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2026-05-21 - 13:57

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 376 highest latencies:
System rack9slot8s.osadl.org (updated Thu May 21, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8205012940,0irq/47-4a1000009-21ksoftirqd/019:05:280
322489911628,0cyclictest25155-21munin-run21:55:020
322489911229,0cyclictest9959-21sshd23:48:090
322489911127,0cyclictest28139-21latency_hist22:15:020
32248991109,0cyclictest13190-21apt-get00:10:040
322489911028,0cyclictest12134-21munin-run20:30:030
322489911024,0cyclictest13828-21sendmail-msp20:40:010
322489910927,0cyclictest978-21munin-node19:15:170
322489910923,0cyclictest28431-21seq22:16:420
322489910824,0cyclictest17053-21sshd00:33:090
322489910812,0cyclictest3329-21latency_hist23:05:020
322489910729,0cyclictest4957-21kworker/u2:019:50:010
322489910729,0cyclictest4427-21sshd23:12:060
322489910729,0cyclictest4180-21kworker/u2:519:40:020
322489910728,0cyclictest23305-21kworker/u2:021:45:020
322489910727,0cyclictest12086-21snmpd22:23:510
322489910626,0cyclictest8464-21sshd23:38:100
322489910622,0cyclictest4315-21kworker/u2:123:30:010
322489910610,0cyclictest7756-21latency_hist20:00:040
322489910523,0cyclictest11688-21apt00:00:010
322489910425,0cyclictest12604-21kworker/u2:520:55:000
322489910423,0cyclictest32505-21sshd19:11:190
322489910421,0cyclictest7851-21sshd23:34:090
322489910418,0cyclictest5556-21munin-run23:20:010
322489910411,0cyclictest13190-21apt-get00:10:370
322489910328,0cyclictest12086-21snmpd19:58:180
322489910313,0cyclictest15825-21apt00:25:010
322489910312,0cyclictest891-21munin-run22:50:010
322489910312,0cyclictest21778-21kworker/u2:422:00:000
322489910312,0cyclictest1268-21sshd22:52:100
322489910234,0cyclictest16525-21runrttasks00:29:530
322489910223,0cyclictest19322-21sshd21:15:100
322489910222,0cyclictest12085-21sshd00:02:090
322489910218,0cyclictest19205-21munin-run21:15:010
322489910215,0cyclictest17526-21munin-run21:05:020
322489910211,0cyclictest31590-21sshd22:38:090
322489910211,0cyclictest2080-21sshd22:56:090
32248991019,0cyclictest6908-21idleruntime-cro19:55:000
322489910129,0cyclictest82050irq/47-4a10000021:30:000
322489910128,0cyclictest11625-21in:imuxsock00:20:000
322489910122,0cyclictest4066-21/usr/sbin/munin23:10:020
322489910121,0cyclictest11381-21munin-run20:25:020
322489910113,0cyclictest5434-21apt19:45:010
322489910113,0cyclictest10939-21apt23:55:010
322489910111,0cyclictest6262-21sshd23:23:100
322489910026,0cyclictest82050irq/47-4a10000019:35:010
322489910020,0cyclictest21937-21sshd21:33:100
322489910014,0cyclictest18237-21munin-run00:40:010
32248999925,0cyclictest30518-21kworker/u2:319:26:110
32248999922,0cyclictest82050irq/47-4a10000019:25:010
32248999911,0cyclictest21778-21kworker/u2:422:10:030
32248999911,0cyclictest17858-21runrttasks21:05:170
3224899988,0cyclictest10642-21sendmail20:20:000
32248999830,0cyclictest12096-21lldpd20:35:030
32248999824,0cyclictest82050irq/47-4a10000021:39:100
32248999822,0cyclictest82050irq/47-4a10000020:15:010
32248999822,0cyclictest14132-21kworker/u2:620:50:030
32248999821,0cyclictest82050irq/47-4a10000021:20:100
32248999810,0cyclictest29836-21sshd22:25:510
32248999722,0cyclictest11657-21sshd20:41:360
32248999717,0cyclictest9348-21sshd23:44:100
32248999711,0cyclictest26249-21sshd22:01:520
32248999710,0cyclictest8695-21sshd20:06:310
32248999619,0cyclictest28854-21kworker/u2:522:35:010
32248999617,0cyclictest24418-21munin-run21:50:030
32248999613,0cyclictest16772-21munin-run21:00:010
3224899949,0cyclictest31957-21ls22:40:040
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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