On 14 Nov 2007, at 10:38, Daniel James wrote: > Hi Cory, > >> Some have said that moving the drawing of windows off the the GFX >> card >> would help the load on the CPU and thus keep xruns to a minimum. > > I'm sceptical about that, because drawing windows shouldn't be causing > xruns if the system is set up properly. I believe JACK Meterbridge > uses > libsdl for drawing the meter needles efficiently, but I believe most > free software audio apps don't do much in the way of graphics > acceleration (yet).
Actually, SDL is very inefficient, there was an alpha OpenGL version of meterbridge (which I've since lost) that was much, much more efficient. If you perform the same action on a 3D card and using the CPU the non average the 3D card will use less power to do the same work (it's optimised for that, whereas CPU are huge complex beasts). But, ofcourse Vista and Leopard aren't doing the same action as they would on the CPU. One problem with 3D cards is that they can (or could) cause XRUNs, as they sometimes hold the kernel busy waiting for some action on the card to return. I don't know if this happens with modern drivers and cards though. - Steve -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
