Date: Mon, 5 Oct 2009 12:04:46 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Eugene Grosbein <eugen@kuzbass.ru> Cc: rihad <rihad@mail.ru>, freebsd-net@freebsd.org Subject: Re: dummynet dropping too many packets Message-ID: <20091005100446.GA60244@onelab2.iet.unipi.it> In-Reply-To: <20091005095600.GA73335@svzserv.kemerovo.su> 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>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Oct 05, 2009 at 05:56:00PM +0800, Eugene Grosbein wrote: > On Mon, Oct 05, 2009 at 02:28:58PM +0500, rihad wrote: > > > Oh, I almost forgot... Right now I've googled up and am reading this > > intro: http://www-rp.lip6.fr/~sf/WebSF/PapersWeb/iscc01.ps > > > > So turning to GRED would turn my FreeBSD router from dumb into a smart > > router that knows TCP? I thought pushing bits around at a lower level, > > and a sufficient queue size were enough. > > No, it will still deal with IP packets but more clever. > > > Still not sure why increasing queue size as high as I want doesn't > > completely eliminate drops. > > 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) cheers luigi
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20091005100446.GA60244>