Date: Mon, 05 Oct 2009 10:03:16 -0700 From: Julian Elischer <julian@elischer.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: rihad <rihad@mail.ru>, Eugene Grosbein <eugen@kuzbass.ru>, freebsd-net@freebsd.org Subject: Re: dummynet dropping too many packets Message-ID: <4ACA26D4.2080102@elischer.org> 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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Luigi Rizzo wrote: >> 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) it all depends on the characteristics of the traffic you need different queue lengths if it is just a small number of high speeed sessions (and mayne a large number of slow speed sessions), or if it is a larger number of medium speed sessions. Is it possible to know what sessions are losing packets?
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