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2025-08-26 - 21:30

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 all highest latencies:
System rack9slot8s.osadl.org (updated Tue Aug 26, 2025 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
818501680,0irq/46-4a10000022321-21seq07:05:180
81950860,0irq/47-4a10000023599-21apt10:49:560
81950850,0irq/47-4a10000020044-21ssh09:32:590
81850840,0irq/46-4a10000017935-21ssh10:37:500
81850820,0irq/46-4a10000022987-21ssh09:39:230
81850810,0irq/46-4a1000009059-21diskmemload09:52:290
77402818,0sleep07746-21ssh12:33:360
309952815,0sleep031004-21ssh11:05:210
124362816,0sleep012442-21ssh10:26:070
81950800,0irq/47-4a1000004533-21kworker/u2:112:26:450
81950800,0irq/47-4a1000002934-21apt-get08:29:520
81950800,0irq/47-4a10000024309-21munin-run12:00:020
81950800,0irq/47-4a10000015173-21snmpd10:41:570
81850800,0irq/46-4a1000009075-21kworker/u2:209:24:580
81850800,0irq/46-4a1000008012-21ssh11:25:210
81850800,0irq/46-4a1000004863-21ssh11:18:510
81850800,0irq/46-4a10000030572-21ssh12:13:120
128642808,0sleep012870-21ssh09:17:500
81950790,0irq/47-4a1000009468-21kworker/u2:410:24:410
81850790,0irq/46-4a1000007924-21kworker/u2:709:10:050
81850790,0irq/46-4a10000024007-21ssh10:50:180
81850790,0irq/46-4a10000019491-21ssh11:49:500
81950780,0irq/47-4a10000031529-21seq08:03:480
81950780,0irq/47-4a10000025780-21latency_hist07:24:510
81850780,0irq/46-4a10000030541-21ssh11:04:340
81850780,0irq/46-4a10000021933-1kworker/u3:210:59:590
81850780,0irq/46-4a10000015173-21snmpd10:16:460
81850780,0irq/46-4a10000010961-21runrttasks11:31:390
81950770,0irq/47-4a10000028877-1kworker/u3:009:59:550
81950770,0irq/47-4a1000001469-21ssh11:11:330
81850770,0irq/46-4a100000472-21chrt10:00:280
81850770,0irq/46-4a10000027517-21ssh12:06:390
81850770,0irq/46-4a10000016504-21chrt10:34:530
81950760,0irq/47-4a1000009166-21sshd12:36:300
81950760,0irq/47-4a1000005682-21ssh10:11:410
81950760,0irq/47-4a1000005357-21idleruntime-cro08:44:530
81950760,0irq/47-4a10000029705-21kworker/u2:008:19:530
81950760,0irq/47-4a10000016433-21apt-config09:25:040
81850760,0irq/46-4a1000003072-21ssh12:23:400
81850760,0irq/46-4a10000013557-21ssh11:37:110
154912760,0chrt12460-21kworker/u2:311:41:090
81950750,0irq/47-4a1000004632-21sendmail-msp08:39:540
81950750,0irq/47-4a10000028153-21sshd07:40:210
81950750,0irq/47-4a10000027298-21kworker/u2:412:16:120
81950750,0irq/47-4a10000023740-21latency_hist07:14:540
81950750,0irq/47-4a10000019898-21sshd11:50:290
81850750,0irq/46-4a10000026496-21ssh09:46:440
81850750,0irq/46-4a10000015201-21runrttasks09:41:280
78812750,0chrt31226-21kworker/u2:409:01:250
300292750,0chrt17089-21kworker/u2:207:53:440
250972756,0sleep025105-21sh12:01:310
20162750,0chrt1814-21kworker/u2:108:23:250
81950740,0irq/47-4a1000003190-21kworker/u2:210:07:430
81950740,0irq/47-4a10000026065-21kworker/u2:007:29:510
81950740,0irq/47-4a10000023869-21ntpq07:14:570
81850740,0irq/46-4a1000009059-21diskmemload11:23:430
81850740,0irq/46-4a1000002934-21apt-get08:30:190
288432740,0chrt27560-21kworker/u2:007:45:010
81950730,0irq/47-4a1000005772-21sshd08:47:220
81950730,0irq/47-4a10000027756-21sshd07:38:210
307652730,0sleep030452-21kworker/u2:107:58:450
81950720,0irq/47-4a100000480-21sshd08:13:210
81950720,0irq/47-4a10000031836-21sshd08:05:220
81850720,0irq/46-4a1000008608-21sshd09:06:230
71022720,0chrt31226-21kworker/u2:408:56:160
62462710,0chrt31226-21kworker/u2:408:50:180
268692700,0sleep026814-21kworker/u2:107:32:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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