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2026-04-15 - 12:49

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 Wed Apr 15, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811360,0rcu_preempt3-21ksoftirqd/000:23:590
811240,0rcu_preempt3-21ksoftirqd/019:44:010
811160,0rcu_preempt3-21ksoftirqd/023:38:460
811160,0rcu_preempt3-21ksoftirqd/023:38:460
811140,0rcu_preempt3-21ksoftirqd/023:48:570
811110,0rcu_preempt3-21ksoftirqd/000:28:570
811090,0rcu_preempt3-21ksoftirqd/021:58:550
811090,0rcu_preempt3-21ksoftirqd/021:58:550
811090,0rcu_preempt3-21ksoftirqd/021:53:580
811080,0rcu_preempt3-21ksoftirqd/022:59:060
811070,0rcu_preempt3-21ksoftirqd/022:43:500
811070,0rcu_preempt3-21ksoftirqd/022:28:500
811070,0rcu_preempt3-21ksoftirqd/022:08:300
811060,0rcu_preempt3-21ksoftirqd/021:28:310
811060,0rcu_preempt3-21ksoftirqd/000:18:500
811040,0rcu_preempt3-21ksoftirqd/021:18:530
811030,0rcu_preempt3-21ksoftirqd/022:33:430
811030,0rcu_preempt3-21ksoftirqd/022:33:430
811030,0rcu_preempt3-21ksoftirqd/022:25:520
811010,0rcu_preempt3-21ksoftirqd/019:34:060
81990,0rcu_preempt3-21ksoftirqd/019:19:030
81990,0rcu_preempt3-21ksoftirqd/019:19:030
81960,0rcu_preempt3-21ksoftirqd/023:23:300
81960,0rcu_preempt3-21ksoftirqd/021:29:010
81960,0rcu_preempt3-21ksoftirqd/000:08:310
81950,0rcu_preempt3-21ksoftirqd/023:28:300
81950,0rcu_preempt3-21ksoftirqd/022:53:570
81940,0rcu_preempt3-21ksoftirqd/019:28:310
81880,0rcu_preempt3-21ksoftirqd/023:43:590
81840,0rcu_preempt3-21ksoftirqd/022:18:550
81840,0rcu_preempt3-21ksoftirqd/020:23:500
81840,0rcu_preempt3-21ksoftirqd/000:33:570
81830,0rcu_preempt3-21ksoftirqd/023:55:300
81820,0rcu_preempt3-21ksoftirqd/020:07:270
81810,0rcu_preempt3-21ksoftirqd/022:38:580
81810,0rcu_preempt3-21ksoftirqd/022:13:550
81810,0rcu_preempt3-21ksoftirqd/021:16:020
81800,0rcu_preempt3-21ksoftirqd/023:08:580
81800,0rcu_preempt3-21ksoftirqd/019:29:040
81790,0rcu_preempt3-21ksoftirqd/022:48:450
81790,0rcu_preempt3-21ksoftirqd/000:13:560
81790,0rcu_preempt3-21ksoftirqd/000:13:560
81780,0rcu_preempt3-21ksoftirqd/000:00:120
81770,0rcu_preempt3-21ksoftirqd/021:03:430
81770,0rcu_preempt3-21ksoftirqd/021:03:430
81770,0rcu_preempt3-21ksoftirqd/000:08:580
81760,0rcu_preempt9538-21apt-get23:33:400
81750,0rcu_preempt851-21rngd22:08:540
81750,0rcu_preempt3-21ksoftirqd/021:33:470
81750,0rcu_preempt3-21ksoftirqd/020:58:540
81740,0rcu_preempt3-21ksoftirqd/021:08:440
81740,0rcu_preempt29531-21diskmemload23:03:490
81730,0rcu_preempt3-21ksoftirqd/021:48:530
81730,0rcu_preempt3-21ksoftirqd/020:53:520
81730,0rcu_preempt3-21ksoftirqd/020:03:290
81730,0rcu_preempt3-21ksoftirqd/019:13:440
81730,0rcu_preempt3-21ksoftirqd/019:13:440
81720,0rcu_preempt22391-21munin-node0
81710,0rcu_preempt4302-21taskset19:48:550
81710,0rcu_preempt3-21ksoftirqd/023:28:590
81690,0rcu_preempt3-21ksoftirqd/021:43:550
81670,0rcu_preempt3-21ksoftirqd/020:13:530
81670,0rcu_preempt3-21ksoftirqd/020:08:590
81670,0rcu_preempt22198-1kworker/0:0H19:08:530
81660,0rcu_preempt6510-21cron19:58:300
81660,0rcu_preempt29531-21diskmemload00:33:311
81660,0rcu_preempt19-21ksoftirqd/123:58:521
81640,0rcu_preempt3-21ksoftirqd/021:38:480
81630,0rcu_preempt3-21ksoftirqd/020:38:360
81630,0rcu_preempt22600-21latency_hist19:08:310
10050630,0irq/346-484840054-21kswapd021:52:071
10050610,0irq/346-484840015542-1kworker/1:3H22:12:421
81600,0rcu_preempt19-21ksoftirqd/100:25:541
10050600,0irq/346-48484009084-1kworker/1:1H00:07:451
10050600,0irq/346-48484007223-1kworker/1:1H23:32:221
10050600,0irq/346-484840030950-1kworker/1:0H22:19:211
10050600,0irq/346-484840029800-1kworker/1:2H23:21:341
81590,0rcu_preempt3-21ksoftirqd/020:29:450
