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2026-07-23 - 11:14

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 Jul 23, 2026 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811230,0rcu_preempt11994-21kworker/0:023:31:430
811230,0rcu_preempt11994-21kworker/0:023:31:430
811140,0rcu_preempt3-21ksoftirqd/021:41:440
811110,0rcu_preempt3-21ksoftirqd/023:59:410
811060,0rcu_preempt3-21ksoftirqd/022:42:290
81980,0rcu_preempt3-21ksoftirqd/022:58:180
81950,0rcu_preempt3-21ksoftirqd/000:24:280
81940,0rcu_preempt3-21ksoftirqd/022:51:510
81910,0rcu_preempt3-21ksoftirqd/021:11:530
81730,0rcu_preempt3-21ksoftirqd/019:12:120
81720,0rcu_preempt3-21ksoftirqd/022:12:170
81720,0rcu_preempt3-21ksoftirqd/022:12:170
81720,0rcu_preempt19447-21apt-get19:07:050
81700,0rcu_preempt3-21ksoftirqd/023:02:430
81690,0rcu_preempt3-21ksoftirqd/023:47:030
81690,0rcu_preempt31975-21cat21:12:150
81670,0rcu_preempt3-21ksoftirqd/022:22:510
81670,0rcu_preempt1426-21munin-node23:07:090
81650,0rcu_preempt3-21ksoftirqd/000:27:130
10050640,0irq/346-484840021131-1kworker/0:0H21:33:490
81630,0rcu_preempt3-21ksoftirqd/019:02:170
81620,0rcu_preempt3446-21munin-node0
81620,0rcu_preempt3-21ksoftirqd/022:21:550
81620,0rcu_preempt19-21ksoftirqd/120:32:091
81620,0rcu_preempt16777-21diskstats22:37:090
10050620,0irq/346-484840023477-1kworker/1:3H23:50:181
81610,0rcu_preempt32427-21ssh22:52:230
81610,0rcu_preempt3-21ksoftirqd/020:17:200
81610,0rcu_preempt22575-21ping19:22:240
81610,0rcu_preempt17626-21ssh00:17:120
81600,0rcu_preempt3-21ksoftirqd/021:46:460
81600,0rcu_preempt3-21ksoftirqd/019:46:340
81600,0rcu_preempt20134-21php-cgi20:47:150
10050600,0irq/346-484840054-21kswapd023:26:231
10050600,0irq/346-484840013597-1kworker/1:1H22:00:581
81590,0rcu_preempt3-21ksoftirqd/020:32:070
81590,0rcu_preempt3-21ksoftirqd/019:52:060
10050590,0irq/346-484840054-21kswapd000:14:101
81580,0rcu_preempt0-21swapper/022:01:480
10050580,0irq/346-484840054-21kswapd022:26:341
10050580,0irq/346-48484003681-1kworker/1:0H23:31:041
10050580,0irq/346-48484003681-1kworker/1:0H23:31:041
10050580,0irq/346-484840031954-1kworker/1:1H22:20:101
81570,0rcu_preempt3-21ksoftirqd/020:12:190
19297995721,0cyclictest23722-21apt-get23:17:070
19297995721,0cyclictest17162-21munin-node0
19297995721,0cyclictest17162-21munin-node0
19297995718,0cyclictest6263-1kworker/0:0H21:22:170
81560,0rcu_preempt4860-21kworker/0:220:02:120
81560,0rcu_preempt3-21ksoftirqd/023:42:170
81560,0rcu_preempt3-21ksoftirqd/023:22:160
81560,0rcu_preempt3-21ksoftirqd/022:06:560
81560,0rcu_preempt3-21ksoftirqd/019:47:170
81560,0rcu_preempt19-21ksoftirqd/119:40:091
19297995617,0cyclictest0-21swapper/000:10:120
10050560,0irq/346-484840013894-1kworker/1:2H22:38:001
81550,0rcu_preempt3-21ksoftirqd/023:52:160
81550,0rcu_preempt3-21ksoftirqd/023:52:160
81550,0rcu_preempt3-21ksoftirqd/000:12:300
81550,0rcu_preempt18861-21aten_rapower_en23:12:090
19297995521,0cyclictest6967-21ssh23:32:210
19297995521,0cyclictest6967-21ssh23:32:210
81540,0rcu_preempt8184-21kworker/0:221:49:120
81540,0rcu_preempt3-21ksoftirqd/021:52:080
81540,0rcu_preempt3-21ksoftirqd/021:02:180
81540,0rcu_preempt14355-21kworker/0:120:41:180
19297995416,0cyclictest13893-1kworker/0:2H22:35:410
10050540,0irq/346-484840031093-1kworker/1:0H21:52:571
10050540,0irq/346-484840011193-1kworker/1:0H21:23:411
81530,0rcu_preempt6538-21kworker/0:020:07:180
81530,0rcu_preempt3-21ksoftirqd/020:22:230
81530,0rcu_preempt25768-21kworker/0:100:06:000
