From owner-freebsd-stable@FreeBSD.ORG  Wed Dec 20 09:37:37 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 0C57D16A412
	for <freebsd-stable@freebsd.org>; Wed, 20 Dec 2006 09:37:37 +0000 (UTC)
	(envelope-from freebsd-stable@m.gmane.org)
Received: from ciao.gmane.org (main.gmane.org [80.91.229.2])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 8533143C9F
	for <freebsd-stable@freebsd.org>; Wed, 20 Dec 2006 09:37:35 +0000 (GMT)
	(envelope-from freebsd-stable@m.gmane.org)
Received: from list by ciao.gmane.org with local (Exim 4.43)
	id 1Gwxt6-0006qH-5E
	for freebsd-stable@freebsd.org; Wed, 20 Dec 2006 10:37:24 +0100
Received: from lara.cc.fer.hr ([161.53.72.113])
	by main.gmane.org with esmtp (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <freebsd-stable@freebsd.org>; Wed, 20 Dec 2006 10:37:24 +0100
Received: from ivoras by lara.cc.fer.hr with local (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <freebsd-stable@freebsd.org>; Wed, 20 Dec 2006 10:37:24 +0100
X-Injected-Via-Gmane: http://gmane.org/
To: freebsd-stable@freebsd.org
From: Ivan Voras <ivoras@fer.hr>
Date: Wed, 20 Dec 2006 10:37:13 +0100
Lines: 27
Message-ID: <emb089$lum$1@sea.gmane.org>
References: <45888C68.10305@paradise.net.nz>
	<200612200618.12826.joao@matik.com.br>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
X-Complaints-To: usenet@sea.gmane.org
X-Gmane-NNTP-Posting-Host: lara.cc.fer.hr
User-Agent: Thunderbird 1.5.0.4 (X11/20060625)
In-Reply-To: <200612200618.12826.joao@matik.com.br>
Sender: news <news@sea.gmane.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 09:37:37 -0000

JoaoBR wrote:

> hum, look my releng_6:
> 
> # dd of=/dev/null if=/c/c1/file bs=8k
> 100000+0 records in
> 100000+0 records out
> 819200000 bytes transferred in 1.017492 secs (805116851 bytes/sec)
> # dd of=/dev/null if=/c/c1/file bs=8k
> 100000+0 records in
> 100000+0 records out
> 819200000 bytes transferred in 1.015790 secs (806465915 bytes/sec)
> # dd of=/dev/null if=/c/c1/file bs=32k
> 25000+0 records in
> 25000+0 records out
> 819200000 bytes transferred in 0.896507 secs (913768635 bytes/sec)

Similar here (RELENG_6, a fairly slow P4/2Ghz):

> dd if=file of=/dev/null bs=8k
7690+1 records in
7690+1 records out
63003776 bytes transferred in 0.086171 secs (731146977 bytes/sec)
> dd if=file of=/dev/null bs=32k
1922+1 records in
1922+1 records out
63003776 bytes transferred in 0.070524 secs (893366745 bytes/sec)