Period Size in ymf724

Period Size in ymf724

[Shaju Abraham]

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.

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 ?

Thanx in advance,
Shaju Abraham



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Re: Period Size in ymf724

[Takashi Iwai]

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


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