From owner-freebsd-net Mon Jul 1 16:39:38 2002 Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id DF46237B400; Mon, 1 Jul 2002 16:39:32 -0700 (PDT) Received: from mail.rpi.edu (mail.rpi.edu [128.113.22.40]) by mx1.FreeBSD.org (Postfix) with ESMTP id 696FF43E0A; Mon, 1 Jul 2002 16:39:30 -0700 (PDT) (envelope-from drosih@rpi.edu) Received: from [128.113.24.47] (gilead.netel.rpi.edu [128.113.24.47]) by mail.rpi.edu (8.12.1/8.12.1) with ESMTP id g61NcRu5048364; Mon, 1 Jul 2002 19:38:28 -0400 Mime-Version: 1.0 X-Sender: drosih@mail.rpi.edu Message-Id: In-Reply-To: <200207012205.g61M5t0L008698@whizzo.transsys.com> References: <55379.1025557087@critter.freebsd.dk> <200207012205.g61M5t0L008698@whizzo.transsys.com> Date: Mon, 1 Jul 2002 19:38:26 -0400 To: "Louis A. Mamakos" From: Garance A Drosihn Subject: Re: ftp and mail much slower into fbsd 4.4 vs and old BSDi Cc: freebsd-hackers@FreeBSD.ORG, net@FreeBSD.ORG Content-Type: text/plain; charset="us-ascii" ; format="flowed" X-Scanned-By: MIMEDefang 2.3 (www dot roaringpenguin dot com slash mimedefang) Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org At 6:05 PM -0400 7/1/02, Louis A. Mamakos wrote: > >Why so many applications go to the trouble to disable Nagle's >algorithm is beyond me. I suspect the socket option has too >seductive of a name. I suspect someone had a specific case where Nagle's algorithm causes a real problem. They turn on TCP_NODELAY for that situation, see a huge improvement, and assume that it is a good idea to always turn on TCP_NODELAY. We had one case here were reloading a MOO database through a network connection took something like 5 hours. Turning on TCP_NODELAY reduced the time to about 10 minutes. We got all excited about that, and tried TCP_NODELAY in a number of other situations in the same MOO. In all other cases the option either hurt performance or did not help it enough to care about... -- Garance Alistair Drosehn = gad@gilead.netel.rpi.edu Senior Systems Programmer or gad@freebsd.org Rensselaer Polytechnic Institute or drosih@rpi.edu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message