From owner-freebsd-net@FreeBSD.ORG  Thu Mar  1 16:40:47 2007
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
X-Original-To: freebsd-net@freebsd.org
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id AFF9016A407
	for <freebsd-net@freebsd.org>; Thu,  1 Mar 2007 16:40:47 +0000 (UTC)
	(envelope-from andre@freebsd.org)
Received: from c00l3r.networx.ch (c00l3r.networx.ch [62.48.2.2])
	by mx1.freebsd.org (Postfix) with ESMTP id 1C96513C461
	for <freebsd-net@freebsd.org>; Thu,  1 Mar 2007 16:40:46 +0000 (UTC)
	(envelope-from andre@freebsd.org)
Received: (qmail 33480 invoked from network); 1 Mar 2007 16:13:30 -0000
Received: from dotat.atdotat.at (HELO [62.48.0.47]) ([62.48.0.47])
	(envelope-sender <andre@freebsd.org>)
	by c00l3r.networx.ch (qmail-ldap-1.03) with SMTP
	for <gallatin@cs.duke.edu>; 1 Mar 2007 16:13:30 -0000
Message-ID: <45E7020D.2000605@freebsd.org>
Date: Thu, 01 Mar 2007 17:40:45 +0100
From: Andre Oppermann <andre@freebsd.org>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US;
	rv:1.8b) Gecko/20050217
MIME-Version: 1.0
To: Andrew Gallatin <gallatin@cs.duke.edu>
References: <45E6E2E8.5060408@freebsd.org>
	<17894.61337.772803.325091@grasshopper.cs.duke.edu>
In-Reply-To: <17894.61337.772803.325091@grasshopper.cs.duke.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-net@freebsd.org, freebsd-current@freebsd.org, rwatson@freebsd.org,
	kmacy@freebsd.org
Subject: Re: Large TCP send socket buffer optimizations
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 01 Mar 2007 16:40:47 -0000

Andrew Gallatin wrote:
> Andre Oppermann writes:
>  > This patch solves the problem by maintaining an offset pointer in the socket
>  > buffer to give tcp_output() the closest mbuf right away avoiding the traversal
>  > from the beginning.
>  > 
>  > With this patch we should be able to compete nicely for the Internet land
>  > speed record again.
> 
> Great news.  I will test soon.
> 
> Have you found the bug which makes a freebsd sender spew
> duplicate acks?  This will have a negative affect on
> any benchmarks..

No, not yet.  And my current test environment doesn't lend itself to reproduce
the bug easily.  I'm very likely to need further input from you and will send
you some patches for instrumentation in the near future.

-- 
Andre