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2026-01-04 - 14:50

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 Sun Jan 04, 2026 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114662990,0sleep010050irq/346-484840008:26:180
34622930,0sleep010050irq/346-484840008:03:300
81870,0rcu_preempt13032-1kworker/1:2H11:30:101
81780,0rcu_preempt3-21ksoftirqd/012:20:000
81750,0rcu_preempt24925-21diskmemload12:36:110
81740,0rcu_preempt17944-21cyclictest10:03:471
81730,0rcu_preempt21810-21apt-get09:00:000
81690,0rcu_preempt3-21ksoftirqd/011:47:510
10050690,0irq/346-484840028152-1kworker/0:3H12:01:260
81680,0rcu_preempt54-21kswapd011:59:481
81680,0rcu_preempt3-21ksoftirqd/011:14:440
81660,0rcu_preempt3-21ksoftirqd/011:25:190
81660,0rcu_preempt3-21ksoftirqd/010:19:410
81650,0rcu_preempt3-21ksoftirqd/011:40:000
81650,0rcu_preempt3-21ksoftirqd/010:42:020
17945996519,0cyclictest0-21swapper/012:30:200
10050650,0irq/346-48484001941-1kworker/0:1H11:50:080
81640,0rcu_preempt3-21ksoftirqd/011:21:420
81610,0rcu_preempt3-21ksoftirqd/010:14:290
81610,0rcu_preempt3-21ksoftirqd/009:18:030
81610,0rcu_preempt3-21ksoftirqd/007:39:550
81610,0rcu_preempt15424-21df09:35:040
50172610,0sleep010050irq/346-484840008:07:370
17945996121,0cyclictest4217-1kworker/0:2H11:14:500
17945996121,0cyclictest0-21swapper/010:50:080
17945996120,0cyclictest473-1kworker/0:1H09:42:490
81600,0rcu_preempt24925-21diskmemload09:20:420
81600,0rcu_preempt11551-21kworker/0:208:40:100
18512600,0sleep010050irq/346-484840007:59:010
17945996023,0cyclictest23523-21runrttasks07:25:140
17945996019,0cyclictest24774-1kworker/0:2H10:23:210
81590,0rcu_preempt3908-21kworker/0:111:29:590
81590,0rcu_preempt3-21ksoftirqd/010:30:010
81590,0rcu_preempt3-21ksoftirqd/008:20:020
17945995918,0cyclictest24925-21diskmemload12:04:550
10050590,0irq/346-484840054-21kswapd012:20:531
81580,0rcu_preempt9765-21kworker/0:110:09:260
81580,0rcu_preempt3-21ksoftirqd/010:27:010
81580,0rcu_preempt24925-21diskmemload10:58:330
17945995825,0cyclictest12360-21apt-get10:44:590
9950570,0irq/345-48484005129-21chrt08:08:501
81570,0rcu_preempt3-21ksoftirqd/012:24:590
17945995724,0cyclictest11656-21munin-node0
17945995719,0cyclictest1308-21lldpd11:57:040
10050570,0irq/346-484840018937-1kworker/1:0H11:00:201
81560,0rcu_preempt3-21ksoftirqd/009:47:140
58242560,0chrt9950irq/345-484840012:27:471
17945995625,0cyclictest647-21php-cgi09:55:020
17945995623,0cyclictest9973-21ssh09:29:070
17945995623,0cyclictest17561-21munin-node0
17945995622,0cyclictest20183-21if_eth207:15:100
17945995621,0cyclictest27776-1kworker/0:4H11:03:280
10050560,0irq/346-484840025567-1kworker/0:0H11:39:070
81550,0rcu_preempt3-21ksoftirqd/008:54:590
17945995524,0cyclictest4147-21rm10:35:120
17945995523,0cyclictest32052-21ssh09:53:540
17945995521,0cyclictest8611-1kworker/0:1H10:04:410
81540,0rcu_preempt3-21ksoftirqd/008:35:080
81540,0rcu_preempt19-21ksoftirqd/111:11:531
4350540,0irq/32-4330000023635-21dropbear09:05:041
17945995423,0cyclictest26951-21dropbear12:15:090
17945995419,0cyclictest0-21swapper/007:23:310
10050540,0irq/346-484840028279-21unixbench_singl10:25:201
10050540,0irq/346-484840013033-1kworker/1:4H11:25:211
81530,0rcu_preempt3-21ksoftirqd/008:15:180
81530,0rcu_preempt25198-21apt-get09:10:000
17945995323,0cyclictest6551-1kworker/0:1H08:11:310
17945995319,0cyclictest25164-1kworker/0:2H12:14:340
17945995319,0cyclictest25164-1kworker/0:2H12:14:340
