From owner-freebsd-net@FreeBSD.ORG Tue Nov 3 06:58:55 2009 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1DA1610656A4 for ; Tue, 3 Nov 2009 06:58:55 +0000 (UTC) (envelope-from glenbarner@australia.edu) Received: from mail-yw0-f178.google.com (mail-yw0-f178.google.com [209.85.211.178]) by mx1.freebsd.org (Postfix) with ESMTP id DB4558FC26 for ; Tue, 3 Nov 2009 06:58:54 +0000 (UTC) Received: by ywh8 with SMTP id 8so5377361ywh.3 for ; Mon, 02 Nov 2009 22:58:54 -0800 (PST) MIME-Version: 1.0 Received: by 10.150.45.3 with SMTP id s3mr9591129ybs.330.1257231534177; Mon, 02 Nov 2009 22:58:54 -0800 (PST) Date: Tue, 3 Nov 2009 14:58:54 +0800 Message-ID: <5794edfe0911022258r25d1ea0cr9d503c36575273f4@mail.gmail.com> From: glenn Barber To: freebsd-net@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: dummynet dropping too many packets X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Nov 2009 06:58:55 -0000 >Seems to me that spending money on a real packetshaper would be a >better investment than donating to compromise on the free stuff (not >that I'd want to discourage anyone from contributing to FreeBSD >generally). >Your problem is that at high traffic levels you need to reduce traffic >flows, not just delay it as dummynet does. The entire point of traffic >shaping is to smooth out your traffic flows; not to make it so choppy >that you have packets sitting in a transmit queue for 1/2 millisecond >in addition to the dummynet delays. While dummynet may not be dropping >packets, you have packets being dropped in TCP stacks throughout your >customer base, most likely. >Barney Packetshaper? It can't work over 300M/s.