Date: Mon, 10 Dec 2007 12:03:53 -0800 From: Luigi Rizzo <rizzo@icir.org> To: Chuck Swiger <cswiger@mac.com> Cc: rihad <rihad@mail.ru>, freebsd-net@freebsd.org Subject: Re: Pipe queues Message-ID: <20071210120353.B40679@xorpc.icir.org> In-Reply-To: <DCFF3417-FC01-4F2C-ACA5-03CC0881DE59@mac.com>; from cswiger@mac.com on Mon, Dec 10, 2007 at 11:22:33AM -0800 References: <475D6FD7.2000500@mail.ru> <DCFF3417-FC01-4F2C-ACA5-03CC0881DE59@mac.com>
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On Mon, Dec 10, 2007 at 11:22:33AM -0800, Chuck Swiger wrote: > On Dec 10, 2007, at 8:56 AM, rihad wrote: > > Hi, > > > > I'm having a hard time to understand what pipe queues are with > > respect to bandwidth limitation. ipfw(8) and dummynet(4) manuals > > didn't help me much. > > Pipes and queues are two different things; a pipe simulates a network > link, and a queue is used to hold packets which are backlogged because > they are arriving faster than the outbound link (ie, a pipe) can > transmit them. > > > How does dummynet's traffic shaping function? > > It uses a variant of weighted fair queuing. actually the shaping uses a leaky bucket algorithm. The weighted fair queuing is the queue management scheme used when you have multiple queues attached to the same pipe cheers luigihome | help
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