On Fri, 30 Jan 2009 03:05:11 +0100
torbenh@email-addr-hidden wrote:
> 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 ?
depends, depends..
load?
applications?
If you see xruns might also depend on your jack line as there seems to
be a bug that causes some xruns not to appear when -t is omitted.
...
Best,
Philipp
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Received on Sat Jan 31 00:15:04 2009
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