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2026-05-21 - 20:37

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Thu May 21, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811010,0rcu_preempt3-21ksoftirqd/012:30:570
81990,0rcu_preempt3-21ksoftirqd/011:06:030
81980,0rcu_preempt3-21ksoftirqd/010:46:360
81930,0rcu_preempt19-21ksoftirqd/110:13:181
81890,0rcu_preempt54-21kswapd010:55:121
81840,0rcu_preempt54-21kswapd011:49:491
81840,0rcu_preempt19-21ksoftirqd/109:09:121
81790,0rcu_preempt3-21ksoftirqd/010:31:210
81740,0rcu_preempt19-21ksoftirqd/111:04:591
81740,0rcu_preempt14732-21ssh10:51:131
81730,0rcu_preempt0-21swapper/111:20:321
81720,0rcu_preempt54-21kswapd009:30:411
81670,0rcu_preempt19-21ksoftirqd/110:29:241
81660,0rcu_preempt54-21kswapd012:18:521
81660,0rcu_preempt19-21ksoftirqd/111:45:301
81660,0rcu_preempt19-21ksoftirqd/111:25:141
81640,0rcu_preempt19-21ksoftirqd/112:32:461
81640,0rcu_preempt19-21ksoftirqd/109:43:131
81630,0rcu_preempt19-21ksoftirqd/110:23:071
2462996318,0cyclictest28010-1kworker/0:4H12:33:130
81620,0rcu_preempt19-21ksoftirqd/108:18:221
81610,0rcu_preempt3-21ksoftirqd/012:12:060
10050610,0irq/346-484840054-21kswapd011:12:170
81600,0rcu_preempt19-21ksoftirqd/111:37:471
2462995916,0cyclictest7464-1kworker/0:2H09:15:400
122252590,0chrt10050irq/346-484840007:37:190
81580,0rcu_preempt19-21ksoftirqd/111:38:061
2462995822,0cyclictest1867-21cat09:32:560
2462995820,0cyclictest20812-21apt-get12:03:050
2462995820,0cyclictest20812-21apt-get12:03:050
2462995815,0cyclictest54-21kswapd012:18:240
2462995812,0cyclictest0-21swapper/009:39:170
2462995812,0cyclictest0-21swapper/009:39:170
81570,0rcu_preempt3-21ksoftirqd/009:58:070
81570,0rcu_preempt18437-21kworker/0:010:23:050
2462995717,0cyclictest1057850kworker/0:0H12:26:430
81560,0rcu_preempt943-21apt-get11:43:070
81560,0rcu_preempt19-21ksoftirqd/112:02:141
2462995615,0cyclictest1235-1kworker/0:2H10:05:490
81550,0rcu_preempt19-21ksoftirqd/112:11:541
81550,0rcu_preempt19-21ksoftirqd/110:59:041
81550,0rcu_preempt19-21ksoftirqd/110:00:521
2462995519,0cyclictest15105-21seq09:45:580
81540,0rcu_preempt3-21ksoftirqd/011:23:120
81540,0rcu_preempt19-21ksoftirqd/111:15:061
81540,0rcu_preempt19-21ksoftirqd/108:15:451
2462995421,0cyclictest9197-1kworker/0:1H09:19:350
2462995420,0cyclictest9741-21munin-node0
2462995417,0cyclictest3511-1kworker/0:1H10:40:540
2462995416,0cyclictest18073-1kworker/0:2H12:02:140
2462995416,0cyclictest14385-21sh10:18:130
2462995415,0cyclictest24279-1kworker/0:2H09:23:280
2462995411,0cyclictest0-21swapper/011:28:230
2462995320,0cyclictest21269-21ssh10:58:060
2462995320,0cyclictest0-21swapper/011:18:410
2462995319,0cyclictest6578-21fschecks_time08:58:110
2462995319,0cyclictest6578-21fschecks_time08:58:110
2462995318,0cyclictest4558-21idleruntime10:08:120
2462995317,0cyclictest3144-1kworker/0:0H11:48:510
2462995317,0cyclictest28007-1kworker/0:2H12:13:300
2462995311,0cyclictest25638-1kworker/0:0H11:37:060
81520,0rcu_preempt3-21ksoftirqd/010:48:160
81520,0rcu_preempt18601-21ping08:18:050
2462995219,0cyclictest25638-1kworker/0:0H11:38:180
2462995211,0cyclictest13078-1kworker/0:1H11:54:580
81510,0rcu_preempt16105-1kworker/0:0H10:33:170
2462995118,0cyclictest23513-1kworker/0:3H08:13:150
2462995117,0cyclictest10538-21ssh10:13:350
81500,0rcu_preempt3-21ksoftirqd/007:53:170
81500,0rcu_preempt19-21ksoftirqd/107:44:531
2462995020,0cyclictest21749-21munin-node0
2462995019,0cyclictest9456-21diskmemload09:32:550
2462995019,0cyclictest1570-21php-cgi08:43:110
2462995017,0cyclictest27241-21php-cgi08:23:070
81490,0rcu_preempt3-21ksoftirqd/010:53:060
81490,0rcu_preempt3-21ksoftirqd/008:11:380
81490,0rcu_preempt19-21ksoftirqd/108:23:121
2462994918,0cyclictest21514-21latency_hist09:52:560
2462994914,0cyclictest14595-21irqstats07:43:200
2462994912,0cyclictest9674-21irqstats07:28:190
81480,0rcu_preempt4674-21apt-get08:53:051
81480,0rcu_preempt3-21ksoftirqd/008:03:440
81480,0rcu_preempt3-21ksoftirqd/007:59:090
81480,0rcu_preempt3-21ksoftirqd/007:48:150
81480,0rcu_preempt19-21ksoftirqd/111:11:101
81480,0rcu_preempt19-21ksoftirqd/109:50:011
2462994815,0cyclictest0-21swapper/008:42:560
81470,0rcu_preempt800-1kworker/0:0H11:14:300
81470,0rcu_preempt5744-21ping07:18:070
81470,0rcu_preempt3-21ksoftirqd/009:03:150
81470,0rcu_preempt3-21ksoftirqd/008:33:150
81470,0rcu_preempt28920-21runrttasks10:33:061
81470,0rcu_preempt19-21ksoftirqd/110:20:481
81470,0rcu_preempt19-21ksoftirqd/109:53:071
81470,0rcu_preempt19-21ksoftirqd/109:38:051
81470,0rcu_preempt19-21ksoftirqd/109:38:051
81470,0rcu_preempt19-21ksoftirqd/107:22:401
2462994717,0cyclictest5389-21taskset08:53:190
2462994714,0cyclictest1348-21lldpd07:38:330
81460,0rcu_preempt3-21ksoftirqd/007:11:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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