From owner-freebsd-hackers@FreeBSD.ORG  Sat Sep 27 10:16:00 2008
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 4FB74106569C;
	Sat, 27 Sep 2008 10:16:00 +0000 (UTC)
	(envelope-from rwatson@FreeBSD.org)
Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42])
	by mx1.freebsd.org (Postfix) with ESMTP id 26DD48FC27;
	Sat, 27 Sep 2008 10:16:00 +0000 (UTC)
	(envelope-from rwatson@FreeBSD.org)
Received: from fledge.watson.org (fledge.watson.org [65.122.17.41])
	by cyrus.watson.org (Postfix) with ESMTP id B42AE46B46;
	Sat, 27 Sep 2008 06:15:59 -0400 (EDT)
Date: Sat, 27 Sep 2008 11:15:59 +0100 (BST)
From: Robert Watson <rwatson@FreeBSD.org>
X-X-Sender: robert@fledge.watson.org
To: Danny Braniss <danny@cs.huji.ac.il>
In-Reply-To: <E1KjEZw-000KkH-GP@cs1.cs.huji.ac.il>
Message-ID: <alpine.BSF.1.10.0809271114450.20117@fledge.watson.org>
References: <E1Kj7NA-000FXz-3F@cs1.cs.huji.ac.il>
	<20080926081806.GA19055@icarus.home.lan>
	<E1Kj9bR-000H7t-0g@cs1.cs.huji.ac.il>
	<20080926095230.GA20789@icarus.home.lan>
	<E1KjEZw-000KkH-GP@cs1.cs.huji.ac.il>
User-Agent: Alpine 1.10 (BSF 962 2008-03-14)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: freebsd-hackers@freebsd.org, Jeremy Chadwick <koitsu@FreeBSD.org>,
	freebsd-stable@freebsd.org
Subject: Re: bad NFS/UDP performance 
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 27 Sep 2008 10:16:00 -0000

On Fri, 26 Sep 2008, Danny Braniss wrote:

> after more testing, it seems it's related to changes made between Aug 4 and 
> Aug 29 ie, a kernel built on Aug 4 works fine, Aug 29 is slow. I'l now try 
> and close the gap.

I think this is the best way forward -- skimming August changes, there are a 
number of candidate commits, including retuning of UDP hashes by mav, my 
rwlock changes, changes to mbuf chain handling, etc.

Thanks,

Robert N M Watson
Computer Laboratory
University of Cambridge