Date: Sun, 5 Nov 2000 20:36:14 -0500 (EST) From: "Richard A. Steenbergen" <ras@e-gerbil.net> To: Kris Kennaway <kris@FreeBSD.ORG> Cc: David Greenman <dg@root.com>, freebsd-net@FreeBSD.ORG Subject: Re: tcp sendspace/recvspace Message-ID: <Pine.BSF.4.21.0011052035270.306-100000@overlord.e-gerbil.net> In-Reply-To: <20001105172400.A8778@citusc17.usc.edu>
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On Sun, 5 Nov 2000, Kris Kennaway wrote: > On Sun, Nov 05, 2000 at 02:02:44PM -0800, David Greenman wrote: > > 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? > > Won't this impact the latency of multiple connections over a slow PPP link? Thats what the congestion window is for. Any limitation of transmits based on the advertised memory limitation window is totally improper. -- Richard A Steenbergen <ras@e-gerbil.net> http://www.e-gerbil.net/humble PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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