On 3/22/06, Wai Wu <[EMAIL PROTECTED]> 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.
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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] 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 <[EMAIL PROTECTED]> 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/
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
asterisk-dev mailing list
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-dev
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
asterisk-dev mailing list
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-dev
--
Mike Taht
PostCards From the Bleeding Edge
http://the-edge.blogspot.com
_______________________________________________ --Bandwidth and Colocation provided by Easynews.com --
asterisk-dev mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-dev
