29 Jan
2009
29 Jan
'09
5:08 p.m.
On Tue, Jan 27, 2009 at 06:16:33PM +0100, Peder Hedlund wrote:
Quoting Svend-Erik Kj?r Madsen <sv-e(a)sv-e.dk>dk>:
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.
-ken
On tir, 2009-01-27 at 15:03 +0100, Cassiel
wrote:
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?
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.