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2026-06-11 - 05:55

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 Jun 11, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
351501920,0irq/20-4900000010461-21kworker/0:319:08:170
82050860,0irq/47-4a1000004406-21apt22:00:010
82050850,0irq/47-4a10000020565-21kworker/u2:300:10:070
82050850,0irq/47-4a10000012086-21snmpd23:44:150
82050840,0irq/47-4a10000021381-21kworker/u2:020:30:000
82050840,0irq/47-4a10000011831-21ntp_states19:15:140
82050830,0irq/47-4a10000022865-21sshd00:00:500
82050830,0irq/47-4a10000021045-21idleruntime-cro20:15:000
82050830,0irq/47-4a10000020876-21seq23:49:230
82050820,0irq/47-4a10000026256-21munin-run20:50:010
82050820,0irq/47-4a10000025516-21idleruntime-cro20:45:000
82050820,0irq/47-4a10000024148-21runrttasks20:35:130
81950820,0irq/46-4a10000018010-21kworker/u2:023:30:000
82050810,0irq/47-4a10000031662-21idleruntime-cro21:25:010
82050810,0irq/47-4a10000025066-21kworker/u2:521:15:320
82050810,0irq/47-4a10000013428-21cron19:25:000
82050810,0irq/47-4a10000012086-21snmpd23:50:400
81950810,0irq/46-4a10000012086-21snmpd22:44:020
82050800,0irq/47-4a1000008486-21kworker/u2:022:40:010
82050800,0irq/47-4a10000027296-21cron00:30:000
82050800,0irq/47-4a10000022028-21sshd23:56:510
82050800,0irq/47-4a10000017679-21sshd19:51:540
82050800,0irq/47-4a10000015941-21sshd23:15:370
82050800,0irq/47-4a10000015026-21sh23:10:000
82050800,0irq/47-4a10000012086-21snmpd22:28:580
82050800,0irq/47-4a10000011292-21sshd22:45:370
82050790,0irq/47-4a10000026986-21latency_hist20:55:030
82050790,0irq/47-4a10000025348-21kworker/u2:200:20:030
82050790,0irq/47-4a10000018814-21latency_hist20:00:040
82050790,0irq/47-4a10000017535-21kworker/u2:223:30:020
82050790,0irq/47-4a100000171602chrt23:24:150
82050790,0irq/47-4a10000014922-21awk19:35:000
82050790,0irq/47-4a10000012223-21kworker/u2:519:40:010
80872790,0chrt7368-21kworker/u2:322:24:420
288092790,0sleep027711-21kworker/u2:321:06:480
212162796,0sleep021217-21sshd20:15:380
168232790,0chrt16663-21kworker/u2:419:47:280
82050780,0irq/47-4a1000007415-21sendmail-msp22:20:010
82050780,0irq/47-4a10000032707-21runrttasks21:31:400
82050780,0irq/47-4a10000025066-21kworker/u2:521:30:010
82050780,0irq/47-4a10000013326-21kworker/u2:123:00:010
82050780,0irq/47-4a10000012607-21/usr/sbin/munin22:55:010
82050780,0irq/47-4a10000012093-21lldpd21:14:190
82050780,0irq/47-4a10000012086-21snmpd23:39:140
82050780,0irq/47-4a10000011627-21rs:main0
274802780,0chrt22906-21kworker/u2:700:30:370
267252780,0chrt25066-21kworker/u2:520:52:580
235182780,0chrt21381-21kworker/u2:020:31:070
110672788,0sleep011068-21sshd19:11:370
82050770,0irq/47-4a1000006638-21munin-run22:15:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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