Date: Mon, 5 Oct 2009 18:05:32 +0800 From: Eugene Grosbein <eugen@kuzbass.ru> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: rihad <rihad@mail.ru>, freebsd-net@freebsd.org Subject: Re: dummynet dropping too many packets Message-ID: <20091005100532.GC73335@svzserv.kemerovo.su> In-Reply-To: <20091005100446.GA60244@onelab2.iet.unipi.it> References: <4AC8A76B.3050502@mail.ru> <20091005025521.GA52702@svzserv.kemerovo.su> <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>
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On Mon, Oct 05, 2009 at 12:04:46PM +0200, Luigi Rizzo wrote: > > The goal is to make sources of traffic to slow down, this is the only > > way to descrease drops - any finite queue may be overhelmed with traffic. > > Taildrop does not really help with this. GRED does much better. > > i think the first problem here is figure out _why_ we have > the drops, as the original poster said that queues are configured > with a very large amount of buffer (and i think there is a > misconfiguration somewhere because the mbuf stats do not make > sense) That may be very simple, f.e. wide uplink channel and policy that dictates slower client speeds. Any taildrop queue would drop lots of packets. Eugene Grosbein
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