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2026-03-17 - 22:40

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 Tue Mar 17, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811290,0rcu_preempt3-21ksoftirqd/011:42:380
81960,0rcu_preempt3-21ksoftirqd/011:35:440
81840,0rcu_preempt19-21ksoftirqd/109:22:541
81750,0rcu_preempt19-21ksoftirqd/110:39:231
81730,0rcu_preempt54-21kswapd011:12:401
81730,0rcu_preempt54-21kswapd009:42:571
81730,0rcu_preempt0-21swapper/110:21:421
81710,0rcu_preempt19-21ksoftirqd/112:00:051
81700,0rcu_preempt3-21ksoftirqd/010:52:080
81680,0rcu_preempt3-21ksoftirqd/011:26:230
81680,0rcu_preempt22097-21cyclictest11:04:130
81670,0rcu_preempt54-21kswapd009:35:491
10050670,0irq/346-48484000-21swapper/012:38:370
81660,0rcu_preempt54-21kswapd011:59:400
81660,0rcu_preempt3-21ksoftirqd/010:34:260
81660,0rcu_preempt19-21ksoftirqd/110:05:021
10050660,0irq/346-4848400171rcuc/110:54:161
81650,0rcu_preempt3-21ksoftirqd/007:09:110
10050650,0irq/346-4848400171rcuc/110:48:471
81640,0rcu_preempt3-21ksoftirqd/010:04:170
81640,0rcu_preempt29075-1kworker/0:3H09:49:260
81640,0rcu_preempt19-21ksoftirqd/110:52:211
81640,0rcu_preempt19-21ksoftirqd/107:39:111
81640,0rcu_preempt19-21ksoftirqd/107:24:171
10050640,0irq/346-484840019673-21munin-node0
10050640,0irq/346-484840019-21ksoftirqd/111:39:111
81630,0rcu_preempt28728-21kworker/0:111:54:090
81630,0rcu_preempt19-21ksoftirqd/109:51:001
81620,0rcu_preempt3-21ksoftirqd/008:29:200
10050620,0irq/346-4848400171rcuc/112:27:551
10050620,0irq/346-48484000-21swapper/011:30:380
81610,0rcu_preempt19-21ksoftirqd/112:30:301
81610,0rcu_preempt19-21ksoftirqd/111:14:231
10050610,0irq/346-4848400181ktimersoftd/109:57:121
10050610,0irq/346-4848400171rcuc/109:24:231
9950600,0irq/345-484840081rcu_preempt11:03:371
81600,0rcu_preempt3-21ksoftirqd/011:18:440
10050600,0irq/346-48484000-21swapper/011:48:440
10050600,0irq/346-48484000-21swapper/010:12:090
9950590,0irq/345-4848400181ktimersoftd/112:09:271
81590,0rcu_preempt3-21ksoftirqd/012:19:130
81590,0rcu_preempt3-21ksoftirqd/012:04:210
10050590,0irq/346-484840031303-1kworker/1:0H11:25:111
81580,0rcu_preempt3-21ksoftirqd/008:39:130
81580,0rcu_preempt19-21ksoftirqd/112:06:531
81580,0rcu_preempt19-21ksoftirqd/110:24:021
81580,0rcu_preempt0-21swapper/109:18:271
10050580,0irq/346-48484003574-21php-cgi09:48:300
10050580,0irq/346-4848400171rcuc/112:14:331
10050580,0irq/346-484840011637-1kworker/0:2H10:01:390
9950570,0irq/345-4848400181ktimersoftd/111:34:461
81570,0rcu_preempt19-21ksoftirqd/111:54:391
10050570,0irq/346-484840026323-1kworker/0:0H11:20:580
10050570,0irq/346-48484000-21swapper/009:24:430
10050570,0irq/346-48484000-21swapper/009:11:520
81560,0rcu_preempt19-21ksoftirqd/110:29:551
10050560,0irq/346-484840019-21ksoftirqd/111:44:311
10050560,0irq/346-4848400171rcuc/110:35:081
10050560,0irq/346-4848400171rcuc/109:10:371
10050560,0irq/346-48484000-21swapper/011:53:070
9950550,0irq/345-48484004098-21munin-node0
81550,0rcu_preempt5906-21ping08:19:230
81550,0rcu_preempt3-21ksoftirqd/007:04:190
81550,0rcu_preempt28457-21apt-get12:24:090
81550,0rcu_preempt26497-21kworker/0:210:19:300
9950540,0irq/345-48484006496-21apt-get10:24:080
9950540,0irq/345-48484001914-21grep12:29:250
9950540,0irq/345-4848400171rcuc/109:46:591