81520,0rcu_preempt54-21kswapd023:21:201
19297995218,0cyclictest9523-21runrttasks22:28:150
10250520,0irq/333-mmc00-21swapper/020:42:130
10050520,0irq/346-48484001272-1kworker/1:0H21:13:511
81510,0rcu_preempt3-21ksoftirqd/023:39:190
81510,0rcu_preempt3-21ksoftirqd/020:52:170
1929899512,0cyclictest19350-21munin-node1
19297995120,0cyclictest951-21uptime00:32:250
19297995118,0cyclictest0-21swapper/021:16:560
19297995118,0cyclictest0-21swapper/021:16:560
19297995117,0cyclictest22575-21ping19:27:100
81500,0rcu_preempt3-21ksoftirqd/020:57:050
81500,0rcu_preempt19-21ksoftirqd/123:38:451
81500,0rcu_preempt19-21ksoftirqd/122:07:201
10050500,0irq/346-48484002685-21ssh21:47:251
81490,0rcu_preempt19-21ksoftirqd/120:07:241
19297994918,0cyclictest13763-21wc21:26:550
19297994916,0cyclictest22575-21ping19:17:200
81480,0rcu_preempt19-21ksoftirqd/100:19:051
19297994722,0cyclictest22575-21ping19:32:070
19297994721,0cyclictest22575-21ping19:37:070
81460,0rcu_preempt19-21ksoftirqd/120:12:051
81450,0rcu_preempt26286-21diskmemload23:52:231
81450,0rcu_preempt26286-21diskmemload23:52:231
81450,0rcu_preempt26286-21diskmemload00:06:571
81450,0rcu_preempt19-21ksoftirqd/100:32:331
1929899459,0cyclictest3960-21ssh22:57:071
19298994514,0cyclictest10050irq/346-484840022:12:141
19298994514,0cyclictest10050irq/346-484840022:12:141
19298994512,0cyclictest0-21swapper/123:02:061
19297994518,0cyclictest14773-21munin-plugin-st20:31:550
81440,0rcu_preempt19-21ksoftirqd/123:46:511
81440,0rcu_preempt19-21ksoftirqd/122:29:351
81440,0rcu_preempt19-21ksoftirqd/100:01:201
81430,0rcu_preempt19-21ksoftirqd/122:45:301
81430,0rcu_preempt19-21ksoftirqd/122:02:371
81430,0rcu_preempt19-21ksoftirqd/122:02:371
81430,0rcu_preempt19-21ksoftirqd/121:39:061
81430,0rcu_preempt19-21ksoftirqd/100:28:061
1929899438,0cyclictest12623-21unixbench_multi20:22:251
19298994312,0cyclictest15157-21ssh23:07:311
81420,0rcu_preempt19-21ksoftirqd/119:42:131
81420,0rcu_preempt19-21ksoftirqd/119:22:041
81420,0rcu_preempt19-21ksoftirqd/119:07:071
1929899429,0cyclictest15742-21ssh22:36:161
10050420,0irq/346-484840014288-21ssh21:27:131
81410,0rcu_preempt26286-21diskmemload21:09:341
81410,0rcu_preempt26286-21diskmemload00:24:251
81410,0rcu_preempt19-21ksoftirqd/122:47:061
81410,0rcu_preempt19-21ksoftirqd/121:42:171
19298994111,0cyclictest1470-21runrttasks20:02:361
81400,0rcu_preempt28785-1kworker/1:2H22:53:001
81400,0rcu_preempt19-21ksoftirqd/123:32:371
81400,0rcu_preempt19-21ksoftirqd/123:32:371
81400,0rcu_preempt19-21ksoftirqd/120:37:211
81400,0rcu_preempt19-21ksoftirqd/120:01:551
81400,0rcu_preempt19-21ksoftirqd/119:47:101
10050400,0irq/346-484840025970-1kworker/1:2H21:17:261
10050400,0irq/346-484840025970-1kworker/1:2H21:17:261
81390,0rcu_preempt19-21ksoftirqd/123:12:501
81390,0rcu_preempt19-21ksoftirqd/121:06:551
81390,0rcu_preempt19-21ksoftirqd/119:32:161
81390,0rcu_preempt19-21ksoftirqd/100:03:161
81380,0rcu_preempt19-21ksoftirqd/120:47:131
81370,0rcu_preempt19-21ksoftirqd/119:27:051
81370,0rcu_preempt19-21ksoftirqd/119:17:141
81370,0rcu_preempt19-21ksoftirqd/119:02:291
81360,0rcu_preempt19-21ksoftirqd/120:52:591
81360,0rcu_preempt19-21ksoftirqd/120:44:591
81360,0rcu_preempt19-21ksoftirqd/120:27:121
81360,0rcu_preempt19-21ksoftirqd/120:17:191
81350,0rcu_preempt19-21ksoftirqd/120:57:221
81350,0rcu_preempt19-21ksoftirqd/119:12:161
81340,0rcu_preempt19-21ksoftirqd/119:51:551
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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