At Mon, 17 Mar 2003 16:12:24 -0400, mjander wrote: > > hi, > > > > >i'm not sure how the aureal driver works. IIRC, it can use up to 4 x > >4k pages, right? if its size is really only 4 pages, i'd > recommend to > >use a simple phyically linear buffer. > > > > > >Takashi > > > > In the meanwhile i managed to use SG buffer by simply setting the > period max and minimal size to 0x1000 (4KiB). I even implemented a > page extender, such like the CSxxx patch that extends 2 physical > (4 in this case) periods into unlimited periods, but i couldn't > measure any improvement (less skipping on high load or the > like). So i think i better stay with linear buffers, and map the > physical pages in a linear fashion. > Using this approach the buffer size extender mechanism for more > periods is still possible.
yes. > What I still don't understand, after my experiments: Why should i > use Scatter Gather ? As far as i can tell, it doesnt provide any > advantage, except that you can use smaller chunks of memory when > larger ones arent avaiable. correct. the only advantage is the memory usage. > Someone talked about "the faster > Scatter Gather"... > Why "faster"? most likely it's a misunderstanding. for the hardware, it won't make difference regarding the speed (except for very tiny issues like cache, etc :) for the driver, as you noticed, it will even increase the work you need to do. ciao, Takashi ------------------------------------------------------- This SF.net email is sponsored by: Does your code think in ink? You could win a Tablet PC. Get a free Tablet PC hat just for playing. What are you waiting for? http://ads.sourceforge.net/cgi-bin/redirect.pl?micr5043en _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
