From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Iwai Subject: Re: Period Size in ymf724 Date: Mon, 23 Sep 2002 12:59:36 +0200 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: References: <3D8E94DF.E13DB0E8@multitech.co.in> Mime-Version: 1.0 (generated by SEMI 1.14.4 - "Hosorogi") Content-Type: text/plain; charset=US-ASCII Return-path: Received: from Cantor.suse.de (ns.suse.de [213.95.15.193]) by alsa.alsa-project.org (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) with ESMTP id MAA18307 for ; Mon, 23 Sep 2002 12:59:39 +0200 In-Reply-To: <3D8E94DF.E13DB0E8@multitech.co.in> Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Shaju Abraham Cc: ALSA development List-Id: alsa-devel@alsa-project.org At Mon, 23 Sep 2002 09:43:20 +0530, Shaju Abraham wrote: > > Hi all, > We tried using a ymf724 pci sound card and observed that the > minimum period size we can get is 944 bytes.( with -F switch of aplay). > We had tried the same switch of aplay with a cmipci card and the minimum > period size we could get was about only 64 bytes. unfortuantely both cards can't work with such a small period size. i don't think any consumer card works with 64 bytes per period. > > Basically, we are trying this 'cos we want the card to raise interrupts > as frequently as possible. > > Is this a h/w limitation of ymf724 card or is there any way we can get > to reduce the period size on a ymf724 card to around 64 bytes ? no. ymf724 produces interrupts with a fixed frequency (256/48000 = 5.333 msec), independent from the buffer or period size. Takashi ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf