Date: Wed, 08 Oct 1997 23:53:08 -0700 From: David Greenman <dg@root.com> To: Joao Carlos Mendes Luis <jonny@coppe.ufrj.br> Cc: hackers@FreeBSD.ORG Subject: Re: TCP problem Message-ID: <199710090653.XAA26683@implode.root.com> In-Reply-To: Your message of "Thu, 09 Oct 1997 00:13:32 -0200." <199710090213.AAA28099@gaia.coppe.ufrj.br>
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>// >/usr/sbin/sysctl -w net.inet.tcp.sendspace=65536 >// >/usr/sbin/sysctl -w net.inet.tcp.recvspace=65536 >// >// This is the cause of the problem. You really don't want to change these, >// anyway. You'll see the best performance at the default of 16KB. > >So, what's the good thing about RFC1323 ? RFC 1323 tries to address (among other things) a problem with getting high performance over high latency paths that also have a large amount of available bandwidth, such as might be the case with high speed satellite links. Most of the Internet backbone today is running at >100% utilization, however, so you could have an infinite window size and still not get any higher performance. In the case of communications over a high speed LAN, the latency isn't high enough for the bandwidth*delay product to become a problem. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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