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2026-01-09 - 19:07

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 Fri Jan 09, 2026 12:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811040,0rcu_preempt19-21ksoftirqd/109:45:191
81990,0rcu_preempt19-21ksoftirqd/111:05:181
81940,0rcu_preempt19-21ksoftirqd/107:25:171
10050790,0irq/346-4848400111rcuc/012:14:270
81750,0rcu_preempt3-21ksoftirqd/011:08:240
81750,0rcu_preempt19-21ksoftirqd/110:20:051
10050750,0irq/346-4848400111rcuc/010:23:290
9950740,0irq/345-4848400111rcuc/012:06:090
9950740,0irq/345-4848400111rcuc/011:00:450
81740,0rcu_preempt3-21ksoftirqd/012:23:590
81740,0rcu_preempt3-21ksoftirqd/011:40:440
81740,0rcu_preempt3-21ksoftirqd/009:19:140
31424997413,0cyclictest27428-21runrttasks10:33:160
9950730,0irq/345-4848400111rcuc/011:59:100
9950730,0irq/345-4848400111rcuc/010:06:170
81730,0rcu_preempt3-21ksoftirqd/011:21:590
10050730,0irq/346-4848400111rcuc/010:50:100
9950720,0irq/345-4848400111rcuc/012:29:000
9950720,0irq/345-4848400111rcuc/010:01:090
81720,0rcu_preempt3-21ksoftirqd/010:29:160
81720,0rcu_preempt3-21ksoftirqd/009:35:370
10050720,0irq/346-4848400111rcuc/010:17:320
9950710,0irq/345-484840041ktimersoftd/009:43:550
81710,0rcu_preempt3-21ksoftirqd/009:54:210
3142499713,0cyclictest0-21swapper/008:14:160
9950700,0irq/345-4848400111rcuc/011:28:290
81700,0rcu_preempt3-21ksoftirqd/010:13:270
81690,0rcu_preempt3-21ksoftirqd/011:10:360
9950680,0irq/345-4848400111rcuc/012:17:010
9950680,0irq/345-4848400111rcuc/009:47:310
9950680,0irq/345-4848400111rcuc/009:11:180
81680,0rcu_preempt19-21ksoftirqd/107:15:011
3142499681,0cyclictest7096-21taskset11:16:090
3142499672,0cyclictest18948-21munin-node0
3142499672,0cyclictest0-21swapper/009:28:510
81660,0rcu_preempt19-21ksoftirqd/111:46:191
81660,0rcu_preempt18902-21munin-node1
3142499666,0cyclictest0-21swapper/010:49:270
81650,0rcu_preempt19-21ksoftirqd/107:50:241
81640,0rcu_preempt19-21ksoftirqd/111:33:521
81640,0rcu_preempt19-21ksoftirqd/111:20:001
81640,0rcu_preempt19-21ksoftirqd/110:34:341
3142499643,0cyclictest0-21swapper/011:48:330
31424996414,0cyclictest18779-21ssh09:21:310
81630,0rcu_preempt26462-1kworker/1:2H10:40:021
81630,0rcu_preempt19-21ksoftirqd/112:07:031
81630,0rcu_preempt19-21ksoftirqd/109:13:471
3142499632,0cyclictest0-21swapper/011:54:040
3142499631,0cyclictest17294-21rm10:55:130
3142499626,0cyclictest0-21swapper/011:37:370
3142499626,0cyclictest0-21swapper/010:41:140
3142499622,0cyclictest2458-21latency_hist07:20:030
3142499622,0cyclictest17520-21munin-node0
3142499622,0cyclictest15288-21taskset07:58:180
81610,0rcu_preempt19-21ksoftirqd/107:20:071
3142499612,0cyclictest26993-21apt-get09:30:110
3142499612,0cyclictest2497950ssh09:59:390
3142499612,0cyclictest21714-1kworker/0:1H08:20:070
3142499612,0cyclictest21714-1kworker/0:1H08:20:070
3142499611,0cyclictest29066-21apt-get10:35:110
3142499611,0cyclictest15241-21ping08:15:190
3142499604,0cyclictest15241-21ping08:00:050
3142499601,0cyclictest0-21swapper/011:34:510
81590,0rcu_preempt19-21ksoftirqd/111:20:041
81590,0rcu_preempt19-21ksoftirqd/111:14:211
3142499592,0cyclictest24269-21ssh12:36:260
3142499592,0cyclictest0-21swapper/012:31:080
81580,0rcu_preempt19-21ksoftirqd/112:25:171
