At Tue, 02 Mar 2004 11:16:33 +0100 (CET), Giuliano Pochini wrote: > > > On 02-Mar-2004 Manuel Jander wrote: > > >> Yes. Every driver using SG must do this. Look into bt87x.c or > >> via82xx.c for examples. > > > > Well, i guess in that case the period size loses any relevance in > > terms of efficiency. > > Efficiency about what ? If the hardware can be programmed to use > any period size, then the application is free to choose the size > it prefers. It's not a bad thing. NB: the interrupt should be > generated at the end of the period, not at the end of each block, > eg. when it crosses the page boundary.
well, it's ok to generate irqs at each page boundary, too, as long as the driver processes it properly, i.e. calling snd_pcm_period_elapsed() only at the irq of the end of period. of course, less irqs are better from the performance viewpoint. Takashi ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
