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2025-10-20 - 11:13

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 Mon Oct 20, 2025 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501570,0irq/47-4a1000001048-21kworker/u2:219:09:410
15129911319,0cyclictest26139-21munin-run23:39:590
15129910644,0cyclictest81850irq/46-4a10000021:23:250
1512999933,0cyclictest0-21swapper22:40:080
1512999933,0cyclictest0-21swapper00:13:220
1512999833,0cyclictest0-21swapper21:38:160
1512999730,0cyclictest0-21swapper23:53:310
1512999532,0cyclictest0-21swapper23:44:380
1512999532,0cyclictest0-21swapper23:24:470
1512999532,0cyclictest0-21swapper22:49:340
1512999531,0cyclictest0-21swapper21:41:540
1512999530,0cyclictest0-21swapper00:01:310
1512999432,0cyclictest0-21swapper22:57:310
1512999432,0cyclictest0-21swapper22:39:040
1512999132,0cyclictest0-21swapper22:00:020
1512999033,0cyclictest0-21swapper23:14:000
81850770,0irq/46-4a10000021154-21kworker/u2:321:32:010
81850760,0irq/46-4a10000022209-21ssh22:22:390
81850750,0irq/46-4a10000027847-21ssh22:34:440
81850740,0irq/46-4a10000011279-21ssh00:17:140
81850700,0irq/46-4a10000031531-21kworker/u2:023:55:150
81850690,0irq/46-4a10000019619-21chrt22:17:100
81850690,0irq/46-4a10000017587-21kworker/u2:221:10:470
81850690,0irq/46-4a10000012746-21seq00:20:140
81850680,0irq/46-4a1000003240-21kworker/u2:721:45:060
81850680,0irq/46-4a10000020302-21diskmemload23:00:100
81850670,0irq/46-4a1000007930-1kworker/u3:123:08:570
81850670,0irq/46-4a1000004603-1kworker/u3:219:40:040
81850670,0irq/46-4a10000023574-21kworker/u2:121:19:120
81850670,0irq/46-4a10000016673-21ssh22:10:470
81850660,0irq/46-4a10000024746-1kworker/u3:123:47:200
81850660,0irq/46-4a10000020264-21kworker/u2:000:39:130
81850650,0irq/46-4a10000027220-21kworker/u2:600:08:400
81850650,0irq/46-4a10000019590-21cut00:35:020
81850650,0irq/46-4a1000001510-21cyclictest23:32:200
81850630,0irq/46-4a1000007557-21kworker/u2:021:55:160
81850630,0irq/46-4a1000005351-1kworker/u3:119:35:230
81850630,0irq/46-4a1000001827-1kworker/u3:319:24:520
81850620,0irq/46-4a1000000-21swapper22:05:110
1512996251,0cyclictest81850irq/46-4a10000023:15:020
81850610,0irq/46-4a1000000-21swapper23:28:060
81850610,0irq/46-4a1000000-21swapper22:28:530
1512996149,0cyclictest81850irq/46-4a10000021:54:580
81850590,0irq/46-4a1000000-21swapper21:29:180
1512995948,0cyclictest81850irq/46-4a10000019:19:540
81850570,0irq/46-4a1000000-21swapper22:52:210
81850560,0irq/46-4a10000011647-1kworker/u3:220:20:260
81850560,0irq/46-4a1000000-21swapper00:25:290
81850550,0irq/46-4a1000000-21swapper20:04:530
1512995544,0cyclictest81850irq/46-4a10000019:12:390
1512995543,0cyclictest81850irq/46-4a10000019:59:530
101530,0ktimersoftd/00-21swapper19:28:300
1512995235,0cyclictest12201-21latency_hist20:14:540
101520,0ktimersoftd/00-21swapper20:08:290
1512995135,0cyclictest20185-21runrttasks21:09:060
1512995033,0cyclictest15164-21latency_hist20:34:540
1512995029,0cyclictest18233-21sshd20:55:220
1512994933,0cyclictest19451-21runrttasks21:04:060
1512994933,0cyclictest17340-21apt20:49:540
1512994932,0cyclictest15201-21runrttasks19:50:330
1512994832,0cyclictest8065-21sshd19:46:590
1512994830,0cyclictest14986-21sendmail-mta20:29:220
1512994737,0cyclictest101ktimersoftd/020:39:520
1512994630,0cyclictest5713-21runrttasks19:34:060
1512994630,0cyclictest12010-21runrttasks20:14:020
1512994629,0cyclictest15968-21latency_hist20:39:560
1512994531,0cyclictest15201-21runrttasks20:50:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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