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2026-07-04 - 17:26

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 Sat Jul 04, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811130,0rcu_preempt3-21ksoftirqd/011:32:370
81860,0rcu_preempt19-21ksoftirqd/109:55:401
81830,0rcu_preempt11269-21kworker/1:010:14:451
9950780,0irq/345-4848400171rcuc/111:36:541
10050780,0irq/346-4848400171rcuc/112:23:581
81770,0rcu_preempt9950irq/345-484840009:30:581
81770,0rcu_preempt9950irq/345-484840009:30:581
81770,0rcu_preempt19-21ksoftirqd/111:05:521
81750,0rcu_preempt19-21ksoftirqd/110:54:561
81730,0rcu_preempt19-21ksoftirqd/111:50:331
10050720,0irq/346-484840030686-1kworker/0:2H10:46:360
10050720,0irq/346-484840013092-1kworker/0:0H11:01:300
10050710,0irq/346-48484007105-1kworker/0:3H09:14:340
81700,0rcu_preempt3-21ksoftirqd/009:36:060
81700,0rcu_preempt19-21ksoftirqd/109:26:381
81700,0rcu_preempt19-21ksoftirqd/109:18:131
81700,0rcu_preempt19-21ksoftirqd/109:18:131
81700,0rcu_preempt19-21ksoftirqd/109:11:221
81690,0rcu_preempt54-21kswapd010:40:050
81690,0rcu_preempt19-21ksoftirqd/112:04:151
81690,0rcu_preempt19-21ksoftirqd/110:34:151
81690,0rcu_preempt19-21ksoftirqd/109:45:251
81690,0rcu_preempt19-21ksoftirqd/108:02:411
81680,0rcu_preempt54-21kswapd010:19:141
81680,0rcu_preempt19-21ksoftirqd/111:43:511
10050680,0irq/346-48484008966-1kworker/0:0H10:13:430
81670,0rcu_preempt6926-21kworker/1:111:41:121
81670,0rcu_preempt54-21kswapd011:39:360
81670,0rcu_preempt19-21ksoftirqd/111:17:471
81670,0rcu_preempt19-21ksoftirqd/110:00:281
81670,0rcu_preempt19-21ksoftirqd/108:12:241
81660,0rcu_preempt19-21ksoftirqd/109:50:301
81660,0rcu_preempt19-21ksoftirqd/109:33:381
81650,0rcu_preempt54-21kswapd007:27:230
81640,0rcu_preempt19-21ksoftirqd/108:32:221
81630,0rcu_preempt3-21ksoftirqd/011:30:040
81630,0rcu_preempt3-21ksoftirqd/011:09:110
81630,0rcu_preempt3-21ksoftirqd/010:31:420
81630,0rcu_preempt22947-1kworker/1:0H11:31:261
81630,0rcu_preempt19-21ksoftirqd/110:40:271
81630,0rcu_preempt19-21ksoftirqd/110:02:241
81630,0rcu_preempt0-21swapper/110:58:571
81620,0rcu_preempt3-21ksoftirqd/009:09:570
81620,0rcu_preempt19-21ksoftirqd/112:27:481
81620,0rcu_preempt19-21ksoftirqd/112:08:541
9950610,0irq/345-4848400181ktimersoftd/110:25:581
81610,0rcu_preempt9920-21ping08:07:361
81610,0rcu_preempt54-21kswapd011:10:141
81610,0rcu_preempt30588-21apt-get09:02:241
81610,0rcu_preempt19-21ksoftirqd/111:57:351
81600,0rcu_preempt3-21ksoftirqd/012:23:530
81600,0rcu_preempt3-21ksoftirqd/011:51:520
81600,0rcu_preempt3-21ksoftirqd/009:26:320
81600,0rcu_preempt25409-21ssh11:12:241
81600,0rcu_preempt25087-21cyclictest12:14:411
81600,0rcu_preempt25087-21cyclictest12:14:411
81600,0rcu_preempt19-21ksoftirqd/112:33:471
81600,0rcu_preempt19-21ksoftirqd/108:52:351
81590,0rcu_preempt19-21ksoftirqd/110:45:381
81590,0rcu_preempt19-21ksoftirqd/108:27:231
81590,0rcu_preempt19-21ksoftirqd/108:17:261
81590,0rcu_preempt19-21ksoftirqd/108:01:001
81580,0rcu_preempt54-21kswapd011:17:200
81580,0rcu_preempt3-21ksoftirqd/010:52:350
81580,0rcu_preempt19-21ksoftirqd/111:24:081
81580,0rcu_preempt19-21ksoftirqd/110:29:301
81580,0rcu_preempt19-21ksoftirqd/110:09:361
81570,0rcu_preempt19-21ksoftirqd/111:52:251
81570,0rcu_preempt19-21ksoftirqd/111:52:251
81570,0rcu_preempt19-21ksoftirqd/108:57:311
81570,0rcu_preempt19-21ksoftirqd/108:23:161
81560,0rcu_preempt3-21ksoftirqd/008:02:410
81560,0rcu_preempt1067-21lighttpd09:13:201
