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2026-03-29 - 14:53

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 Mar 29, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
87242740,0chrt9950irq/345-484840009:30:110
10050740,0irq/346-484840054-21kswapd012:02:590
81730,0rcu_preempt3-21ksoftirqd/009:47:070
81730,0rcu_preempt19-21ksoftirqd/110:43:471
81730,0rcu_preempt19-21ksoftirqd/110:43:471
81700,0rcu_preempt5528-21kworker/0:108:39:110
81680,0rcu_preempt19-21ksoftirqd/109:43:461
81650,0rcu_preempt19-21ksoftirqd/111:34:131
12033996526,0cyclictest25376-21ssh11:24:490
12033996523,0cyclictest28884-1kworker/0:3H09:51:590
12033996427,0cyclictest18983-21apt-get10:13:570
12033996418,0cyclictest0-21swapper/010:55:160
12033996417,0cyclictest15321-21ping07:18:460
12033996323,0cyclictest18720-1kworker/0:1H10:47:500
12033996318,0cyclictest0-21swapper/011:43:380
81620,0rcu_preempt3-21ksoftirqd/009:08:470
12033996226,0cyclictest5090-21ssh11:37:430
12033996224,0cyclictest28884-1kworker/0:3H09:59:060
81610,0rcu_preempt19-21ksoftirqd/108:38:591
12033996127,0cyclictest30826-21ssh11:30:250
81600,0rcu_preempt3-21ksoftirqd/008:18:480
10050600,0irq/346-484840013618-1kworker/1:0H11:55:231
81590,0rcu_preempt19-21ksoftirqd/108:59:021
12033995926,0cyclictest3216-21ssh09:57:560
12033995925,0cyclictest28498-21munin-node0
12033995924,0cyclictest1484-21apt-get10:28:560
12033995924,0cyclictest1484-21apt-get10:28:560
12033995918,0cyclictest0-21swapper/010:26:250
12033995914,0cyclictest0-21swapper/009:37:290
9950580,0irq/345-484840015321-21ping07:40:431
81580,0rcu_preempt3-21ksoftirqd/007:59:160
81580,0rcu_preempt19-21ksoftirqd/111:04:051
81580,0rcu_preempt19-21ksoftirqd/108:43:571
12033995825,0cyclictest13748-21munin-node0
12033995821,0cyclictest0-21swapper/012:13:170
12033995821,0cyclictest0-21swapper/012:13:170
10050580,0irq/346-484840016321-1kworker/1:2H10:19:081
81570,0rcu_preempt3-21ksoftirqd/012:28:590
81570,0rcu_preempt19-21ksoftirqd/110:13:461
81570,0rcu_preempt18568-1kworker/0:2H11:54:070
12033995730,0cyclictest0-21swapper/010:36:100
12033995727,0cyclictest15539-21ssh12:20:170
12033995725,0cyclictest9491-21munin-node0
12033995725,0cyclictest19034-21diskmemload10:09:110
12033995719,0cyclictest0-21swapper/009:19:200
81560,0rcu_preempt3-21ksoftirqd/009:26:560
12033995628,0cyclictest28527-1kworker/0:1H12:04:220
12033995626,0cyclictest19222-21ssh12:24:100
12033995626,0cyclictest19098-21idleruntime11:19:040
12033995623,0cyclictest0-21swapper/009:14:460
81550,0rcu_preempt3-21ksoftirqd/012:14:030
81550,0rcu_preempt19034-21diskmemload11:09:071
12033995538,0cyclictest30242-21apt-get08:03:590
12033995526,0cyclictest20754-21ssh11:53:450
12033995524,0cyclictest14749-21rm10:41:580
12033995524,0cyclictest14749-21rm10:41:580
12033995523,0cyclictest16114-21sh08:59:000
12033995522,0cyclictest9062-21apt-get10:03:580
12033995522,0cyclictest0-21swapper/010:22:250
10050550,0irq/346-48484008980-1kworker/1:0H09:33:051
10050550,0irq/346-484840054-21kswapd009:54:021
81540,0rcu_preempt3-21ksoftirqd/008:28:590
81540,0rcu_preempt19-21ksoftirqd/110:03:571
12033995437,0cyclictest15751-21munin-run08:58:460
12033995431,0cyclictest17535-21ntpq09:39:110
12033995425,0cyclictest21489-21runrttasks07:34:490
12033995423,0cyclictest0-21swapper/010:52:190
12033995423,0cyclictest0-21swapper/008:13:570
12033995326,0cyclictest11485-21php-cgi11:44:060
12033995322,0cyclictest32593-21runrttasks08:09:130