81520,0rcu_preempt3-21ksoftirqd/008:50:020
81520,0rcu_preempt3-21ksoftirqd/008:30:100
17945995224,0cyclictest24921-21awk07:30:080
17945995221,0cyclictest30479-21ssh11:05:100
17945995219,0cyclictest27006-21munin-node0
17945995219,0cyclictest0-21swapper/007:45:070
10050520,0irq/346-484840054-21kswapd012:38:121
10050520,0irq/346-484840023750-1kworker/1:1H11:36:071
10050520,0irq/346-484840021638-1kworker/1:4H09:44:341
10050520,0irq/346-48484001444-21latency_hist09:19:501
17945995126,0cyclictest0-21swapper/009:05:190
17945995123,0cyclictest17920-1kworker/0:1H07:10:190
10050510,0irq/346-48484006614-21ssh11:51:191
10050510,0irq/346-484840025112-21ssh10:22:111
10050510,0irq/346-484840016911-21aten_rapower_cu08:45:011
17945995023,0cyclictest29106-1kworker/0:3H07:50:180
10050500,0irq/346-484840054-21kswapd011:47:591
10050500,0irq/346-484840054-21kswapd010:57:051
10050500,0irq/346-48484001519-21latency_hist09:19:491
10050500,0irq/346-484840010090-1kworker/1:4H10:51:091
9950490,0irq/345-484840021222-21ping07:40:261
81490,0rcu_preempt6940-21kworker/1:012:12:541
81490,0rcu_preempt6940-21kworker/1:012:12:541
81490,0rcu_preempt3-21ksoftirqd/007:05:110
81490,0rcu_preempt3-21ksoftirqd/007:05:110
81490,0rcu_preempt19-21ksoftirqd/108:10:221
4350490,0irq/32-433000000-21swapper/109:50:031
10050490,0irq/346-48484005662-1kworker/1:1H10:37:351
10050490,0irq/346-484840024021-21munin-node1
10050480,0irq/346-484840029979-1kworker/1:4H11:44:131
10050480,0irq/346-484840027773-1kworker/1:2H11:05:141
10050480,0irq/346-484840027163-1kworker/1:0H10:46:171
10050480,0irq/346-484840027163-1kworker/1:0H10:33:271
10050480,0irq/346-484840026092-1kworker/1:2H09:55:471
10050480,0irq/346-484840013486-21ssh11:59:561
81470,0rcu_preempt19-21ksoftirqd/108:27:581
81460,0rcu_preempt19-21ksoftirqd/107:35:151
10050460,0irq/346-48484009066-21ssh11:17:291
10050460,0irq/346-48484008257-1kworker/1:0H09:30:331
10050460,0irq/346-48484007022-1kworker/1:3H10:05:001
9950450,0irq/345-484840027163-1kworker/1:0H10:40:211
81450,0rcu_preempt24925-21diskmemload12:15:261
10050450,0irq/346-484840054-21kswapd008:20:231
10050450,0irq/346-484840017944-21cyclictest09:36:171
10050450,0irq/346-484840014822-21ssh11:24:351
10050450,0irq/346-48484000-21swapper/108:39:501
81440,0rcu_preempt19-21ksoftirqd/107:25:341
10050440,0irq/346-48484009118-21ssh12:31:071
10050440,0irq/346-48484001297-21snmpd10:19:151
10050440,0irq/346-48484000-21swapper/109:10:131
9950430,0irq/345-48484000-21swapper/107:21:311
81430,0rcu_preempt21222-21ping07:45:051
81430,0rcu_preempt19-21ksoftirqd/108:00:021
81420,0rcu_preempt19-21ksoftirqd/112:05:001
81420,0rcu_preempt19-21ksoftirqd/107:30:021
81410,0rcu_preempt19-21ksoftirqd/110:14:101
81410,0rcu_preempt19-21ksoftirqd/107:15:001
81400,0rcu_preempt19-21ksoftirqd/108:15:101
81400,0rcu_preempt19-21ksoftirqd/107:05:161
81400,0rcu_preempt19-21ksoftirqd/107:05:161
81390,0rcu_preempt19-21ksoftirqd/109:28:031
81390,0rcu_preempt19-21ksoftirqd/108:59:501
81390,0rcu_preempt19-21ksoftirqd/108:38:121
81380,0rcu_preempt19-21ksoftirqd/107:59:481
81370,0rcu_preempt19-21ksoftirqd/107:10:191
81360,0rcu_preempt19-21ksoftirqd/108:55:151
81360,0rcu_preempt19-21ksoftirqd/108:50:021
81360,0rcu_preempt19-21ksoftirqd/108:34:481
81360,0rcu_preempt19-21ksoftirqd/107:50:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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