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2025-07-07 - 02:20

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 Sun Jul 06, 2025 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
818502000,0irq/46-4a100000392-21kworker/0:207:05:110
23679911824,0cyclictest20739-21ssh11:26:490
23679911643,0cyclictest81850irq/46-4a10000011:49:590
23679910445,0cyclictest81850irq/46-4a10000010:43:080
2367999933,0cyclictest0-21swapper10:51:340
2367999231,0cyclictest0-21swapper09:12:590
2367999131,0cyclictest0-21swapper09:16:520
81850810,0irq/46-4a10000022256-21runrttasks12:39:230
81850760,0irq/46-4a10000030340-21ssh10:38:120
81850740,0irq/46-4a10000015063-21ssh10:05:190
81850700,0irq/46-4a1000008466-21kworker/u2:412:12:500
81850700,0irq/46-4a1000004933-21ssh12:02:200
81850700,0irq/46-4a10000022539-21kworker/u2:610:55:360
81850700,0irq/46-4a10000017729-21kworker/u2:310:15:110
81850700,0irq/46-4a10000014019-21kworker/u2:611:15:190
81850700,0irq/46-4a10000010996-21kworker/u2:209:59:020
81850690,0irq/46-4a1000003526-21ssh09:40:360
81850690,0irq/46-4a10000023173-21kworker/u2:211:33:000
81850690,0irq/46-4a10000021138-21kworker/u2:109:26:140
81850690,0irq/46-4a10000019983-21kworker/u2:609:36:440
81850690,0irq/46-4a10000011112-21kworker/u2:111:37:190
81850680,0irq/46-4a1000006839-21chrt12:06:220
81850680,0irq/46-4a100000560-21kswapd011:10:420
81850680,0irq/46-4a10000032291-21kworker/u2:312:29:530
81850680,0irq/46-4a10000028906-21kworker/u2:007:30:200
81850680,0irq/46-4a10000022539-21kworker/u2:610:25:080
81850680,0irq/46-4a10000017730-21kworker/u2:410:11:490
81850670,0irq/46-4a1000008605-21kworker/u2:009:52:150
81850670,0irq/46-4a10000026944-21kworker/u2:309:23:100
81850670,0irq/46-4a10000026825-21kworker/u2:411:42:070
81850670,0irq/46-4a10000022067-21kworker/u2:409:31:110
81850670,0irq/46-4a10000016214-21kworker/u2:012:30:560
81850670,0irq/46-4a10000015812-21kworker/u2:010:24:300
81850650,0irq/46-4a1000008007-21kworker/u2:311:02:280
81850650,0irq/46-4a1000003839-21kworker/u2:509:49:220
81850650,0irq/46-4a10000024921-21kworker/u2:110:32:440
81850650,0irq/46-4a10000012566-21latency_hist09:59:590
81850650,0irq/46-4a10000010833-21kworker/u2:608:10:210
81850640,0irq/46-4a10000014019-21kworker/u2:611:21:440
81850630,0irq/46-4a1000004671-21kworker/u2:112:16:020
81850630,0irq/46-4a10000010370-21apt-get08:00:190
81850620,0irq/46-4a1000000-21swapper10:45:010
81850620,0irq/46-4a1000000-21swapper07:14:560
81850600,0irq/46-4a1000000-21swapper11:59:510
81850580,0irq/46-4a1000000-21swapper08:49:520
81850570,0irq/46-4a1000000-21swapper11:51:490
81850550,0irq/46-4a1000000-21swapper12:20:160
2367995544,0cyclictest81850irq/46-4a10000011:05:080
81850540,0irq/46-4a1000006970-1kworker/u3:007:39:510
2367995430,0cyclictest0-21swapper07:44:510
101540,0ktimersoftd/00-21swapper08:33:260
101530,0ktimersoftd/00-21swapper08:22:060
101530,0ktimersoftd/00-21swapper07:25:100
2367995242,0cyclictest101ktimersoftd/007:14:530
2367995241,0cyclictest81850irq/46-4a10000008:58:010
2367995240,0cyclictest81850irq/46-4a10000008:19:520
2367995141,0cyclictest81850irq/46-4a10000008:09:520
2367995141,0cyclictest101ktimersoftd/009:03:280
2367995140,0cyclictest81850irq/46-4a10000007:45:030
2367995034,0cyclictest4656-21runrttasks07:22:030
2367994939,0cyclictest81850irq/46-4a10000007:59:510
2367994933,0cyclictest18961-21latency_hist08:54:530
2367994833,0cyclictest14587-21latency_hist08:24:540
2367994731,0cyclictest16362-21sshd08:37:120
2367994729,0cyclictest7742-21kworker/u2:007:49:520
2367994729,0cyclictest16695-21kworker/u2:508:44:530
81850460,0irq/46-4a10000018458-1kworker/u3:009:09:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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