Date: Sun, 09 Mar 2008 09:33:36 -0700 From: Julian Elischer <julian@elischer.org> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-hackers@freebsd.org, Robert Watson <rwatson@freebsd.org> Subject: Re: Documentation on writing a custom socket Message-ID: <47D41160.9070901@elischer.org> In-Reply-To: <200803091027.39843.hselasky@c2i.net> References: <200803081133.02575.hselasky@c2i.net> <20080308171435.J88526@fledge.watson.org> <200803091027.39843.hselasky@c2i.net>
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Hans Petter Selasky wrote: > On Saturday 08 March 2008, Robert Watson wrote: >> On Sat, 8 Mar 2008, Hans Petter Selasky wrote: > >> For example, do you >> anticipate using or even needing the routing facilities, and how might you >> map ISDN telephony parts into the normal network stack infrastructure of >> addresses, routing, interfaces, etc? > > Hi Robert, > > ISDN is very simple. In the ISDN world there is a term called TEI which is the > Terminal Entity Identifier. This kind of like an IP address. > > Besides from the signalling there are 2 B-channels which can transport data or > audio. One of my goals is to achive zero copy when moving data to/from an > ISDN line and also in combination to Voice over IP. Currently data is moved > through userland (Asterisk typically) which is usable in the short term, but > in the long run I want this extra copying removed. The idea is that I can > route [IP] packets (mbufs) through various filters in the kernel without the > need for copy. Given the speed of ISDN connections, It is not worth doing zero copy on ISDN unless you have more than 1000 of them, which seems unlikely. given a total throughput of 128000 b/s and the speed of current hardware, the number of packets per second is probably not high enough to make the difference even noticable. > > --HPS > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
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