Re: [LAU] : jack CPU % is going crazy !

Mysth-R wrote:
>
>
> 2008/4/7, Pieter Palmers <pieterp@email-addr-hidden <mailto:pieterp@email-addr-hidden>>:
>
> 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
>
>
>
> Hi,
> It is very strange. I can't see a real correlation between cpu load
> displayed by htop and the DSP load displayed by qjackctl.
> In htop the cpu is quite unstable too, but it doesn'tt change at the
> same time as the dsp load in qjackctl. Perhaps it is due to a latency.
> but I can't say if is linked.
> I have made some more test :
>
> 1- runing qjackctl with freebob backend : both dsp load (qjackctl) and
> cpu load (htop) are unstable but not really linked.
> 2- runing qjackctl with alsa backend : dsp load is quite stable but cpu
> load is unstable.
> 3- running jackdmp in a console with Freebob then alsa : cpu load is
> unstable.
> 4- when jackdmp or qjackctl are killed : cpu load is normal around 2%
> and stable.
>
> So :
> Is it normal that the cpu load displayed in htop is unstable ?
> If it is, then as you said pieter, could it be a bug with freebob ??? I
> never saw this before, on the same laptop but with 32bits OS.
FreeBoB is guaranteed 110% bug-free.

> Is there a problem in my kernel config ?
> Is there a something wrong with jack or freebob with the 64bits arch ?
It could very well be a 64bit issue somewhere. I haven't tested freebob
on 64bit yet.

>
>
> Well, if someone as some idea for me to make more tests ... I would be
> happy ;)

It might be interesting if you could figure out exactly what the
differences are between your setups. Mainly software versions etc...

Greets,

Pieter
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Received on Mon Apr 7 16:15:03 2008