81580,0rcu_preempt19-21ksoftirqd/108:36:571
3142499589,0cyclictest11128-21if_eth107:45:240
3142499582,0cyclictest2311-21ping07:20:010
81570,0rcu_preempt23304-1kworker/1:1H11:40:041
81570,0rcu_preempt19-21ksoftirqd/112:20:011
81570,0rcu_preempt19-21ksoftirqd/108:05:261
81570,0rcu_preempt0-21swapper/112:33:141
3142499572,0cyclictest5569-21ls09:05:290
3142499572,0cyclictest0-21swapper/008:45:220
81560,0rcu_preempt15241-21ping08:04:431
3142499561,0cyclictest2311-21ping07:30:100
3142499561,0cyclictest2311-21ping07:25:110
81550,0rcu_preempt19-21ksoftirqd/110:57:241
81550,0rcu_preempt0-21swapper/108:17:141
3142499552,0cyclictest29970-1kworker/0:1H09:00:010
3142499552,0cyclictest0-21swapper/008:30:210
3142499551,0cyclictest3438-21chrt09:00:180
3142499551,0cyclictest0-21swapper/008:38:500
81540,0rcu_preempt31569-21apt-get07:10:110
81540,0rcu_preempt19-21ksoftirqd/111:36:121
81540,0rcu_preempt19-21ksoftirqd/111:29:531
3142499544,0cyclictest3-21ksoftirqd/007:37:550
3142499542,0cyclictest2311-21ping07:40:110
81530,0rcu_preempt32081-21munin-node0
81530,0rcu_preempt19-21ksoftirqd/110:15:421
81530,0rcu_preempt19-21ksoftirqd/109:55:101
81530,0rcu_preempt19-21ksoftirqd/108:53:521
81530,0rcu_preempt0-21swapper/111:03:431
81520,0rcu_preempt19-21ksoftirqd/112:35:301
81510,0rcu_preempt28857-21kworker/1:209:50:261
81510,0rcu_preempt0-21swapper/109:15:091
3142499511,0cyclictest1470-21runrttasks08:25:300
81500,0rcu_preempt19-21ksoftirqd/109:39:401
81500,0rcu_preempt19-21ksoftirqd/109:30:101
81480,0rcu_preempt3-21ksoftirqd/008:40:170
81480,0rcu_preempt21301-21ssh12:01:511
81480,0rcu_preempt19-21ksoftirqd/112:10:111
3142499482,0cyclictest0-21swapper/007:54:080
10050480,0irq/346-484840031356-21runrttasks07:09:360
10050480,0irq/346-484840031356-21runrttasks07:09:360
81470,0rcu_preempt19-21ksoftirqd/108:20:221
81470,0rcu_preempt19-21ksoftirqd/108:20:221
81470,0rcu_preempt1350-21lldpd11:55:031
81460,0rcu_preempt19-21ksoftirqd/109:00:161
81450,0rcu_preempt19-21ksoftirqd/110:10:161
81450,0rcu_preempt19-21ksoftirqd/110:05:301
81450,0rcu_preempt19-21ksoftirqd/109:20:221
81450,0rcu_preempt19-21ksoftirqd/107:05:181
81450,0rcu_preempt19-21ksoftirqd/107:05:181
81450,0rcu_preempt1470-21runrttasks08:55:111
81440,0rcu_preempt27995-1kworker/1:1H10:04:181
81440,0rcu_preempt19-21ksoftirqd/108:30:211
81430,0rcu_preempt19-21ksoftirqd/112:16:181
81430,0rcu_preempt19-21ksoftirqd/110:50:121
81430,0rcu_preempt19-21ksoftirqd/110:45:131
81430,0rcu_preempt19-21ksoftirqd/107:45:311
81430,0rcu_preempt19-21ksoftirqd/107:40:011
81420,0rcu_preempt19-21ksoftirqd/107:55:121
81420,0rcu_preempt19-21ksoftirqd/107:40:301
81420,0rcu_preempt0-21swapper/109:06:561
81410,0rcu_preempt19-21ksoftirqd/110:35:201
81410,0rcu_preempt19-21ksoftirqd/110:25:381
81410,0rcu_preempt19-21ksoftirqd/109:25:151
9950400,0irq/345-48484003142599cyclictest11:50:101
81400,0rcu_preempt5269-21ssh09:40:171
81390,0rcu_preempt19-21ksoftirqd/108:43:591
81390,0rcu_preempt19-21ksoftirqd/108:26:011
81390,0rcu_preempt0-21swapper/108:45:101
81380,0rcu_preempt19-21ksoftirqd/107:14:201
9950310,0irq/345-48484003142599cyclictest07:30:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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