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2026-01-03 - 14:05

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 Jan 03, 2026 00:43:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811230,0rcu_preempt1202-21ntpd21:43:081
811230,0rcu_preempt1202-21ntpd21:43:081
811150,0rcu_preempt19-21ksoftirqd/121:10:141
811150,0rcu_preempt19-21ksoftirqd/121:10:141
811150,0rcu_preempt19-21ksoftirqd/120:25:081
811150,0rcu_preempt11691-21diskmemload22:58:221
811100,0rcu_preempt11691-21diskmemload22:38:431
811090,0rcu_preempt11691-21diskmemload00:32:401
811010,0rcu_preempt7736-1kworker/1:1H00:08:501
275762980,0sleep010050irq/346-484840020:18:470
260202950,0sleep010050irq/346-484840020:14:430
81900,0rcu_preempt8007-1kworker/1:1H23:33:181
81900,0rcu_preempt19-21ksoftirqd/123:50:131
81900,0rcu_preempt19-21ksoftirqd/122:09:141
81890,0rcu_preempt19-21ksoftirqd/121:53:361
81890,0rcu_preempt11130-1kworker/1:0H23:05:031
81870,0rcu_preempt19-21ksoftirqd/122:18:031
81870,0rcu_preempt19-21ksoftirqd/122:18:031
81870,0rcu_preempt19-21ksoftirqd/121:15:231
81860,0rcu_preempt19-21ksoftirqd/122:19:581
81820,0rcu_preempt19-21ksoftirqd/100:39:141
225422810,0sleep010050irq/346-484840020:02:260
81790,0rcu_preempt19-21ksoftirqd/100:29:491
81780,0rcu_preempt5358-21apt-get22:15:010
81780,0rcu_preempt5358-21apt-get22:15:010
81780,0rcu_preempt3-21ksoftirqd/000:29:100
81770,0rcu_preempt3-21ksoftirqd/023:33:360
81760,0rcu_preempt19-21ksoftirqd/122:50:171
81740,0rcu_preempt54-21kswapd020:05:160
81740,0rcu_preempt3-21ksoftirqd/023:48:130
81740,0rcu_preempt19-21ksoftirqd/121:39:401
81730,0rcu_preempt3-21ksoftirqd/022:32:090
81730,0rcu_preempt19-21ksoftirqd/120:05:561
81730,0rcu_preempt11691-21diskmemload21:26:071
81730,0rcu_preempt11691-21diskmemload21:26:071
81720,0rcu_preempt3-21ksoftirqd/023:55:160
81720,0rcu_preempt19-21ksoftirqd/121:45:191
81720,0rcu_preempt19-21ksoftirqd/120:40:031
81720,0rcu_preempt19-21ksoftirqd/120:40:031
81710,0rcu_preempt3-21ksoftirqd/023:17:180
81710,0rcu_preempt3-21ksoftirqd/023:07:330
81710,0rcu_preempt3-21ksoftirqd/022:48:050
81710,0rcu_preempt3-21ksoftirqd/022:44:480
81710,0rcu_preempt3-21ksoftirqd/021:44:080
81710,0rcu_preempt3-21ksoftirqd/021:44:080
210252710,0sleep010050irq/346-484840019:58:590
81700,0rcu_preempt3-21ksoftirqd/023:36:480
81700,0rcu_preempt3-21ksoftirqd/023:36:480
81700,0rcu_preempt3-21ksoftirqd/021:20:210
81700,0rcu_preempt3-21ksoftirqd/021:11:280
81700,0rcu_preempt3-21ksoftirqd/021:11:280
81700,0rcu_preempt3-21ksoftirqd/000:00:270
81700,0rcu_preempt19-21ksoftirqd/122:40:581
81700,0rcu_preempt19-21ksoftirqd/119:39:521
81700,0rcu_preempt11691-21diskmemload23:25:491
81700,0rcu_preempt11691-21diskmemload22:03:331
81700,0rcu_preempt11691-21diskmemload00:21:271
81690,0rcu_preempt3-21ksoftirqd/023:44:460
81690,0rcu_preempt3-21ksoftirqd/022:25:060
81690,0rcu_preempt3-21ksoftirqd/022:04:380
81690,0rcu_preempt3-21ksoftirqd/021:51:300
81690,0rcu_preempt3-21ksoftirqd/000:07:350
81690,0rcu_preempt19-21ksoftirqd/123:49:501
81690,0rcu_preempt11691-21diskmemload22:59:511
81680,0rcu_preempt3-21ksoftirqd/023:12:090
81680,0rcu_preempt3-21ksoftirqd/022:10:450
81680,0rcu_preempt3-21ksoftirqd/021:33:500
81680,0rcu_preempt3-21ksoftirqd/000:38:560
81680,0rcu_preempt3-21ksoftirqd/000:33:110
81680,0rcu_preempt19-21ksoftirqd/123:10:051
81670,0rcu_preempt3-21ksoftirqd/021:56:260
81670,0rcu_preempt3-21ksoftirqd/021:16:190
81670,0rcu_preempt19-21ksoftirqd/122:45:131
81670,0rcu_preempt19-21ksoftirqd/121:23:541
