HDSP and buffer pre-allocation

HDSP and buffer pre-allocation

[Takashi Iwai]

Hi,

right now I committed patches to change the behavior of snd-page-alloc
and snd-hdsp/rme9652.  Now /proc/drivers/snd-page-alloc file accepts
the write, so that user can do pre-allocation more flexibly.

A brief note is found in Documentation/ALSA-Configuration.txt.  What
you'd need to do is:

1. load snd-page-alloc in the boot sequence (modprobe snd-page-alloc),
   e.g. /etc/init.d/rc.local

2. Write to /proc/drivers/snd-page-alloc with the proper parameters
   e.g. for HDSP,

	add 0x10ee 0x3fc5 0 1769472 2

   which will allocate two buffers of 1769472 bytes for the device
   1033:3fc5 (HDSP's pci id).

The buffers will be kept as long as snd-page-alloc module is loaded
and unless "erase" command is issued.  So, replugging the hdsp card
should work better now.


Takashi


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