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2026-04-27 - 02:54
OSADL QA Farm

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #e, slot #6

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 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 50 highest latencies:
System rackeslot6.osadl.org (updated Sun Apr 26, 2026 12:44:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)		T*(,W**)
latency
(µs)		CmdPIDPrioCmd
366124299119110,7cyclictest3701992-21latency_hist09:15:010
36612439910797,7cyclictest3768116-21latency_hist12:40:011
36612439910393,7cyclictest3719511-21latency_hist10:10:001
36612439910392,7cyclictest3661088-21kworker/u8:0+flush-179:007:39:591
3661243999482,9cyclictest3664339-21apt-get07:20:021
3661242999487,5cyclictest3741014-21kworker/u8:1+flush-179:011:15:250
3661242999286,5cyclictest3751950-21kworker/u8:0+flush-179:011:50:230
3661242999184,4cyclictest3684273-21kworker/u8:2+flush-179:009:30:010
3661242999183,5cyclictest3668056-21kworker/u8:3+events_unbound07:50:150
3661243999078,9cyclictest3716878-21diskstats10:00:141
3661242998781,5cyclictest3667678-21kworker/u8:1+events_unbound07:35:000
3661242998781,5cyclictest3667678-21kworker/u8:1+events_unbound07:35:000
3661242998777,6cyclictest3729043-21kworker/u8:2+flush-179:011:20:200
3661243998675,7cyclictest3684273-21kworker/u8:2+flush-179:008:55:001
3661243998672,10cyclictest3729043-21kworker/u8:2+flush-179:011:30:011
3661242998678,4cyclictest3693814-21kworker/u8:3+flush-179:009:05:210
3661242998678,4cyclictest3693814-21kworker/u8:3+flush-179:009:05:200
3661243998577,5cyclictest3727449-21kworker/u8:0+flush-179:010:35:011
3661242998579,4cyclictest3679430-21kworker/u8:0+flush-179:008:20:150
3661242998478,4cyclictest3656533-21kworker/u8:1+events_unbound07:15:010
3661242998476,6cyclictest3692430-21kworker/u8:1+flush-179:008:55:260
3661243998363,18cyclictest3684273-21kworker/u8:2+flush-179:009:00:001
3661242998377,4cyclictest3710006-21kworker/u8:3+flush-179:009:50:250
3661242998376,5cyclictest3661088-21kworker/u8:0+events_unbound07:15:250
3661242998274,6cyclictest3723753-21kworker/u8:2+flush-179:010:20:220
3661242998274,4cyclictest3679430-21kworker/u8:0+events_unbound08:40:150
3661242998173,5cyclictest3729043-21kworker/u8:2+flush-179:011:10:140
3661242998172,7cyclictest3703585-21latency_hist09:20:000
3661243998070,8cyclictest3714706-21kworker/u8:0+events_unbound09:55:001
3661242998075,4cyclictest3708347-21kworker/u8:1+flush-179:009:35:250
3661242998074,4cyclictest3684273-21kworker/u8:2+events_unbound09:30:220
3661242998072,6cyclictest3710006-21kworker/u8:3+events_unbound09:55:240
3661242997969,7cyclictest3763370-21kworker/u8:2+flush-179:012:30:200
3661242997969,7cyclictest3676494-21/usr/sbin/munin07:55:240
3661242997871,4cyclictest3684273-21kworker/u8:2+flush-179:009:00:140
3661242997870,6cyclictest3747148-21latency_hist11:35:020
3661242997870,6cyclictest3684273-21kworker/u8:2+flush-179:008:30:140
3661243997664,11cyclictest3729043-21kworker/u8:2+flush-179:010:59:551
3661242997670,4cyclictest3716293-21kworker/u8:1+events_unbound10:05:230
3661242997669,4cyclictest3693814-21kworker/u8:3+flush-179:009:20:260
3661242997668,6cyclictest3732301-21kworker/u8:3+flush-179:010:50:000
3661243997564,9cyclictest3674706-21kworker/u8:2+events_unbound08:00:001
3661242997567,5cyclictest3716293-21kworker/u8:1+flush-179:010:10:210
3661243997466,6cyclictest3761753-21latency_hist12:20:011
3661242997469,3cyclictest3737842-21kworker/u8:1+events_unbound11:05:200
3661242997469,3cyclictest3708347-21kworker/u8:1+flush-179:009:45:260
3661242997468,4cyclictest3763370-21kworker/u8:2+flush-179:012:35:230
3661243997366,5cyclictest3711557-21latency_hist09:45:001
3661243997365,6cyclictest3682626-21latency_hist08:15:001
3661242997367,5cyclictest3661088-21kworker/u8:0+events_unbound07:40:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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