81670,0rcu_preempt19-21ksoftirqd/120:12:241
81660,0rcu_preempt19-21ksoftirqd/120:35:081
81660,0rcu_preempt11691-21diskmemload23:20:251
293192650,0sleep010050irq/346-484840020:24:450
81640,0rcu_preempt4699-21cyclictest20:35:190
81640,0rcu_preempt3-21ksoftirqd/022:05:390
81640,0rcu_preempt3-21ksoftirqd/000:22:500
81640,0rcu_preempt19-21ksoftirqd/119:35:231
81630,0rcu_preempt3-21ksoftirqd/019:20:170
81630,0rcu_preempt3-21ksoftirqd/000:17:190
81630,0rcu_preempt11691-21diskmemload22:10:261
81630,0rcu_preempt11691-21diskmemload21:32:561
81620,0rcu_preempt19-21ksoftirqd/119:51:281
81620,0rcu_preempt12430-1kworker/1:0H23:37:551
81620,0rcu_preempt12430-1kworker/1:0H23:37:551
81600,0rcu_preempt3-21ksoftirqd/022:59:030
81600,0rcu_preempt3-21ksoftirqd/019:10:020
81600,0rcu_preempt12084-1kworker/1:3H22:25:171
81590,0rcu_preempt3-21ksoftirqd/022:20:430
81590,0rcu_preempt19-21ksoftirqd/119:55:031
81580,0rcu_preempt3-21ksoftirqd/020:25:040
10050580,0irq/346-48484003-21ksoftirqd/021:25:200
10050580,0irq/346-48484003-21ksoftirqd/021:25:200
81570,0rcu_preempt3-21ksoftirqd/023:23:230
81570,0rcu_preempt26379-21dropbear20:15:071
81570,0rcu_preempt19-21ksoftirqd/119:30:171
81570,0rcu_preempt19-21ksoftirqd/119:30:171
81560,0rcu_preempt54-21kswapd023:50:010
10050560,0irq/346-484840013430-1kworker/0:2H19:40:020
81550,0rcu_preempt6007-21grep20:50:170
81550,0rcu_preempt3-21ksoftirqd/021:39:430
81550,0rcu_preempt19-21ksoftirqd/119:20:191
81540,0rcu_preempt29422-1kworker/1:1H23:19:431
81540,0rcu_preempt23345-21apt-get22:35:010
81540,0rcu_preempt19-21ksoftirqd/123:59:511
81540,0rcu_preempt17986-1kworker/1:2H23:59:501
81530,0rcu_preempt3-21ksoftirqd/019:05:150
81530,0rcu_preempt22734-21kworker/0:121:48:130
81530,0rcu_preempt19-21ksoftirqd/100:16:381
81520,0rcu_preempt19-21ksoftirqd/121:55:181
9950510,0irq/345-48484007974-21ping19:19:500
81510,0rcu_preempt3-21ksoftirqd/000:11:500
317722510,0sleep09950irq/345-484840020:30:160
81500,0rcu_preempt54-21kswapd019:50:140
81500,0rcu_preempt3-21ksoftirqd/019:45:140
81500,0rcu_preempt19-21ksoftirqd/123:40:571
81500,0rcu_preempt11691-21diskmemload23:25:020
81490,0rcu_preempt7131-21diskstats20:55:070
81490,0rcu_preempt3-21ksoftirqd/023:02:390
81490,0rcu_preempt3-21ksoftirqd/022:52:160
81490,0rcu_preempt3-21ksoftirqd/019:25:050
470099496,0cyclictest6951-1kworker/0:2H20:59:510
10050490,0irq/346-48484003-21ksoftirqd/019:30:180
10050490,0irq/346-48484003-21ksoftirqd/019:30:180
81470,0rcu_preempt3-21ksoftirqd/020:39:590
81470,0rcu_preempt3-21ksoftirqd/020:39:590
81470,0rcu_preempt19-21ksoftirqd/119:25:141
470199472,0cyclictest31125-21apt-get20:30:031
4700994614,0cyclictest811-21rngd21:05:040
470199452,0cyclictest10458-21ssh00:10:021
278372450,0sleep19950irq/345-484840020:19:531
220842450,0chrt9950irq/345-484840022:33:201
13250450,0irq/301-48020003-21ksoftirqd/019:35:060
470199442,0cyclictest964-21dropbear19:45:081
4701994313,0cyclictest6973-21munin-node1
81420,0rcu_preempt29293-21kworker/1:021:00:081
81420,0rcu_preempt19-21ksoftirqd/119:11:001
4701994211,0cyclictest17540-1kworker/1:0H19:59:571
470099429,0cyclictest4783-21runrttasks20:46:100
470199418,0cyclictest9762-1kworker/1:3H21:08:261
470199412,0cyclictest8399-21sendmail20:59:491
470199412,0cyclictest5645-21seq20:50:101
470199401,0cyclictest3645-21apt-get20:45:011
81390,0rcu_preempt19-21ksoftirqd/119:09:431
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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