81590,0rcu_preempt3-21ksoftirqd/020:29:450
10050590,0irq/346-484840054-21kswapd022:33:361
10050590,0irq/346-484840054-21kswapd022:33:361
10050590,0irq/346-484840029232-1kworker/1:1H21:09:531
10050590,0irq/346-484840029087-1kworker/1:0H21:44:261
10050590,0irq/346-484840012144-1kworker/1:0H23:45:081
10050590,0irq/346-484840011367-1kworker/1:2H22:01:441
10050590,0irq/346-484840011367-1kworker/1:2H22:01:441
81580,0rcu_preempt851-21rngd20:33:510
10050580,0irq/346-48484004586-1kworker/1:1H21:16:021
10050570,0irq/346-484840026839-1kworker/1:2H23:54:191
10050570,0irq/346-484840024150-1kworker/1:3H21:38:421
81560,0rcu_preempt19-21ksoftirqd/123:23:491
10050560,0irq/346-484840023138-1kworker/1:2H22:45:001
10050560,0irq/346-484840011367-1kworker/1:2H21:55:521
81550,0rcu_preempt3-21ksoftirqd/020:18:440
10050540,0irq/346-48484009084-1kworker/1:1H00:09:091
10050540,0irq/346-484840054-21kswapd021:35:181
10050540,0irq/346-48484005384-1kworker/1:0H22:59:531
10050540,0irq/346-48484004586-1kworker/1:1H21:23:391
81530,0rcu_preempt3-21ksoftirqd/020:43:520
10050530,0irq/346-484840054-21kswapd022:57:121
10050530,0irq/346-48484003451-1kworker/1:1H22:30:181
10050530,0irq/346-48484003451-1kworker/1:1H22:24:191
10050530,0irq/346-484840010247-1kworker/1:1H23:04:511
81520,0rcu_preempt3-21ksoftirqd/019:38:330
10050520,0irq/346-484840025627-21ssh23:49:121
10050520,0irq/346-484840019587-1kworker/1:1H00:23:101
10050520,0irq/346-484840013976-1kworker/1:0H00:32:081
10050510,0irq/346-484840031166-21ssh22:15:511
10050510,0irq/346-48484002314-1kworker/1:3H23:35:181
10050510,0irq/346-484840021329-21ssh23:12:281
10050500,0irq/346-484840017045-1kworker/1:2H23:43:021
10050500,0irq/346-484840017045-1kworker/1:2H23:43:021
10050490,0irq/346-48484004586-1kworker/1:1H21:19:181
81480,0rcu_preempt0-21swapper/122:52:371
10050480,0irq/346-484840054-21kswapd023:13:381
10050480,0irq/346-484840018765-21ssh00:15:481
10050480,0irq/346-484840018765-21ssh00:15:481
81470,0rcu_preempt19-21ksoftirqd/120:18:581
81470,0rcu_preempt19-21ksoftirqd/120:03:301
10050470,0irq/346-484840016373-21cron20:28:301
81460,0rcu_preempt19-21ksoftirqd/120:08:321
81450,0rcu_preempt23110-21apt-get20:48:420
10050450,0irq/346-484840023388-21ssh22:08:311
10050430,0irq/346-484840025820-21ping19:23:481
10050430,0irq/346-484840022369-21ssh22:39:381
10050430,0irq/346-48484000-21swapper/120:53:481
22544994224,0cyclictest28045-21apt-get21:03:431
22544994224,0cyclictest28045-21apt-get21:03:431
10050420,0irq/346-48484004586-1kworker/1:1H21:30:021
10050420,0irq/346-484840025820-21ping19:29:511
22544994118,0cyclictest6232-21runrttasks19:55:291
22544994025,0cyclictest19666-21munin-run20:38:301
22544994023,0cyclictest0-21swapper/120:38:431
22544993823,0cyclictest24331-21runrttasks19:13:431
22544993823,0cyclictest24331-21runrttasks19:13:431
22544993823,0cyclictest17509-21unixbench_multi20:28:581
22544993823,0cyclictest17509-21unixbench_multi20:28:581
81370,0rcu_preempt19-21ksoftirqd/120:51:021
81370,0rcu_preempt19-21ksoftirqd/119:08:211
22544993722,0cyclictest23117-21if_eth119:08:491
22544993720,0cyclictest26500-21munin-node1
22544993716,0cyclictest10143-21dropbear20:08:441
22544993622,0cyclictest1539-21runrttasks19:42:491
22544993622,0cyclictest12628-21grep20:14:011
22544993621,0cyclictest21862-21munin-node1
10050360,0irq/346-4848400851-21rngd19:48:521
81350,0rcu_preempt19-21ksoftirqd/119:33:531
22544993521,0cyclictest1759-21munin-node1
22544993418,0cyclictest25990-21apt19:18:411
22544993418,0cyclictest25990-21apt19:18:411
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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