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2026-04-14 - 09:37

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 highest latencies:
System rackaslot5s.osadl.org (updated Tue Apr 14, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81970,0rcu_preempt19-21ksoftirqd/121:09:041
81930,0rcu_preempt3-21ksoftirqd/021:14:570
81850,0rcu_preempt19-21ksoftirqd/120:28:471
81800,0rcu_preempt15940-1kworker/1:0H23:03:321
81770,0rcu_preempt11858-1kworker/1:3H21:53:321
81670,0rcu_preempt19-21ksoftirqd/120:43:311
81670,0rcu_preempt11036-1kworker/1:1H22:58:311
81640,0rcu_preempt3-21ksoftirqd/021:23:320
81610,0rcu_preempt19-21ksoftirqd/123:53:481
81610,0rcu_preempt19-21ksoftirqd/100:03:561
10050570,0irq/346-484840023867-1kworker/0:2H21:33:440
81550,0rcu_preempt19-21ksoftirqd/119:03:491
10050550,0irq/346-484840022164-1kworker/0:0H23:40:360
10050550,0irq/346-484840022164-1kworker/0:0H23:40:360
81540,0rcu_preempt6075-1kworker/0:0H22:51:410
81540,0rcu_preempt19-21ksoftirqd/123:23:431
81540,0rcu_preempt19-21ksoftirqd/122:23:561
10050540,0irq/346-48484007138-1kworker/0:0H00:00:490
10050540,0irq/346-484840027841-1kworker/0:2H23:55:050
10050540,0irq/346-484840017223-1kworker/0:1H23:37:530
81530,0rcu_preempt3-21ksoftirqd/021:53:490
81530,0rcu_preempt19-21ksoftirqd/122:03:411
81530,0rcu_preempt19-21ksoftirqd/122:03:411
10050530,0irq/346-48484006075-1kworker/0:0H22:57:460
10050520,0irq/346-484840024230-1kworker/0:1H00:16:080
81510,0rcu_preempt3-21ksoftirqd/023:43:510
81510,0rcu_preempt3-21ksoftirqd/022:39:000
81510,0rcu_preempt19-21ksoftirqd/123:39:001
81510,0rcu_preempt19-21ksoftirqd/123:39:001
81510,0rcu_preempt19-21ksoftirqd/121:58:561
81510,0rcu_preempt19-21ksoftirqd/121:43:321
81510,0rcu_preempt19-21ksoftirqd/100:33:541
10050510,0irq/346-484840015941-1kworker/0:3H23:04:310
81500,0rcu_preempt3-21ksoftirqd/021:44:020
81500,0rcu_preempt19-21ksoftirqd/121:28:491
2766899501,0cyclictest10050irq/346-484840022:12:300
10050500,0irq/346-48484006602-1kworker/0:1H00:31:190
10050500,0irq/346-48484001516-1kworker/0:0H19:28:550
10050500,0irq/346-48484000-21swapper/022:45:170
81490,0rcu_preempt3-21ksoftirqd/000:18:480
10050490,0irq/346-48484000-21swapper/023:21:310
9950480,0irq/345-48484004355-21taskset22:16:120
9950480,0irq/345-48484004355-21taskset22:16:120
9950480,0irq/345-48484001976-1kworker/0:0H21:08:520
81480,0rcu_preempt19-21ksoftirqd/120:33:571
81470,0rcu_preempt3-21ksoftirqd/021:48:320
81470,0rcu_preempt3-21ksoftirqd/019:03:470
81470,0rcu_preempt19-21ksoftirqd/123:09:151
10050470,0irq/346-4848400181ktimersoftd/122:48:071
10050470,0irq/346-484840011208-21munin-node0
10050470,0irq/346-48484000-21swapper/022:33:530
10050470,0irq/346-48484000-21swapper/022:33:530
81460,0rcu_preempt9243-21ps19:48:561
81460,0rcu_preempt2266-21diskmemload22:29:061
10050460,0irq/346-484840019166-21munin-node0
10050460,0irq/346-48484000-21swapper/022:07:500
10050460,0irq/346-48484000-21swapper/022:07:500
9950450,0irq/345-48484000-21swapper/023:01:060
81450,0rcu_preempt2266-21diskmemload23:28:441
1699450,0migration/11005-21munin-node1
10050450,0irq/346-48484006602-1kworker/0:1H00:34:360
10050450,0irq/346-48484006436-1kworker/0:2H19:43:520
10050450,0irq/346-48484006436-1kworker/0:2H19:43:520
10050450,0irq/346-484840031403-21sendmail-msp20:58:310
10050450,0irq/346-48484002868-21ssh00:26:400
10050450,0irq/346-484840028009-21munin-node0
10050450,0irq/346-484840018639-21ssh21:24:110
10050450,0irq/346-48484000-21swapper/023:31:550
10050450,0irq/346-48484000-21swapper/021:42:220
