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2026-03-13 - 15:50

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 100 highest latencies:
System rack9slot8s.osadl.org (updated Fri Mar 13, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
820501870,0irq/47-4a10000012086-21snmpd07:05:100
82050940,0irq/47-4a10000024670-21kworker/u2:112:40:040
82050890,0irq/47-4a10000013365-21ssh09:25:260
81950880,0irq/46-4a10000015877-21runrttasks10:39:320
82050860,0irq/47-4a10000025375-21rm12:08:300
81950860,0irq/46-4a10000021309-21ssh09:42:140
82050850,0irq/47-4a100000873-21ssh10:07:370
82050850,0irq/47-4a10000017307-21runrttasks11:51:140
82050850,0irq/47-4a10000012086-21snmpd11:11:140
81950850,0irq/46-4a10000018279-21ssh09:35:490
81950850,0irq/46-4a10000011157-21runrttasks11:38:160
82050840,0irq/47-4a1000004929-21idleruntime-cro11:25:000
82050840,0irq/47-4a1000004160-21sshd08:58:200
82050840,0irq/47-4a10000031193-21ssh10:03:060
82050840,0irq/47-4a10000029752-21munin-run08:15:010
82050830,0irq/47-4a100000604-21runrttasks08:35:190
82050830,0irq/47-4a10000027633-21dpkg09:55:150
312622837,0sleep031259-21/usr/sbin/munin08:25:020
82050820,0irq/47-4a1000005893-21diskmemload10:19:160
82050820,0irq/47-4a1000005890-21kworker/u2:111:40:080
82050820,0irq/47-4a10000031995-21awk08:30:010
82050820,0irq/47-4a10000027529-21munin-run08:00:020
82050820,0irq/47-4a10000012086-21snmpd09:20:440
81950820,0irq/46-4a1000005635-21seq11:26:230
81950820,0irq/46-4a10000029773-21ssh11:08:530
230022820,0chrt9237-21kworker/u2:009:45:430
89592810,0sleep04711-21kworker/u2:309:16:180
82050810,0irq/47-4a1000008287-21/usr/sbin/munin09:15:020
82050810,0irq/47-4a1000002877-21ssh10:11:500
82050810,0irq/47-4a10000016652-21cron11:50:000
82050810,0irq/47-4a10000012086-21snmpd11:56:280
81950810,0irq/46-4a10000022527-21ssh12:02:220
81950810,0irq/46-4a10000012086-21snmpd12:16:330
248222817,0sleep024829-21rm10:58:220
82050800,0irq/47-4a10000030505-21/usr/sbin/munin08:20:030
82050800,0irq/47-4a1000002709-21ssh12:29:200
82050800,0irq/47-4a10000023882-21kworker/u2:311:32:160
82050800,0irq/47-4a10000020875-21ssh10:50:000
82050800,0irq/47-4a1000002043-21ssh11:18:530
82050790,0irq/47-4a10000030701-21kworker/u2:710:40:100
82050790,0irq/47-4a10000029702-21kworker/u2:410:20:250
82050790,0irq/47-4a10000026050-21munin-run07:50:010
82050790,0irq/47-4a10000023361-21kworker/u2:007:45:020
82050790,0irq/47-4a1000002255-21sshd08:46:210
82050790,0irq/47-4a10000019549-21kworker/u2:010:54:130
53712790,0chrt2237-21kworker/u2:009:05:570
82050780,0irq/47-4a10000027058-21kworker/u2:312:14:570
82050780,0irq/47-4a10000022734-21sshd07:27:210
81950780,0irq/46-4a10000030945-21chrt12:20:100
81950780,0irq/46-4a10000011477-21latency_hist10:30:040
257112780,0chrt20183-21kworker/u2:409:51:290
207702786,0sleep020846-21if_eth007:15:130
82050770,0irq/47-4a10000031575-21kworker/u2:208:30:120
82050770,0irq/47-4a10000028262-21cron08:05:000
82050770,0irq/47-4a1000001481-1kworker/u3:408:45:030
81950770,0irq/46-4a1000003456-21apt-get08:55:020
81950770,0irq/46-4a10000012113-21runrttasks12:31:260
50392770,0sleep04711-21kworker/u2:309:04:170
82050760,0irq/47-4a10000026313-21sshd07:51:210
82050760,0irq/47-4a10000024560-21munin-run07:40:020
82050760,0irq/47-4a10000016102-1kworker/u3:109:35:000
81950760,0irq/46-4a10000011509-21cat10:30:040
82050740,0irq/47-4a10000032635-21kworker/u2:811:00:520
82050730,0irq/47-4a10000019829-21sshd07:10:210
101670,0ktimersoftd/021878-21sshd07:21:210
101650,0ktimersoftd/012086-21snmpd08:09:220
82050620,0irq/47-4a10000011699-21cron07:33:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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