Date: Mon, 01 Feb 2010 18:28:05 +1100 From: Lawrence Stewart <lstewart@freebsd.org> To: Jerry Toung <jrytoung@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: TCP westwood Message-ID: <4B668285.1090605@freebsd.org> In-Reply-To: <86068e731001311449m605005cft7ebc6f8b984d6d96@mail.gmail.com> References: <86068e731001311449m605005cft7ebc6f8b984d6d96@mail.gmail.com>
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Hi Jerry, On 02/01/10 09:49, Jerry Toung wrote: > Hello list, > my employer is asking me to implement westwood, this is most likely happen > on 8.0. > > before I start, I'd like to know for what reason it hasn't been done in the > main tree? > is it that no one has had time, or it only work in a lab environment? may be > too many changes in the stack > and it's not trivial? etc... IMHO, lack of a really compelling reason is a good start. Changing the TCP stack is fiddly and error prone work. > Does any one out there has patch they can share? I haven't come across a BSD licenced implementation in my travels, although FreeBSD already does a few different types of bandwidth estimation and limiting (which, in their current form at least, I'm personally not a fan of). > would the project be interested in a patch if I do this? I'm interested in and actively working on this area in FreeBSD. I already have a patch available that adds modular congestion control support to FreeBSD's TCP stack which would be a good starting point for you. I would also be supportive of importing a Westwood congestion control module into FreeBSD after you complete it. Have a look at the project branches here: http://svn.freebsd.org/base/projects/tcp_cc_{7.x,8.x,head} Happy to discuss further when you're ready. Cheers, Lawrence
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