[ardour-dev] Re: Beta 28 from CVS mtc??

[Fernando Lopez-Lezcano]

On Tue, 2005-03-29 at 05:33, David Mulcahy wrote:
> Hello 
> I might be out of my depth a bit here but just a suggestion.  I remember 
> reading that you have to prioritise the irq of your soundcard to get low 
> latency (with some settings eg preempt desktop or realtime) on a 2.6 kernel.  
> Now I dont use CCRMA so i dont know if that is setup to work like that out 
> the box. 

It is (ahem, should be :-)
It uses the rtirq script that Rui Nuno Capela wrote. 
Anyway, if there are problems with latency and/or timing I would first
check that priorities are being ordered correctly (run
/etc/rc.d/init.d/rtirq status to know the current status). 

-- Fernando

> If it is setup for that then it might not set the RTC irq (you do 
> need this for MTC sync dont you?) to a higher priority.  Just a suggestion 
> maybe someone may be able to clarify that.
> 
> Dave
>
> On Tuesday 29 March 2005 10:20, Per Sigmond wrote:
> > Quoting Geoff Beasley <songshop at bizmedia.com.au>:
> > >  Hey,
> > >  I compiled Ardour Beta 28 from CVS this morning hoping to test out
> > > Per's MTC patch. I applied the patches manually last week on 2 machines
> > > both running Slackware 10, Ardour beta 28, Alsa 1.0.8 and had incredible
> > > results! Then today I tried the Ardour CVS tarball, running Fedora Core 3
> > > / CCRMA, jack 99.54, Alsa 1.0.8 and had mixed results.
> >
> > For the record, I have had bad results with regards to timing/latency using
> > the CCRMA 2.6 kernels for FC3. Actually so bad that I reverted to FC1 and
> > 2.4 :-(.
> >
> > Anyone else had problems with these kernels? Could be that they don't like
> > my dual-P3 hardware...
> >
> > Regards,
> > Per.
> > --
> > Per Sigmond
> > Gjert Sorensensvei 5
> > 4879 Grimstad