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:
>
>
>
> 2008/4/7, Pieter Palmers <pieterp@email-addr-hidden
> <mailto:pieterp@email-addr-hidden> <mailto: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.
>
>
>
> héhé :D
>
> 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...
>
>
> well, on the same laptop I got a 32bits openSuse system and a gentoo
> 64bits in dual boot.
> I have tested on OpenSuse, with both Kde3.5 and Fvwm, just using
> qjackctl 0.3.2 with jackd 0.109 and it works perfectly.
> Now on my gentoo 64 bits I tryed on both Kde4.0 and Fvwm-crystal, just
> using qjackctl 0.3.2 and jackdmp0.70. I also tryed with qjackctl 0.2.23
> (in case it was due to QT4 library) and jackdmp-svn and jackd 0.109 : in
> all the case I got the cpu load problem.
>
> Do you think this is a firewire problem ? perhaps I forgot an important
> option when I compiled my kernel (2.6.24-rt1)
> I think I will try with another kernel. Will see if there is new kernel
> available. otherwise I will try with an older (2.6.22 ...)
>
> Thank you for your answer.
>
> ps : pieter if you haven't tested freebob in 64 bits, perhaps you could
> give me some guidelines, to test it and make a report for you ?

I don't really have a clue about what's going on, so it's pretty
difficult to do so.

Can you try running jack/freebob with a very high priority (e.g. -P99)
to see if this changes things?

Greets,

Pieter
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Received on Mon Apr 7 20:15:02 2008