From owner-freebsd-stable@FreeBSD.ORG  Wed Dec 20 09:37:41 2006
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
X-Original-To: freebsd-stable@freebsd.org
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 7137C16A403
	for <freebsd-stable@freebsd.org>; Wed, 20 Dec 2006 09:37:41 +0000 (UTC)
	(envelope-from markir@paradise.net.nz)
Received: from smtp3.clear.net.nz (smtp3.clear.net.nz [203.97.33.64])
	by mx1.FreeBSD.org (Postfix) with ESMTP id BE6AC43C9F
	for <freebsd-stable@freebsd.org>; Wed, 20 Dec 2006 09:37:40 +0000 (GMT)
	(envelope-from markir@paradise.net.nz)
Received: from [192.168.1.11]
	(121-72-71-65.dsl.telstraclear.net [121.72.71.65]) by
	smtp3.clear.net.nz
	(CLEAR Net Mail) with ESMTP id <0JAK00M1UG2Q6D40@smtp3.clear.net.nz>
	for
	freebsd-stable@freebsd.org; Wed, 20 Dec 2006 22:37:39 +1300 (NZDT)
Date: Wed, 20 Dec 2006 22:37:32 +1300
From: Mark Kirkwood <markir@paradise.net.nz>
In-reply-to: <200612200618.12826.joao@matik.com.br>
To: JoaoBR <joao@matik.com.br>
Message-id: <4589045C.1050206@paradise.net.nz>
MIME-version: 1.0
Content-type: text/plain; charset=ISO-8859-1; format=flowed
Content-transfer-encoding: 7bit
References: <45888C68.10305@paradise.net.nz>
	<200612200618.12826.joao@matik.com.br>
User-Agent: Thunderbird 1.5.0.8 (X11/20061129)
Cc: freebsd-stable@freebsd.org
Subject: Re: Cached file read performance with 6.2-PRERELEASE
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 20 Dec 2006 09:37:41 -0000

JoaoBR wrote:
> On Tuesday 19 December 2006 22:05, Mark Kirkwood wrote:

>> $ dd of=/dev/null if=/tmp/file bs=32k                  # read it
>> 819200000 bytes transferred in 1.801944 secs (454620117 bytes/sec)
>>
> 
> 
> hum, look my releng_6:

> # dd of=/dev/null if=/c/c1/file bs=32k
> 819200000 bytes transferred in 0.896507 secs (913768635 bytes/sec)
> 

Hmm - so your machine reads memory twice as fast as mine, which is 
great! but I'm not sure it actually shows anything useful ... let me 
guess - a P4 with DDR or DDR2 memory??? maybe if we look a bit harder at 
buffer cache performance you could get 1.2GB/s or more - wouldn't that 
be a good thing?

Cheers

Mark