On Fri 27 Jan 06, 1:17 PM, Micah J. Cowan <[EMAIL PROTECTED]> said: > On Fri, Jan 27, 2006 at 04:05:23PM -0500, Peter Jay Salzman wrote: > > On Fri 27 Jan 06, 12:50 PM, Bill Kendrick <[EMAIL PROTECTED]> said: > > > On Fri, Jan 27, 2006 at 05:06:09AM -0500, Peter Jay Salzman wrote: > > > > Digital extraction is where the cd is read, and the signal gets pumped > > > > through the ATA port to your speakers. This is more efficient from the > > > > CPU's standpoint. > > > > > > Woah, I would think this is way LESS efficient. > > > > No. The CPU is involved in many read-copy operations when the signal passes > > through the sound card. > > > > AFAIK, the north and south bridge use DMA during digital extraction. > > Pete, I'm pretty sure that the CPU isn't even /involved/ with analog > mode. It's analog. There is no read/copy. There's nothing to read/copy. sure there is.
data needs to be copied from kernel space to user space. that _definitely_ requires the CPU. that's why the whole "zero-copy user-space access" was such a big deal. pete _______________________________________________ vox-tech mailing list [email protected] http://lists.lugod.org/mailman/listinfo/vox-tech
