On Fri, 30 Jan 2009 03:05:11 +0100 torbenh@xxxxxx 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@xxxxxxx>: > > > > > > > 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 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
