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2026-04-01 - 13:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #8

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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack9slot8s.osadl.org (updated Wed Apr 01, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501450,0irq/46-4a1000000-21swapper19:06:030
81950910,0irq/46-4a10000016654-21munin-run21:45:030
82050890,0irq/47-4a10000028621-21idleruntime-cro20:45:000
81950890,0irq/46-4a10000021188-21ssh21:54:380
82050870,0irq/47-4a10000030646-21ssh22:14:530
82050870,0irq/47-4a10000017622-21munin-run00:05:010
82050870,0irq/47-4a10000012640-21ssh21:36:300
81950870,0irq/46-4a1000001655-21ssh21:13:330
127272870,0chrt29832-21kworker/u2:623:54:390
82050860,0irq/47-4a1000005841-21ssh22:30:580
82050860,0irq/47-4a10000016895-21readlink21:45:120
82050860,0irq/47-4a10000015369-21sshd19:15:210
81950860,0irq/46-4a1000004940-21ssh21:20:150
82050850,0irq/47-4a10000025152-21rm23:12:010
82050850,0irq/47-4a10000018942-21latency_hist19:40:040
81950850,0irq/46-4a1000009279-21seq21:29:340
82050840,0irq/47-4a100000880-21kworker/u2:421:34:220
82050840,0irq/47-4a1000007744-21ssh22:35:070
82050840,0irq/47-4a1000006557-21kworker/u2:800:20:040
82050840,0irq/47-4a1000004284-21ssh22:27:410
82050840,0irq/47-4a10000017729-21sort00:05:040
82050840,0irq/47-4a10000012383-21ssh22:44:570
82050840,0irq/47-4a10000012086-21snmpd22:03:540
81950840,0irq/46-4a1000008572-21ssh23:45:390
82050830,0irq/47-4a10000032324-21latency_hist21:10:060
82050830,0irq/47-4a10000030094-21awk20:55:010
82050830,0irq/47-4a10000023502-21rm21:59:360
82050830,0irq/47-4a10000023247-21runrttasks20:08:530
82050830,0irq/47-4a10000022669-21munin-run20:05:010
82050830,0irq/47-4a10000022077-21sshd23:05:220
82050830,0irq/47-4a10000019447-21cron23:00:010
82050830,0irq/47-4a10000014561-21runrttasks23:58:300
293152830,0chrt3800-21kworker/u2:223:20:460
82050820,0irq/47-4a10000031768-21diskmemload23:25:590
82050820,0irq/47-4a10000026389-21munin-run20:30:010
82050820,0irq/47-4a10000021916-21munin-run20:00:040
82050820,0irq/47-4a10000016187-21kworker/u2:400:14:040
82050820,0irq/47-4a10000014810-21munin-run19:15:020
81950820,0irq/46-4a1000003493-21munin-run23:35:020
276892820,0sleep03800-21kworker/u2:223:17:230
82050810,0irq/47-4a1000004131-21kworker/u2:023:37:270
82050810,0irq/47-4a10000032428-21ssh00:36:270
82050810,0irq/47-4a10000027726-21kworker/u2:100:31:190
82050810,0irq/47-4a10000027046-21ssh00:25:030
82050810,0irq/47-4a10000026924-21ssh22:06:450
82050810,0irq/47-4a10000021733-21diskmemload23:04:500
82050810,0irq/47-4a10000017131-21munin-run22:55:030
81950810,0irq/46-4a1000004468-21ssh21:19:290
276172810,0chrt6557-21kworker/u2:800:26:100
192652810,0sleep017006-21kworker/u2:119:41:360
82050800,0irq/47-4a1000006557-21kworker/u2:823:43:490
82050800,0irq/47-4a1000002979-21cron22:25:000
81950800,0irq/46-4a10000020437-21munin-run19:50:020
82050790,0irq/47-4a10000013044-21ssh22:46:100
325352790,0chrt31418-21kworker/u2:022:18:500
311192790,0sleep030079-21kworker/u2:321:01:220
82050780,0irq/47-4a10000026651-21sshd20:31:210
82050780,0irq/47-4a10000025226-21kworker/u2:620:25:020
82050770,0irq/47-4a10000018206-21munin-run19:35:030
273422770,0chrt25226-21kworker/u2:620:35:590
173422770,0sleep017006-21kworker/u2:119:29:090
307912760,0sleep030079-21kworker/u2:320:59:520
289332760,0sleep028873-21kworker/u2:020:46:420
207982760,0sleep020783-21kworker/u2:119:52:060
81950750,0irq/46-4a10000016140-21sshd19:20:200
238292750,0sleep022928-21kworker/u2:120:12:340
13888995028,0cyclictest24137-21latency_hist20:15:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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