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To: Noritoshi Demizu <demizu@dd.iij4u.or.jp>
In-Reply-To: Message from Noritoshi Demizu <demizu@dd.iij4u.or.jp> of "Tue,
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Date: Tue, 12 Jul 2005 14:07:38 +0300
From: Danny Braniss <danny@cs.huji.ac.il>
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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 
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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