu_preempt14606-21php-cgi07:13:160
222822460,0chrt10050irq/346-484840007:36:510
10050460,0irq/346-484840019894-21ssh11:18:410
81450,0rcu_preempt19-21ksoftirqd/109:54:041
81440,0rcu_preempt19-21ksoftirqd/111:40:571
81440,0rcu_preempt19-21ksoftirqd/108:22:491
81440,0rcu_preempt19-21ksoftirqd/108:22:491
10050440,0irq/346-484840014846-21ssh11:47:171
81430,0rcu_preempt8204-21apt-get08:33:110
81430,0rcu_preempt54-21kswapd011:01:131
81430,0rcu_preempt54-21kswapd010:49:161
81430,0rcu_preempt3-21ksoftirqd/009:05:170
81430,0rcu_preempt3-21ksoftirqd/007:23:310
81430,0rcu_preempt19570-21diskmemload09:43:281
81430,0rcu_preempt19-21ksoftirqd/111:10:501
81430,0rcu_preempt19-21ksoftirqd/110:31:341
81430,0rcu_preempt19-21ksoftirqd/109:30:541
81430,0rcu_preempt19-21ksoftirqd/109:30:541
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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