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2026-04-25 - 03:32

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 Sat Apr 25, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2325788994943,4cyclictest2558877-21cp22:55:001
2325788994540,3cyclictest2346324-21kworker/u8:1+flush-259:019:45:171
2325785994239,2cyclictest2564273-21kworker/u8:3+events_unbound00:10:230
2325795994036,3cyclictest2610509-21kworker/u8:0+flush-259:000:15:203
2325785994037,2cyclictest2475418-21kworker/u8:2+flush-259:021:45:000
2325785994037,2cyclictest2387505-21kworker/u8:1+flush-259:021:10:230
2325785993932,5cyclictest2414071-21diskstats20:35:130
2325791993731,4cyclictest2372423-21diskstats19:55:132
2325785993730,5cyclictest2365963-21ntpq19:45:220
2325785993633,2cyclictest2393071-21kworker/u8:3+flush-259:020:30:210
2325785993633,2cyclictest2346324-21kworker/u8:1+flush-259:019:50:200
2325785993629,5cyclictest2340252-21ntpq19:20:210
2325791993529,4cyclictest252-21systemd-journal19:25:242
2325785993532,2cyclictest2393071-21kworker/u8:3+flush-259:021:00:000
2325785993532,2cyclictest2387505-21kworker/u8:1+events_unbound20:15:150
2325785993528,5cyclictest2569810-21diskstats23:05:130
2325791993431,2cyclictest2393071-21kworker/u8:3+events_unbound20:45:162
2325788993430,3cyclictest2393071-21kworker/u8:3+flush-259:020:50:001
2325788993428,4cyclictest252-21systemd-journal19:52:241
2325785993431,2cyclictest2573652-21kworker/u8:1+flush-259:023:30:210
2325785993430,3cyclictest2475418-21kworker/u8:2+events_unbound21:55:010
2325788993327,4cyclictest2625907-21latency_hist00:00:011
2325785993330,2cyclictest2387505-21kworker/u8:1+flush-259:021:04:590
2325785993326,5cyclictest2511063-21ntpq22:05:200
2325788993226,4cyclictest2512209-21/usr/sbin/munin22:10:131
2325785993228,3cyclictest2304429-21kworker/u8:3+flush-259:019:10:230
2325791993126,4cyclictest509-21rs:main2
2325788993127,3cyclictest2475418-21kworker/u8:2+flush-259:022:45:191
2325788993126,3cyclictest2620770-21kworker/u8:2+events_unbound00:35:011
2325788993124,5cyclictest2407629-21ntpq20:25:221
2325785993127,3cyclictest2573652-21kworker/u8:1+events_unbound23:45:230
2325785993127,3cyclictest2507070-21kworker/u8:0+flush-259:022:10:230
2325785993127,3cyclictest2304429-21kworker/u8:3+events_unbound19:25:130
2325785993127,3cyclictest2282574-21kworker/u8:2+flush-259:019:55:160
232578599310,29cyclictest1-21systemd21:30:000
2325795993024,4cyclictest2449579-21latency_hist21:10:013
2325791993027,2cyclictest2387505-21kworker/u8:1+events_unbound20:55:182
2325791993026,3cyclictest2573652-21kworker/u8:1+flush-259:023:35:172
2325791993026,3cyclictest2573652-21kworker/u8:1+flush-259:023:35:162
2325785993026,3cyclictest2610509-21kworker/u8:0+events_unbound00:00:200
2325785993026,3cyclictest2610509-21kworker/u8:0+events_unbound00:00:010
2325788992923,4cyclictest2475658-21apt-get21:35:121
2325788992922,5cyclictest2542385-21ntpq22:35:211
2325788992921,5cyclictest2636189-21latency_hist00:10:001
2325785992925,3cyclictest2393071-21kworker/u8:3+events_unbound20:50:120
2325785992923,4cyclictest2480417-21apt-get21:38:200
2325791992824,3cyclictest2282574-21kworker/u8:2+events_unbound20:00:142
2325785992824,3cyclictest2610509-21kworker/u8:0+events_unbound00:15:150
2325785992824,3cyclictest2573652-21kworker/u8:1+events_unbound23:26:240
2325785992824,3cyclictest2475418-21kworker/u8:2+flush-259:022:45:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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