El lun, 22-07-2002 a las 13:24, Takashi Iwai escribió: > Hi, > > At 20 Jul 2002 14:05:33 +0200, > Santiago Otero wrote: > > > > El vie, 19-07-2002 a las 19:19, Takashi Iwai escribi�: > > > Hi, > > > > > > i just added the support of scatter-gather (sg) dma support on some chips. > > > some chips such like via686 and emu10k1 have sg dma function, which > > > enables to use discontiguous pages as buffer. hence we'll have almost > > > no memory allocation problem on these chips. > > > > > > on via686 and emu10k1, the playback (and capture for via686) buffers > > > are no longer preallocated but allocated always dynamically > > > (preallocation doesn't make sense for sg buffers). > > > > > > on via686 driver, there is a new constraint. the period byte size > > > must be in power of two, to make sure that the period is aligned to > > > the kernel page size. i don't believe that this matters, though. > > > > > > there are some other chips with this function, via8233, intel8x0 and > > > trident. they will be supported eventually soon. (the porting must > > > be easy but i have no hardware :) > > > > > > > > > anyway, if you have an emu10k1 or via686 soundchip, please test the > > > latest cvs version of alsa-kernel/alsa-driver. > > > > > > > > I've got a via686. I've tested cvs version of alsa-driver and here are > > my results: > > -OSS emulation works fine > > -xmms, mplayer, xine, ogg123 work fine > > ok. thanks for your tests. > > > -all my own applications that before were working now sound bad. I am > > working on the problem > > this might be related with the period size restriction. > how did you set the period size? > please check /proc/asound/card0/pcm0p/sub0/hw_params and > which condition is used. > > I was using default period size. Setting period size to 1024 makes my application work again.
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