[asterisk-dev] DSP pci board.

[Mike Taht]

On 3/22/06, Wai Wu <wwu at calltrol.com> wrote:


I was thinking just patching,  say "codec_gsm.c"

GSM is a codec that was optimized for early mips processors back in the
early 90s, and more or less flies on a modern processor. (the only way I can
think of to make it go faster on a modern architecture would be to do
multiple channels of gsm encodings/decodings in the same pass)

I would argue that the only  codecs worth patching for a DSP would be the
higher overhead speex and  g72x  codecs.

Even then the price of the virt->phys kernel transition required for the
userspace asterisk to talk to a kernelspace dsp is probably way too high. A
good place for a dsp is in a pots card like the digium T1 cards, where the
interface to the data can run purely in kernel space.


-----Original Message-----
> From: asterisk-dev-bounces at lists.digium.com
> [mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of BJ Weschke
> Sent: Wednesday, March 22, 2006 5:07 PM
> To: Asterisk Developers Mailing List
> Subject: Re: [asterisk-dev] DSP pci board.
>
> On 3/22/06, Wai Wu <wwu at calltrol.com> wrote:
> >
> > Hi all,
> >
> > Has been poking through the * source code a bit and trying to identify
>
> > the most CPU demanding piece of code. Is trans-coding the most CPU
> > demanding? I happen to have access to a DSP pci board. If I can move
> > the encoder/decoder off the host processor onto the DSP board, will I
> > get a decent performance boost for an * PSTN gateway for VoIP phones
> > (assuming all VoIP phones are using say g732, g729 or gsm)?
> > _______________________________________________
>
>
> You will get a performance increase, but then you'd also have to write
> Asterisk drivers for it.
>
>
> --
> Bird's The Word Technologies, Inc.
> http://www.btwtech.com/
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--
Mike Taht
PostCards From the Bleeding Edge
http://the-edge.blogspot.com
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