12033995320,0cyclictest0-21swapper/011:05:180
10050530,0irq/346-48484008652-1kworker/1:2H11:49:231
10050530,0irq/346-484840021180-1kworker/1:1H11:21:381
81520,0rcu_preempt3-21ksoftirqd/010:58:470
81520,0rcu_preempt3-21ksoftirqd/008:44:080
81520,0rcu_preempt3-21ksoftirqd/007:54:100
81520,0rcu_preempt19-21ksoftirqd/110:23:561
81520,0rcu_preempt19-21ksoftirqd/107:14:031
81520,0rcu_preempt10528-21apt-get07:03:580
12033995226,0cyclictest15321-21ping07:28:470
12033995222,0cyclictest0-21swapper/008:23:570
12033995221,0cyclictest0-21swapper/007:29:240
10050520,0irq/346-484840013618-1kworker/1:0H11:58:521
81510,0rcu_preempt6002-21wc08:28:471
81510,0rcu_preempt3-21ksoftirqd/009:04:050
81510,0rcu_preempt25305-21apt-get07:48:550
12033995124,0cyclictest14102-21idleruntime-cro08:53:460
12033995124,0cyclictest14102-21idleruntime-cro08:53:460
12033995121,0cyclictest8134-21if_eth308:34:080
81500,0rcu_preempt19034-21diskmemload11:14:001
12033995027,0cyclictest15321-21ping07:18:570
12033995026,0cyclictest15321-21ping07:38:570
9950490,0irq/345-484840013618-1kworker/1:0H11:46:581
81490,0rcu_preempt19-21ksoftirqd/110:44:061
12033994926,0cyclictest15321-21ping07:44:140
12033994920,0cyclictest0-21swapper/007:09:020
10050490,0irq/346-484840029617-21idleruntime09:19:041
10050480,0irq/346-484840054-21kswapd012:28:591
9950470,0irq/345-48484002257-1kworker/1:0H08:18:461
81470,0rcu_preempt26655-21php-cgi10:54:051
81470,0rcu_preempt19-21ksoftirqd/112:10:301
81470,0rcu_preempt19-21ksoftirqd/112:10:301
10050470,0irq/346-484840031984-21ls12:04:131
9950460,0irq/345-484840018717-1kworker/1:0H09:13:591
81460,0rcu_preempt19034-21diskmemload09:49:251
81460,0rcu_preempt11947-21kworker/1:109:24:091
10050460,0irq/346-484840031155-1kworker/1:2H11:31:011
10050460,0irq/346-484840021047-1kworker/1:0H12:28:461
81450,0rcu_preempt19-21ksoftirqd/107:19:121
10050450,0irq/346-484840023653-21cron10:18:461
10050450,0irq/346-484840015321-21ping07:29:201
81440,0rcu_preempt3758-21grep08:19:151
81440,0rcu_preempt19-21ksoftirqd/112:19:141
81440,0rcu_preempt19-21ksoftirqd/108:04:031
81440,0rcu_preempt19-21ksoftirqd/107:44:161
81440,0rcu_preempt19-21ksoftirqd/107:34:061
81440,0rcu_preempt0-21swapper/111:39:111
10050440,0irq/346-48484000-21swapper/111:26:481
81430,0rcu_preempt27153-21diskstats07:54:011
81430,0rcu_preempt19-21ksoftirqd/112:37:071
81430,0rcu_preempt19-21ksoftirqd/110:51:101
81430,0rcu_preempt19-21ksoftirqd/109:10:491
81430,0rcu_preempt19-21ksoftirqd/108:23:591
81430,0rcu_preempt19-21ksoftirqd/107:23:561
81430,0rcu_preempt19-21ksoftirqd/107:04:091
81430,0rcu_preempt12807-21grep07:09:081
10050430,0irq/346-48484003832-1kworker/1:0H10:37:011
81420,0rcu_preempt28295-21ping08:09:141
81420,0rcu_preempt19-21ksoftirqd/109:43:571
81420,0rcu_preempt19-21ksoftirqd/108:49:121
81420,0rcu_preempt19-21ksoftirqd/108:49:121
81420,0rcu_preempt1127-21kworker/1:110:29:061
81420,0rcu_preempt1127-21kworker/1:110:29:061
81410,0rcu_preempt19-21ksoftirqd/112:14:121
81410,0rcu_preempt19-21ksoftirqd/109:36:061
81410,0rcu_preempt19-21ksoftirqd/108:34:051
81410,0rcu_preempt19034-21diskmemload10:02:111
81400,0rcu_preempt19-21ksoftirqd/107:58:581
10050400,0irq/346-484840031128-21latency_hist10:58:471
81390,0rcu_preempt19-21ksoftirqd/107:48:561
81380,0rcu_preempt19-21ksoftirqd/109:03:571
81380,0rcu_preempt19-21ksoftirqd/108:53:571
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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