From owner-freebsd-net Sun Nov 5 14:12: 3 2000 Delivered-To: freebsd-net@freebsd.org Received: from piranha.amis.net (piranha.amis.net [212.18.32.3]) by hub.freebsd.org (Postfix) with ESMTP id 03EB837B479 for ; Sun, 5 Nov 2000 14:12:01 -0800 (PST) Received: from titanic.medinet.si (titanic.medinet.si [212.18.32.66]) by piranha.amis.net (Postfix) with ESMTP id 459AB5E89; Sun, 5 Nov 2000 23:11:59 +0100 (CET) Date: Sun, 5 Nov 2000 23:11:59 +0100 (CET) From: Blaz Zupan X-Sender: blaz@titanic.medinet.si To: David Greenman Cc: freebsd-net@freebsd.org Subject: Re: tcp sendspace/recvspace In-Reply-To: <200011052202.OAA24207@implode.root.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > I've been messing around with the net.inet.tcp.sendspace and > net.inet.tcp.recvspace parameters on ftp.freesoftware.com and have found > that there is a significant performance improvement when increasing these > to 32768 bytes. Apparantly there are enough systems out there with higher > window maxes that it really does make a difference. By significant > improvement, I mean about a average of a 20% increase in Mbps per user, > and this was just the change over a 30 minute period with lots of connections > still using the old 16K values. > Any objections to increasing the defaults in FreeBSD to 32K? I actually wanted to suggest the same some time ago. Some time ago I was trying to find out why a certain Linux box can download at much higher speed over a satellite link than a FreeBSD box. Well, the default TCP window size in Linux is higher. Increasing it on FreeBSD, more than doubled the transfer speed. Blaz Zupan, Medinet d.o.o, Linhartova 21, 2000 Maribor, Slovenia E-mail: blaz@amis.net, Tel: +386-2-320-6320, Fax: +386-2-320-6325 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message