Date: Sat, 27 Jan 2007 09:57:49 +0000 From: "Bruce M. Simpson" <bms@FreeBSD.org> To: Luigi Rizzo <rizzo@icir.org> Cc: freebsd-stable@freebsd.org Subject: Re: Dummynet and simulating random delay Message-ID: <45BB221D.3050508@FreeBSD.org> In-Reply-To: <20070124073602.B57678@xorpc.icir.org> References: <53B52415C756A84E8A169F0E3673A3290E8BA4@IMCSRV6.MITRE.ORG> <20070124071021.GG874@turion.vk2pj.dyndns.org> <20070124073602.B57678@xorpc.icir.org>
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Luigi Rizzo wrote: > On Wed, Jan 24, 2007 at 06:10:21PM +1100, Peter Jeremy wrote: > >> On Tue, 2007-Jan-23 14:22:54 -0500, Andresen, Jason R. wrote: >> >>> I have a project that requires me to simulate a link with varying but >>> well defined delay. The link is guarenteed to deliver packets in >>> order, so I wish to maintain that behavior with Dummynet. >>> >> I don't think dummynet can do this in its current form. Based on >> > > actually dummynet never does reordering within a single pipe, even > if you change the delay on the fly. > > But this said, you should explain "varying but well defined delay", > Hitting up Google reveals someone hacked Dummynet to introduce per-flow randomness in a uniform distribution: http://www.cs.unc.edu/~jeffay/dirt/FAQ/dummynet-modifications.html However, they included entire source files against FreeBSD 4.5; forward-porting should hopefully not be too tedious for an interested party. Regards, BMS
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