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2026-06-27 - 20:00

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 Sat Jun 27, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811070,0rcu_preempt18575-1kworker/0:1H07:27:400
81760,0rcu_preempt3-21ksoftirqd/011:02:500
81760,0rcu_preempt3-21ksoftirqd/010:22:340
81760,0rcu_preempt3-21ksoftirqd/010:22:340
81760,0rcu_preempt3-21ksoftirqd/009:37:390
81740,0rcu_preempt3-21ksoftirqd/009:22:320
81740,0rcu_preempt3-21ksoftirqd/009:12:450
81740,0rcu_preempt3-21ksoftirqd/007:12:190
81670,0rcu_preempt3-21ksoftirqd/012:06:490
81660,0rcu_preempt3-21ksoftirqd/009:11:450
81610,0rcu_preempt3-21ksoftirqd/011:22:330
81610,0rcu_preempt19-21ksoftirqd/110:21:561
81590,0rcu_preempt6761-21php-cgi10:32:400
81590,0rcu_preempt19-21ksoftirqd/109:37:461
81580,0rcu_preempt19-21ksoftirqd/111:07:321
81580,0rcu_preempt19-21ksoftirqd/108:52:361
81580,0rcu_preempt19-21ksoftirqd/108:47:401
10050570,0irq/346-484840013150-1kworker/0:1H10:51:170
10050570,0irq/346-484840013150-1kworker/0:1H10:51:170
81560,0rcu_preempt3-21ksoftirqd/007:37:330
81560,0rcu_preempt19-21ksoftirqd/108:42:391
9950550,0irq/345-4848400181ktimersoftd/109:33:541
81550,0rcu_preempt19-21ksoftirqd/111:22:471
81550,0rcu_preempt19-21ksoftirqd/107:12:351
81550,0rcu_preempt0-21swapper/109:45:141
81540,0rcu_preempt21789-21apt-get09:42:300
81530,0rcu_preempt3-21ksoftirqd/011:49:040
81530,0rcu_preempt3-21ksoftirqd/009:57:360
81530,0rcu_preempt19-21ksoftirqd/112:02:481
81530,0rcu_preempt19-21ksoftirqd/111:15:431
81530,0rcu_preempt19-21ksoftirqd/109:10:351
10050530,0irq/346-484840021275-1kworker/0:3H11:29:130
10050530,0irq/346-484840018210-21ssh11:17:100
9950520,0irq/345-48484001067-21lighttpd08:37:211
81520,0rcu_preempt3-21ksoftirqd/010:32:190
81520,0rcu_preempt19-21ksoftirqd/111:42:361
81520,0rcu_preempt19-21ksoftirqd/111:42:361
10050520,0irq/346-484840028060-1kworker/0:2H10:57:560
10050520,0irq/346-484840019-21ksoftirqd/110:40:011
10050520,0irq/346-484840019-21ksoftirqd/110:40:011
9950510,0irq/345-4848400311632sleep009:52:020
81510,0rcu_preempt19-21ksoftirqd/110:27:351
81510,0rcu_preempt19-21ksoftirqd/110:02:401
10050510,0irq/346-484840029996-1kworker/0:0H12:36:290
10050510,0irq/346-484840013150-1kworker/0:1H10:52:490
10050510,0irq/346-484840010130-21switchtime10:02:460
81500,0rcu_preempt3-21ksoftirqd/011:42:310
81500,0rcu_preempt3-21ksoftirqd/011:42:310
81500,0rcu_preempt3-21ksoftirqd/011:07:480
81500,0rcu_preempt19-21ksoftirqd/112:07:391
81500,0rcu_preempt19-21ksoftirqd/111:52:431
81500,0rcu_preempt19-21ksoftirqd/111:06:391
81500,0rcu_preempt19-21ksoftirqd/108:12:411
81490,0rcu_preempt3-21ksoftirqd/010:41:370
81490,0rcu_preempt3-21ksoftirqd/010:41:370
81490,0rcu_preempt3-21ksoftirqd/009:29:560
81490,0rcu_preempt19-21ksoftirqd/112:34:311
81490,0rcu_preempt19-21ksoftirqd/112:24:261
81490,0rcu_preempt19-21ksoftirqd/110:47:331
81490,0rcu_preempt19-21ksoftirqd/110:47:331
9950480,0irq/345-484840081rcu_preempt10:43:141
9950480,0irq/345-484840015604-21ping07:17:190
81480,0rcu_preempt19-21ksoftirqd/112:12:491
81480,0rcu_preempt19-21ksoftirqd/109:22:471
81480,0rcu_preempt17834-21apt-get09:02:300
81470,0rcu_preempt32428-21php-cgi08:07:380
81470,0rcu_preempt3-21ksoftirqd/012:12:390
81470,0rcu_preempt3-21ksoftirqd/010:17:290
81470,0rcu_preempt19-21ksoftirqd/110:52:321
10050470,0irq/346-484840026823-21sshd07:49:420
10050470,0irq/346-484840013150-1kworker/0:1H10:42:360
81460,0rcu_preempt3-21ksoftirqd/011:41:000
81460,0rcu_preempt19-21ksoftirqd/108:02:201
81460,0rcu_preempt19-21ksoftirqd/108:02:201
81460,0rcu_preempt19-21ksoftirqd/107:57:371
10050460,0irq/346-48484007963-21ssh12:12:180
10050460,0irq/346-484840032147-21ssh09:19:410
10050460,0irq/346-484840016033-21ssh10:08:450
81450,0rcu_preempt3-21ksoftirqd/011:59:020
81450,0rcu_preempt19-21ksoftirqd/108:32:371
10050450,0irq/346-484840054-21kswapd012:23:460
10050450,0irq/346-484840027404-21ssh07:52:330
10050450,0irq/346-484840025113-1kworker/0:2H12:30:130
10050450,0irq/346-484840021519-21ssh10:14:260
10050450,0irq/346-484840012868-21switchtime09:32:470
9950440,0irq/345-484840022118-21ssh11:52:500
81440,0rcu_preempt3-21ksoftirqd/009:52:330
81440,0rcu_preempt19-21ksoftirqd/108:22:331
10050440,0irq/346-48484003-21ksoftirqd/007:17:530
10050440,0irq/346-48484002548-21rm11:33:100
10050440,0irq/346-4848400181ktimersoftd/110:23:081
10050440,0irq/346-4848400181ktimersoftd/110:23:081
9950430,0irq/345-48484003-21ksoftirqd/012:18:250
81430,0rcu_preempt3-21ksoftirqd/007:02:420
81430,0rcu_preempt29530-21ssh09:17:321
81430,0rcu_preempt19-21ksoftirqd/109:55:201
10050430,0irq/346-4848400181ktimersoftd/111:49:141
10050430,0irq/346-484840015604-21ping07:22:390
9950420,0irq/345-48484002881-21ls08:17:180
9950420,0irq/345-484840022358-21ssh11:21:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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