Re: [LAU] Are RT-patches needed anymore? (Was Re: >= 2.6.27 RT ETA?)

On Thu, Jan 29, 2009 at 01:08:02PM -0800, Ken Restivo wrote:
> On Tue, Jan 27, 2009 at 06:16:33PM +0100, Peder Hedlund wrote:
> > Quoting Svend-Erik Kj?r Madsen <sv-e@email-addr-hidden-e.dk>:
> >
> > > On tir, 2009-01-27 at 15:03 +0100, Cassiel wrote:
> > >
> > >>
> > >> 5.3ms latencies: If you can't sense it... you don't need it
> > > I just ran a few test with a keyboard playing both the keyboard's
> > > soundmodule and through midi and Qsynth, and I must admit that latency
> > > was down to 1.3 ms before the audible time differece disapeard.
> >
> > Ok, I have to admit to lying; I only managed to go down to 5.8 ms
> > (128/44100/2).
> > But, then again, I'm running a generic vendor kernel (2.6.25.11) on a
> > seven years old CPU. I'd imagine a modern CPU being able to go lower,
> > so my question remains:
> > Has anyone with a modern PC tried to go low-latency with a non-patched kernel?
> >
>
> My requirements are very specific: I play live with other musicians, via MIDI, and it's funk music, and I play bass through my Linux laptop. Therefore, I have to be locked in with the drummers. When I hit the 1, it has to be right on top of the kick drum. I also use a lot of softsynths, and I'm playing live, so Xruns are unacceptable. Consistently LOW latency with no Xruns and CPU-intensive softsynths are very important to me.
>
> That said, my current setup is a 2.33Ghz Core 2 Duo with a RT kernel and JACK set to -r 44100 -P 128 -n 3, using a USB soundcard and USB MIDI keyboard. I haven't calculated out what latency that is in milliseconds, but whatever it is, so far it works fine for me. It feels like I'm playing an actual instrument, not a sluggish computer.

i have a 2.00 GHz Core 2 Duo, with jack set to -r 44100 -p 64 -n 3....
no xruns. running 2.6.28 vanilla.

so what ?

-- 
torben Hohn
http://galan.sourceforge.net -- The graphical Audio language
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