Date: Mon, 5 Oct 2009 21:56:32 +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: <20091005135632.GA89194@svzserv.kemerovo.su> In-Reply-To: <4AC9E415.9040801@mail.ru> References: <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> <20091005120057.GA79942@svzserv.kemerovo.su> <4AC9E415.9040801@mail.ru>
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On Mon, Oct 05, 2009 at 05:18:29PM +0500, rihad wrote: > >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. > > > Well, each user gets instantiated with a new copy of the pipe. Each such > user counts towards the limit imposed by hash_size*max_chain_len for > that pipe only. It would have been competition had I used dst-ip dst-ip > 0xffffff00 or similar and not dst-ip 0xffffffff, _then_ all 256 users > (determined by the mask) would compete for the pipe's bandwidth. So the > only competition is in the uplink at our main Cisco, I guess. Hmm, yes, you are rigth. I've missed 'mask'. Try to disable net.inet.ip.dummynet.io_fast to see if there is a bug in 'fast' dummynet mode. Eugene Grosbein
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