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2025-10-15 - 16:29

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 Oct 15, 2025 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
818502040,0irq/46-4a10000030776-21kworker/0:007:08:010
81950840,0irq/47-4a10000025359-21ssh09:26:390
81950820,0irq/47-4a10000015173-21snmpd11:19:230
81850820,0irq/46-4a1000008490-21ssh12:17:390
81850820,0irq/46-4a1000005777-21ssh12:11:470
81850820,0irq/46-4a10000022898-21apt-key10:30:020
81850820,0irq/46-4a10000022499-21ssh11:38:220
81950810,0irq/47-4a10000026074-21kworker/u2:210:39:350
81850810,0irq/46-4a1000009733-21modprobe08:19:530
81850810,0irq/46-4a1000009-21ksoftirqd/010:09:560
81950800,0irq/47-4a10000018839-21kworker/u2:110:30:040
81850800,0irq/46-4a10000030227-21ssh09:36:580
81850800,0irq/46-4a10000016674-21ssh12:35:040
81850800,0irq/46-4a10000015286-21ssh12:32:060
81950790,0irq/47-4a10000012714-21runrttasks08:39:560
81850790,0irq/46-4a1000004006-21ssh12:08:030
81850790,0irq/46-4a10000032742-21runrttasks10:50:490
81850790,0irq/46-4a10000031619-21ssh10:48:400
81850790,0irq/46-4a10000028097-21ssh11:50:080
81850790,0irq/46-4a10000023430-21ssh11:40:100
81850790,0irq/46-4a1000001543-21runrttasks12:02:460
81950780,0irq/47-4a10000012977-21ssh12:27:110
81850780,0irq/46-4a1000009018-21ssh11:09:430
81850780,0irq/46-4a1000007705-21ssh09:57:590
81850780,0irq/46-4a1000004425-21ssh09:50:570
81850780,0irq/46-4a10000031318-21ssh11:57:080
81850780,0irq/46-4a10000029312-21ssh10:43:430
81850780,0irq/46-4a10000019114-21runrttasks09:13:370
81850780,0irq/46-4a10000016758-21runrttasks09:05:200
81850780,0irq/46-4a10000016037-21ssh11:24:380
46672780,0chrt3344-21kworker/u2:107:44:590
81950770,0irq/47-4a1000007700-21sshd08:05:330
81950770,0irq/47-4a1000004483-21lockfile-create10:59:590
81850770,0irq/46-4a10000014724-21sh10:12:470
45022770,0chrt4122-21kworker/u2:507:44:370
323202770,0chrt25863-21kworker/u2:407:14:580
27282770,0chrt25071-21kworker/u2:809:47:250
81950760,0irq/47-4a10000010473-21apt08:24:530
81850760,0irq/46-4a10000024324-21runrttasks09:24:370
211592760,0sleep020659-21kworker/u2:009:17:530
178072760,0sleep017169-21kworker/u2:011:28:200
81950750,0irq/47-4a1000008967-21latency_hist08:14:540
81950750,0irq/47-4a10000019691-21ssh11:32:180
81950750,0irq/47-4a10000014828-21rs:main0
81850750,0irq/46-4a10000031699-21sort09:39:590
81850750,0irq/46-4a10000029902-21kworker/u2:210:02:100
81850750,0irq/46-4a10000017625-21ssh10:18:560
81850750,0irq/46-4a10000010445-21ssh12:21:440
63372750,0sleep02598-21kworker/u2:007:56:380
63352750,0chrt5161-21kworker/u2:111:03:550
136592750,0sleep013062-21kworker/u2:508:45:510
115962750,0chrt11539-21kworker/u2:108:32:110
81950740,0irq/47-4a1000007447-21sshd08:04:340
81950740,0irq/47-4a1000005591-21sshd07:51:340
81950740,0irq/47-4a1000003241-21sshd07:35:320
81950740,0irq/47-4a10000013013-21sshd08:41:350
81850740,0irq/46-4a10000027484-21kworker/u2:109:34:570
81850740,0irq/46-4a10000019459-21seq10:22:420
81950730,0irq/47-4a10000026000-21ssh11:45:410
81950730,0irq/47-4a1000001845-1kworker/u3:007:29:500
81850730,0irq/46-4a10000017343-21diskmemload11:13:380
81950720,0irq/47-4a10000011539-21kworker/u2:108:59:550
144102710,0chrt8510-21kworker/u2:308:51:020
158262700,0chrt15192-21kworker/u2:009:00:170
14182700,0sleep01097-21kworker/u2:707:23:390
101620,0ktimersoftd/031629-21chrt07:11:060
31378994630,0cyclictest31376-21cyclictest07:29:570
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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