[LAU] : jack CPU % is going crazy !

[Pieter Palmers]

Mysth-R wrote:
> I forgot to precise that my sound card is a Presonus Firebox and run 
> with Freebob.
> I got the idea to test with my U-control Uca202 (Behringer) Usb 
> sound-card, and there is no problems. The cpu percent is quite stable 
> around 2,1%.
> It is a bit strange because I got the rtirq script congiured for my 
> firewire card. So it should not work better than my firewire ...
> 
> I am a bit lost !!  :O[

Is the 'real' cpu time (e.g. from top) also that high? It could be that 
there is a bug in the time reporting of the freebob backend, resulting 
in a bad calculation of the cpu time.

Greets,

Pieter



> 
> 2008/4/6, Mysth-R <mysthr21 at gmail.com <mailto:mysthr21 at gmail.com>>:
> 
>     Hi, and thank you for your answer.
> 
>     I am actually trying qjackctl 0.2.23 and the problem is the same. So
>     it should not be a QT problem.
>     Anyway, I can note that for the same qjackctl config the cpu load
>     percent is lower on version 0.2.23  (~= 2.5 - 3%) than on the 0.3.2
>     version (3 - 4.5%).
> 
>     If someone has anonther Idea ... :)
>     Cheers,
> 
>     Mysth-R
> 
>     2008/4/5, Russell Hanaghan <hanaghan at starband.net
>     <mailto:hanaghan at starband.net>>:
> 
>         Sounds similar to the issue I spoke of here a week ago.
>         If its the latest Qjackctl built with QT4, its a QT4 problem of yet
>         to be defined origin. Only difference I had, going by your
>         description, was that
>         My CPU was running at 99% and staying there.
> 
>         If you run jack from the command line and see normal Cpu, this
>         would point to the same problem.
> 
>         I have not yeilded a root cause from my Googling. Only some 
>         similar instances from other users, not only with Qjackctl & Qsynth,
>         but also Skype and others built with QT4.
> 
>         My fix for now was to revert to an older version of qjackctl.
> 
>         Thanks!
> 
> 
> 
>         On Apr 5, 2008, at 10:26 AM, Mysth-R <mysthr21 at gmail.com
>         <mailto:mysthr21 at gmail.com>> wrote:
> 
>>         Hello list,
>>         Since I have installed Gentoo I got some issue with JACK. I am
>>         using Jackdmp
>>         When I run qjackctl all is right but the CPU percent, in spite
>>         of staying around 3 or 4% it is moving : 4% then 3 %, then it
>>         passes to 27% then 10% and 53% and 4%  ...
>>
>>         I don't understand very well what it is going wrong.
>>         My config :  gentoo 64 bits version on a Dell Insprion 9400
>>         Intel Core Duo 2 T7200 with 2 Go Ram.
>>         Firstly I had installed jack 0.109 and the issue was worse
>>         that jackdmp :sometimes CPU load until 80%
>>
>>         The kernel I use was compiled by my own. Perhpas I forgot an
>>         option or something...
>>         uname -a  :
>>         2.6.24-rt1 #4 SMP PREEMPT RT Sun Mar 16 21:42:41:CET 2008 x86_64 Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz GenuineIntel GNU/Linux
>>
>>         Thank you very much for your help.
>>
>>         Cheers,
>>         Mysth-R
>>
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