10050450,0irq/346-48484000-21swapper/020:09:000
9950440,0irq/345-484840010208-1kworker/0:3H00:07:160
81440,0rcu_preempt30607-21ps20:53:561
81440,0rcu_preempt19-21ksoftirqd/122:13:431
81440,0rcu_preempt19-21ksoftirqd/122:13:431
81440,0rcu_preempt19-21ksoftirqd/120:23:471
10050440,0irq/346-48484006801-21ssh22:18:490
10050440,0irq/346-484840026460-21munin-run20:43:310
10050440,0irq/346-48484000-21swapper/000:13:150
9950430,0irq/345-48484001067-21lighttpd23:25:390
9950430,0irq/345-48484000-21swapper/019:26:280
9950430,0irq/345-48484000-21swapper/019:18:410
81430,0rcu_preempt2266-21diskmemload21:22:091
81430,0rcu_preempt19-21ksoftirqd/122:08:571
81430,0rcu_preempt19-21ksoftirqd/121:54:321
10050430,0irq/346-484840054-21kswapd021:28:360
10050430,0irq/346-484840032262-21ssh23:50:200
10050430,0irq/346-484840023531-21cat23:08:510
10050430,0irq/346-484840017511-21munin-node0
81420,0rcu_preempt3-21ksoftirqd/022:28:520
81420,0rcu_preempt19-21ksoftirqd/123:59:031
81420,0rcu_preempt19-21ksoftirqd/122:18:591
10050420,0irq/346-484840011299-21apt-get22:23:430
10050420,0irq/346-48484000-21swapper/020:48:310
81410,0rcu_preempt54-21kswapd020:23:470
81410,0rcu_preempt23594-21kworker/1:000:27:281
81410,0rcu_preempt19-21ksoftirqd/120:09:001
10050410,0irq/346-484840032745-1kworker/0:1H21:03:450
81400,0rcu_preempt19-21ksoftirqd/123:14:011
81400,0rcu_preempt19-21ksoftirqd/121:33:561
81400,0rcu_preempt19-21ksoftirqd/120:19:021
2766899403,0cyclictest0-21swapper/019:33:530
10050400,0irq/346-48484008071-1kworker/0:1H19:48:480
10050400,0irq/346-484840029451-21munin-node0
10050400,0irq/346-484840012283-21if_eth219:58:520
10050400,0irq/346-48484000-21swapper/020:18:550
81390,0rcu_preempt7237-21ssh22:52:231
81390,0rcu_preempt30953-21ping19:36:181
81390,0rcu_preempt19-21ksoftirqd/122:34:001
81390,0rcu_preempt19-21ksoftirqd/122:34:001
81390,0rcu_preempt19-21ksoftirqd/120:06:331
81390,0rcu_preempt19-21ksoftirqd/100:15:341
246702390,0sleep024507-1kworker/0:3H20:37:130
9950380,0irq/345-484840013695-21fschecks_count20:03:490
81380,0rcu_preempt30953-21ping19:45:011
81380,0rcu_preempt30953-21ping19:45:011
81380,0rcu_preempt30953-21ping19:31:191
81380,0rcu_preempt19-21ksoftirqd/122:58:401
81380,0rcu_preempt19-21ksoftirqd/122:38:461
81380,0rcu_preempt19-21ksoftirqd/120:58:581
81380,0rcu_preempt19-21ksoftirqd/120:13:391
81380,0rcu_preempt19-21ksoftirqd/119:53:481
294622380,0chrt27814-1kworker/0:0H20:50:390
10050380,0irq/346-48484000-21swapper/019:08:490
81370,0rcu_preempt19-21ksoftirqd/123:47:351
81370,0rcu_preempt19-21ksoftirqd/123:33:451
81370,0rcu_preempt19-21ksoftirqd/121:03:381
81370,0rcu_preempt19-21ksoftirqd/100:31:501
81370,0rcu_preempt19-21ksoftirqd/100:20:111
193242371,0sleep12266-21diskmemload00:10:071
118432370,0chrt9856-1kworker/1:1H21:18:151
10050370,0irq/346-484840019720-1kworker/1:0H21:39:541
81360,0rcu_preempt30953-21ping19:23:511
81360,0rcu_preempt19-21ksoftirqd/119:13:441
2766899362,0cyclictest0-21swapper/019:38:420
1699360,0migration/131842-21runrttasks23:49:471
9950350,0irq/345-484840021226-1kworker/0:2H20:30:290
81350,0rcu_preempt30953-21ping19:38:521
81350,0rcu_preempt19-21ksoftirqd/121:28:191
81350,0rcu_preempt19-21ksoftirqd/120:52:551
81340,0rcu_preempt19-21ksoftirqd/120:38:561
81340,0rcu_preempt19-21ksoftirqd/119:19:061
81340,0rcu_preempt19-21ksoftirqd/119:08:521
9950330,0irq/345-48484000-21swapper/020:58:580
81330,0rcu_preempt19-21ksoftirqd/119:59:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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