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2026-05-28 - 20:36

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 50 highest latencies:
System rack9slot8s.osadl.org (updated Thu May 28, 2026 12:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2086821130,0chrt20266-21kworker/u2:507:05:210
82050870,0irq/47-4a1000007682-21munin-run09:10:010
82050870,0irq/47-4a10000025648-21apt-config07:35:040
82050870,0irq/47-4a10000019722-21readlink10:30:070
82050870,0irq/47-4a10000012086-21snmpd11:15:010
82050850,0irq/47-4a10000029754-21sshd11:35:150
81950850,0irq/46-4a10000012086-21snmpd09:34:360
82050840,0irq/47-4a10000023383-21latency_hist07:20:050
82050840,0irq/47-4a1000001394-21kworker/u2:312:05:000
82050830,0irq/47-4a10000031684-21kworker/u2:711:55:020
82050830,0irq/47-4a10000031578-21sshd11:46:150
82050830,0irq/47-4a10000026786-21sshd11:15:160
82050830,0irq/47-4a10000025815-21rm07:35:090
82050830,0irq/47-4a10000024879-21munin-run07:30:020
81950830,0irq/46-4a1000007037-21munin-plugin-st12:40:010
82050820,0irq/47-4a1000008195-21runrttasks09:13:220
82050820,0irq/47-4a10000031120-21apt-get11:45:020
82050820,0irq/47-4a10000023381-21sh07:20:020
82050820,0irq/47-4a10000019565-21cron10:30:010
82050820,0irq/47-4a1000001656-21apt-config08:30:060
82050820,0irq/47-4a10000012086-21snmpd12:25:190
82050820,0irq/47-4a10000011715-21runrttasks09:36:430
81950820,0irq/46-4a10000012113-21runrttasks11:03:150
39142820,0sleep02781-21kworker/u2:008:44:450
82050810,0irq/47-4a1000004078-21munin-run12:20:030
82050810,0irq/47-4a10000030600-21kworker/u2:108:10:020
82050810,0irq/47-4a10000028763-21sh07:55:010
82050810,0irq/47-4a10000025717-21munin-run11:10:020
82050810,0irq/47-4a10000022995-21runrttasks10:51:090
82050810,0irq/47-4a10000022328-21latency_hist07:15:050
82050810,0irq/47-4a10000021251-21apt10:40:020
81950810,0irq/46-4a10000029507-21sh08:00:010
81950810,0irq/46-4a10000013662-21latency_hist09:50:020
81950810,0irq/46-4a10000012086-21snmpd10:44:540
140862810,0chrt13921-21kworker/u2:409:52:470
82050800,0irq/47-4a1000008549-21sshd09:15:160
82050800,0irq/47-4a1000005317-21runrttasks08:54:110
82050800,0irq/47-4a10000032477-21cron08:20:010
82050800,0irq/47-4a10000016587-21cron10:10:030
82050800,0irq/47-4a10000012551-21sshd09:42:150
82050800,0irq/47-4a10000010411-21runrttasks09:28:100
82050790,0irq/47-4a1000004439-21kworker/u2:512:35:000
82050790,0irq/47-4a10000029271-21sshd11:32:150
82050790,0irq/47-4a10000026057-21kworker/u2:207:45:030
81950790,0irq/46-4a10000015107-21sh10:00:010
81950790,0irq/46-4a10000012086-21snmpd09:24:330
226972790,0chrt20054-21kworker/u2:310:49:440
82050780,0irq/47-4a100000943-21sshd08:25:250
82050780,0irq/47-4a1000004696-21cron08:50:010
82050780,0irq/47-4a10000018354-21kworker/u2:510:25:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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