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2026-07-02 - 00:10

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

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: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot4s.osadl.org (updated Wed Jul 01, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2380082994844,3cyclictest2600055-21kworker/u8:1+flush-259:011:25:001
2380082994340,2cyclictest2442034-21kworker/u8:0+flush-259:008:15:001
2380089994236,4cyclictest2453432-21latency_hist08:20:013
2380082994138,2cyclictest2495167-21kworker/u8:0+events_unbound09:25:011
2380079994137,2cyclictest2619760-21kworker/u8:3+flush-259:011:08:410
2380082993936,2cyclictest2443134-21kworker/u8:4+flush-259:008:30:001
2380082993935,3cyclictest2600055-21kworker/u8:1+flush-259:011:30:111
2380079993936,2cyclictest211rcuc/012:10:000
2380082993734,2cyclictest2640269-21kworker/u8:2+flush-259:011:40:241
2380089993632,3cyclictest2505913-21kworker/u8:2+flush-259:011:00:233
2380082993634,1cyclictest2671295-21kworker/u8:3+flush-259:012:25:251
2380089993427,4cyclictest2671268-21latency_hist11:50:013
2380085993428,4cyclictest2400638-21latency_hist07:30:002
2380082993431,2cyclictest2385250-21kworker/u8:2+flush-259:007:40:001
2380079993430,3cyclictest2552604-21kworker/u8:0+flush-259:010:20:180
2380089993329,3cyclictest2505913-21kworker/u8:2+flush-259:010:30:173
2380082993329,3cyclictest2458619-21kworker/u8:5+flush-259:008:40:251
2380085993225,5cyclictest2567831-21latency_hist10:10:012
2380079993228,3cyclictest2645519-21kworker/u8:0+flush-259:011:45:160
2380079993225,5cyclictest2484847-21latency_hist08:50:010
2380085993124,5cyclictest2718712-21latency_hist12:35:012
2380082993128,2cyclictest2458619-21kworker/u8:5+events_unbound09:10:011
2380079993128,2cyclictest2442034-21kworker/u8:0+flush-259:008:20:170
2380079993128,2cyclictest2385250-21kworker/u8:2+flush-259:007:25:000
2380079993127,3cyclictest2600055-21kworker/u8:1+flush-259:011:40:010
2380082993026,3cyclictest2364409-21kworker/u8:3+events_unbound07:26:121
2380079993023,5cyclictest2702804-21latency_hist12:20:000
2380085992922,4cyclictest2511016-21latency_hist09:15:012
2380082992926,2cyclictest2385250-21kworker/u8:2+flush-259:008:40:001
2380085992822,4cyclictest2656032-21/usr/sbin/munin11:35:192
2380082992825,2cyclictest2600055-21kworker/u8:1+events_unbound10:55:171
2380082992824,3cyclictest2645758-21apt-get11:25:111
2380082992822,5cyclictest2583217-21latency_hist10:25:001
2380079992824,3cyclictest2417193-21apt-get07:45:120
2380079992822,4cyclictest2577204-21ntpq10:15:210
2380089992722,4cyclictest2364409-21kworker/u8:3+flush-259:007:45:003
2380089992721,4cyclictest335557-21systemd-journal09:09:103
2380085992721,4cyclictest2385628-21diskstats07:15:142
2380082992723,3cyclictest2505913-21kworker/u8:2+flush-259:011:00:101
2380082992723,3cyclictest2505913-21kworker/u8:2+events_unbound09:48:251
2380079992724,2cyclictest2385250-21kworker/u8:2+flush-259:008:00:000
2380079992723,3cyclictest2505913-21kworker/u8:2+flush-259:010:50:240
2380079992721,4cyclictest2624879-21latency_hist11:05:010
2380089992621,4cyclictest2600055-21kworker/u8:1+flush-259:012:20:003
2380085992622,3cyclictest2640269-21kworker/u8:2+flush-259:012:00:222
2380082992623,2cyclictest2640269-21kworker/u8:2+flush-259:012:15:191
2380082992622,3cyclictest2521380-21kworker/u8:1+events_unbound09:32:111
2380079992622,3cyclictest2640269-21kworker/u8:2+events_unbound11:23:100
2380089992518,6cyclictest2530806-21ntpq09:30:363
2380085992519,4cyclictest2703069-21apt-get12:20:132
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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