From owner-freebsd-hackers Wed Oct 8 23:51:35 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id XAA12994 for hackers-outgoing; Wed, 8 Oct 1997 23:51:35 -0700 (PDT) (envelope-from owner-freebsd-hackers) Received: from implode.root.com (implode.root.com [198.145.90.17]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id XAA12987 for ; Wed, 8 Oct 1997 23:51:32 -0700 (PDT) (envelope-from root@implode.root.com) Received: from implode.root.com (localhost [127.0.0.1]) by implode.root.com (8.8.5/8.8.5) with ESMTP id XAA26683; Wed, 8 Oct 1997 23:53:09 -0700 (PDT) Message-Id: <199710090653.XAA26683@implode.root.com> To: Joao Carlos Mendes Luis cc: hackers@FreeBSD.ORG Subject: Re: TCP problem In-reply-to: Your message of "Thu, 09 Oct 1997 00:13:32 -0200." <199710090213.AAA28099@gaia.coppe.ufrj.br> From: David Greenman Reply-To: dg@root.com Date: Wed, 08 Oct 1997 23:53:08 -0700 Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk >// >/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