81550,0rcu_preempt3-21ksoftirqd/010:02:250
81550,0rcu_preempt3-21ksoftirqd/008:12:230
81540,0rcu_preempt19-21ksoftirqd/108:42:361
10050540,0irq/346-48484000-21swapper/009:27:230
10050540,0irq/346-48484000-21swapper/009:27:230
10050530,0irq/346-484840012256-1kworker/0:2H12:12:220
10050530,0irq/346-484840012256-1kworker/0:2H12:12:220
81520,0rcu_preempt25816-21memory07:07:351
9950510,0irq/345-484840024969-1kworker/0:3H11:45:390
81500,0rcu_preempt30346-21ssh09:37:411
81500,0rcu_preempt30346-21ssh09:37:411
10050500,0irq/346-48484000-21swapper/107:42:321
81490,0rcu_preempt3-21ksoftirqd/008:17:390
81490,0rcu_preempt3-21ksoftirqd/008:07:240
81490,0rcu_preempt32072-21diskmemload12:17:261
81490,0rcu_preempt32072-21diskmemload10:49:391
81490,0rcu_preempt25935-21kworker/0:009:41:220
81490,0rcu_preempt25935-21kworker/0:009:41:220
81490,0rcu_preempt19-21ksoftirqd/107:55:071
81490,0rcu_preempt19-21ksoftirqd/107:12:371
55232490,0chrt10050irq/346-484840007:44:210
81480,0rcu_preempt19-21ksoftirqd/108:37:361
81470,0rcu_preempt3-21ksoftirqd/010:26:390
81470,0rcu_preempt3-21ksoftirqd/008:02:120
81470,0rcu_preempt19-21ksoftirqd/107:19:271
298282470,0chrt10050irq/346-484840007:20:150
276392470,0chrt9950irq/345-484840010:07:480
10050470,0irq/346-48484005318-1kworker/0:0H11:24:560
81460,0rcu_preempt3-21ksoftirqd/009:17:240
81460,0rcu_preempt3-21ksoftirqd/009:17:240
81460,0rcu_preempt3-21ksoftirqd/008:27:240
81460,0rcu_preempt15397-21kworker/0:010:34:220
10050460,0irq/346-484840054-21kswapd010:52:120
10050460,0irq/346-484840016373-21ssh12:08:240
81450,0rcu_preempt3-21ksoftirqd/011:57:360
81450,0rcu_preempt3-21ksoftirqd/011:02:340
81450,0rcu_preempt19-21ksoftirqd/107:36:571
81450,0rcu_preempt19-21ksoftirqd/107:31:591
10050450,0irq/346-484840041ktimersoftd/012:33:430
10050450,0irq/346-484840019365-1kworker/0:0H07:02:320
10050450,0irq/346-484840019365-1kworker/0:0H07:02:320
10050450,0irq/346-484840013885-1kworker/0:1H09:55:390
10050450,0irq/346-484840012015-21ssh12:04:090
81440,0rcu_preempt3-21ksoftirqd/011:52:260
81440,0rcu_preempt3-21ksoftirqd/011:52:260
81440,0rcu_preempt19-21ksoftirqd/108:47:401
81440,0rcu_preempt19-21ksoftirqd/107:39:431
10050440,0irq/346-484840031900-1kworker/0:2H12:27:310
10050440,0irq/346-48484001150-1kworker/0:3H10:17:240
81430,0rcu_preempt3-21ksoftirqd/009:57:370
81430,0rcu_preempt19-21ksoftirqd/107:22:181
10050430,0irq/346-484840026918-21sh11:13:060
9950420,0irq/345-48484000-21swapper/009:47:090
81420,0rcu_preempt6651-21munin-node0
81420,0rcu_preempt4128-21php-cgi07:41:570
81420,0rcu_preempt3-21ksoftirqd/009:07:120
81420,0rcu_preempt3-21ksoftirqd/007:07:350
81410,0rcu_preempt3-21ksoftirqd/012:17:230
81410,0rcu_preempt3-21ksoftirqd/008:42:360
81410,0rcu_preempt3-21ksoftirqd/008:22:330
81410,0rcu_preempt19-21ksoftirqd/107:47:291
81400,0rcu_preempt3-21ksoftirqd/008:47:340
81400,0rcu_preempt3-21ksoftirqd/008:32:270
10050400,0irq/346-484840030433-21ls09:02:120
81390,0rcu_preempt3-21ksoftirqd/008:37:290
81390,0rcu_preempt3-21ksoftirqd/007:52:180
81390,0rcu_preempt24250-21ntp_states07:02:341
81390,0rcu_preempt24250-21ntp_states07:02:341
280492390,0chrt28021-1kworker/0:2H07:13:590
81380,0rcu_preempt3-21ksoftirqd/008:52:330
81380,0rcu_preempt3-21ksoftirqd/007:47:420
25089993810,0cyclictest28369-21ping07:22:250
81370,0rcu_preempt3-21ksoftirqd/007:32:370
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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