Date: Mon, 5 Oct 2009 20:00:57 +0800 From: Eugene Grosbein <eugen@kuzbass.ru> To: rihad <rihad@mail.ru> Cc: freebsd-net@freebsd.org Subject: Re: dummynet dropping too many packets Message-ID: <20091005120057.GA79942@svzserv.kemerovo.su> In-Reply-To: <4AC9DD72.9060802@mail.ru> References: <20091005061025.GB55845@onelab2.iet.unipi.it> <4AC9B400.9020400@mail.ru> <20091005090102.GA70430@svzserv.kemerovo.su> <4AC9BC5A.50902@mail.ru> <20091005095600.GA73335@svzserv.kemerovo.su> <20091005100446.GA60244@onelab2.iet.unipi.it> <20091005100532.GC73335@svzserv.kemerovo.su> <4AC9C88A.5050509@mail.ru> <20091005113037.GA77999@svzserv.kemerovo.su> <4AC9DD72.9060802@mail.ru>
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On Mon, Oct 05, 2009 at 04:50:10PM +0500, rihad wrote: > >>Where has TCP slow-start gone? My router box > >>isn't some application proxy that starts downloading at full 100 mbit/s > >>thus quickly filling client's 1 mbit/s link. It's just a router. > > > >While there is no or little competition for bandwidth from the router > >to clients, TCP would work just fine. I suspect your shaping policy > >makes heavy competition between clients. In this case, TCP behaves > >not-so-well without help of router's good shaping algorythms > >and taildrop is not good one. > > > > Nothing fancy (i.e. no competition). Only tons of per-user pipes > simulating the given throughput. You've mentioned previously: "The pipes are fine, each normally having 100-120 concurrent consumers (i.e. active users)." This IS competition between TCP flows inside each pipe. Eugene Grosbein
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