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2025-12-12 - 09:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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  Congatec
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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 100 highest latencies:
System rackeslot8s.osadl.org (updated Fri Dec 12, 2025 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
37459969911694,1157cyclictest40054872sleep33
37459969911512,1146cyclictest40707782sleep33
3745996992118,1cyclictest0-21swapper/33
3745996992118,1cyclictest0-21swapper/33
3745996992017,1cyclictest0-21swapper/33
3745996991916,1cyclictest0-21swapper/33
374599699189,5cyclictest4054095-21turbostat3
3745996991815,1cyclictest0-21swapper/33
3745996991714,1cyclictest0-21swapper/33
374599699171,10cyclictest37987852sleep33
40124882160,4sleep04012496-21ssh0
3745996991613,1cyclictest0-21swapper/33
3745996991513,1cyclictest0-21swapper/33
3745996991513,1cyclictest0-21swapper/33
3745996991513,0cyclictest0-21swapper/33
3745996991513,0cyclictest0-21swapper/33
3745996991512,1cyclictest0-21swapper/33
3745996991512,1cyclictest0-21swapper/33
3745996991512,1cyclictest0-21swapper/33
3745996991512,1cyclictest0-21swapper/33
374599699151,11cyclictest4111454-21taskset3
40467522145,3sleep14047598-21irqrtprio1
38969442140,4sleep1874094-21kworker/1:1+events1
38178182141,3sleep03817851-21apt-get0
374599699145,6cyclictest40941382sleep33
374599699141,9cyclictest41357822sleep33
374599699141,9cyclictest38808012sleep33
3745996991412,1cyclictest0-21swapper/33
3745996991412,1cyclictest0-21swapper/33
3745996991412,1cyclictest0-21swapper/33
3745996991412,1cyclictest0-21swapper/33
3745996991412,1cyclictest0-21swapper/33
3745996991412,0cyclictest0-21swapper/33
3745996991412,0cyclictest0-21swapper/33
3745996991411,1cyclictest0-21swapper/33
3745996991411,1cyclictest0-21swapper/33
3745996991411,1cyclictest0-21swapper/33
3745996991411,1cyclictest0-21swapper/33
3745996991411,1cyclictest0-21swapper/33
3745996991411,1cyclictest0-21swapper/33
374599699141,10cyclictest8846-21taskset3
374599699141,10cyclictest4133948-21taskset3
374599699141,10cyclictest3997403-21chrt3
374599699141,10cyclictest3956422-21taskset3
374599699141,10cyclictest3932542-21taskset3
374599699141,10cyclictest3785740-21turbostat3
374599699141,10cyclictest25851-21taskset3
3745996991410,1cyclictest0-21swapper/33
374599699140,11cyclictest4181672-21chrt3
190898140,3rtkit-daemon1928-21sendmail-mta0
190898140,10rtkit-daemon3747482-21irqrtprio1
40444402130,1sleep23940362-21kworker/2:0+mm_percpu_wq2
374599699134,7cyclictest3861506-21taskset3
374599699131,9cyclictest4165889-21taskset3
374599699131,9cyclictest4013949-21taskset3
374599699131,9cyclictest3930318-21taskset3
374599699131,9cyclictest3907962-21taskset3
374599699131,9cyclictest3873939-21taskset3
374599699131,9cyclictest3810684-21taskset3
374599699131,8cyclictest38431952sleep33
3745996991312,0cyclictest0-21swapper/33
3745996991312,0cyclictest0-21swapper/33
3745996991312,0cyclictest0-21swapper/33
3745996991311,1cyclictest0-21swapper/33
374599699131,10cyclictest3971113-21taskset3
3745996991310,1cyclictest0-21swapper/33
374599699130,11cyclictest3973163-21chrt3
228392131,10sleep022993-21grep0
39714582125,1sleep0171rcu_preempt0
38822952120,2sleep13884257-21grep1
374599699127,3cyclictest38622172sleep33
374599699124,6cyclictest40627092sleep33
374599699121,9cyclictest4037341-21chrt3
374599699121,9cyclictest3855299-21taskset3
374599699120,9cyclictest4192933-21taskset3
374599699120,9cyclictest4147228-21taskset3
374599699120,10cyclictest3823876-21taskset3
190898120,7rtkit-daemon3880768-21sed1
40521422110,8sleep04052150-21ssh0
38871432111,8sleep23887296-21/usr/sbin/munin2
38179232110,4sleep23817819-21/usr/sbin/munin2
37733712111,6sleep13773404-21apt-get1
190898110,3rtkit-daemon667-21snmpd2
190898110,2rtkit-daemon3830686-21apt-get1
38431642100,1sleep23843194-21awk2
255002102,4sleep025516-21apt-get0
190898100,6rtkit-daemon4003838-21ssh0
190898100,6rtkit-daemon3867004-21memory1
190898100,6rtkit-daemon3767320-21/usr/sbin/munin1
190898100,5rtkit-daemon4117807-21ssh0
190898100,5rtkit-daemon4085431-21ssh0
190898100,5rtkit-daemon4062100-21ssh0
190898100,5rtkit-daemon4043458-21ntp_states0
190898100,4rtkit-daemon4127525-21cat0
190898100,4rtkit-daemon4127525-21cat0
190898100,3rtkit-daemon81364-21packagekitd1
8122291,4sleep08130-21ssh0
4192344291,5sleep04192423-21ntp_states0
4181368291,5sleep24181671-21sed2
4176830291,5sleep24178939-21kthreadcore2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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