Date: Tue, 12 Jul 2005 14:07:38 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: Noritoshi Demizu <demizu@dd.iij4u.or.jp> Cc: David Malone <dwmalone@maths.tcd.ie>, freebsd-net@freebsd.org, freebsd-stable@freebsd.org, Luigi Rizzo <rizzo@icir.org> Subject: Re: tcp troughput weirdness Message-ID: <E1DsIbz-000DjF-MH@cs1.cs.huji.ac.il> In-Reply-To: Message from Noritoshi Demizu <demizu@dd.iij4u.or.jp> of "Tue, 12 Jul 2005 18:53:04 %2B0900." <20050712.185304.32727687.Noritoshi@Demizu.ORG>
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> > combining > > sysctl net.inet.tcp.sendspace=131072 > > and > > sysctl net.inet.tcp.inflight.enable=0 > > > > did the trick! > > Congratulations! But I wonder why the throughput of FreeBSD=>Linux > was almost equal to that of Linux=>FreeBSD. If the settings above > improves the throughput of FreeBSD=>FreeBSD, the throughput of > FreeBSD=>Linux would also be improved with them. Is it improved? > i did the sysctl on the client/sender :-) > > now can someone remind me what inflight does? > > In my understanding, it tries to estimate bandwidth-delay product and > tries to avoid injecting too much data segments into networks. > So, if it underestimates bandwidth-delay product, throughtput may be > reduced. > > Regards, > Noritoshi Demizu
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