81540,0rcu_preempt3-21ksoftirqd/009:04:090
81540,0rcu_preempt3-21ksoftirqd/008:34:140
81540,0rcu_preempt19-21ksoftirqd/111:31:471
81540,0rcu_preempt19-21ksoftirqd/109:59:251
81540,0rcu_preempt0-21swapper/111:50:591
10050540,0irq/346-484840026398-21run-parts09:38:570
10050540,0irq/346-48484000-21swapper/009:14:240
9950530,0irq/345-4848400171rcuc/112:36:501
9950530,0irq/345-484840013960-1kworker/0:1H10:33:280
81530,0rcu_preempt3-21ksoftirqd/010:42:300
81530,0rcu_preempt3-21ksoftirqd/009:39:170
81530,0rcu_preempt19-21ksoftirqd/107:59:081
10050530,0irq/346-484840054-21kswapd012:17:010
10050530,0irq/346-48484000-21swapper/010:59:540
9950520,0irq/345-4848400181ktimersoftd/110:16:321
9950520,0irq/345-4848400171rcuc/111:20:271
9950520,0irq/345-48484001246-21munin-run10:18:570
9950520,0irq/345-48484000-21swapper/009:57:050
81520,0rcu_preempt3-21ksoftirqd/008:44:200
81520,0rcu_preempt3-21ksoftirqd/007:39:140
10050520,0irq/346-48484000-21swapper/009:20:110
81510,0rcu_preempt9472-21kworker/0:108:14:220
81510,0rcu_preempt3-21ksoftirqd/009:29:250
81510,0rcu_preempt3-21ksoftirqd/007:49:070
81510,0rcu_preempt19-21ksoftirqd/107:54:161
10050510,0irq/346-484840026975-1kworker/0:0H10:44:580
10050510,0irq/346-4848400181ktimersoftd/110:10:441
81500,0rcu_preempt5007-21kworker/0:008:00:080
81500,0rcu_preempt3-21ksoftirqd/008:26:140
81500,0rcu_preempt19-21ksoftirqd/111:07:301
81500,0rcu_preempt19-21ksoftirqd/108:24:231
10050500,0irq/346-484840016648-21ssh12:11:550
81490,0rcu_preempt5906-21ping08:09:270
81490,0rcu_preempt3-21ksoftirqd/007:54:220
9950480,0irq/345-4848400171rcuc/108:05:411
81480,0rcu_preempt3-21ksoftirqd/008:49:190
81480,0rcu_preempt3-21ksoftirqd/007:29:180
81480,0rcu_preempt19-21ksoftirqd/108:14:261
81480,0rcu_preempt16764-21apt-get09:29:091
81480,0rcu_preempt15543-21kworker/1:108:32:531
81470,0rcu_preempt3-21ksoftirqd/008:03:580
4350470,0irq/32-433000001510-21dropbear07:44:130
4350470,0irq/32-433000001510-21dropbear07:44:130
81460,0rcu_preempt3-21ksoftirqd/007:14:090
81460,0rcu_preempt19-21ksoftirqd/112:22:261
81460,0rcu_preempt19-21ksoftirqd/108:12:201
9950450,0irq/345-484840027029-21munin-run07:23:590
81440,0rcu_preempt54-21kswapd007:36:560
81440,0rcu_preempt26179-21diskstats08:59:130
81440,0rcu_preempt26179-21diskstats08:59:130
81440,0rcu_preempt24510-21df_inode08:54:140
81440,0rcu_preempt19-21ksoftirqd/109:04:131
81440,0rcu_preempt19-21ksoftirqd/108:44:091
81440,0rcu_preempt19-21ksoftirqd/107:36:491
81430,0rcu_preempt19-21ksoftirqd/108:59:081
81430,0rcu_preempt19-21ksoftirqd/108:59:081
10050430,0irq/346-484840020878-21/usr/sbin/munin08:43:571
81420,0rcu_preempt19-21ksoftirqd/107:51:281
81420,0rcu_preempt19-21ksoftirqd/107:44:081
81420,0rcu_preempt19-21ksoftirqd/107:44:081
81420,0rcu_preempt19-21ksoftirqd/107:32:151
81410,0rcu_preempt19-21ksoftirqd/108:54:101
22098994113,0cyclictest0-21swapper/007:24:270
81400,0rcu_preempt19-21ksoftirqd/107:23:581
81390,0rcu_preempt19-21ksoftirqd/108:19:161
81390,0rcu_preempt19-21ksoftirqd/107:18:101
81370,0rcu_preempt22003-21runrttasks07:08:161
81370,0rcu_preempt19-21ksoftirqd/108:50:061
81370,0rcu_preempt19-21ksoftirqd/107:09:271
81360,0rcu_preempt19-21ksoftirqd/108:35:321
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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