From owner-freebsd-hackers@FreeBSD.ORG  Fri Oct 10 20:58:41 2003
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id A5ED216A4B3
	for <freebsd-hackers@freebsd.org>;
	Fri, 10 Oct 2003 20:58:41 -0700 (PDT)
Received: from c211-28-27-130.belrs2.nsw.optusnet.com.au
	(c211-28-27-130.belrs2.nsw.optusnet.com.au [211.28.27.130])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 436AE43F3F
	for <freebsd-hackers@freebsd.org>;
	Fri, 10 Oct 2003 20:58:40 -0700 (PDT)
	(envelope-from peterjeremy@optushome.com.au)
Received: from server.c211-28-27-130.belrs2.nsw.optusnet.com.au
	(localhost.c211-28-27-130.belrs2.nsw.optusnet.com.au [127.0.0.1])
	ESMTP id h9B3wTdb007825;	Sat, 11 Oct 2003 13:58:29 +1000 (EST)
	peter@server.c211-28-27-130.belrs2.nsw.optusnet.com.au)
Received: (from peter@localhost)
	(8.12.9p1/8.12.9/Submit) id h9B3wRYO007824;
	Sat, 11 Oct 2003 13:58:27 +1000 (EST)	(envelope-from peter)
Date: Sat, 11 Oct 2003 13:58:27 +1000
From: Peter Jeremy <peterjeremy@optushome.com.au>
To: Andrew Gallatin <gallatin@cs.duke.edu>
Message-ID: <20031011035827.GD75796@server.c211-28-27-130.belrs2.nsw.optusnet.com.au>
References: <20031010103640.6F5A216A4BF@hub.freebsd.org>
	<20031010134400.GE803@saboteur.dek.spc.org>
	<16263.1019.939450.708832@grasshopper.cs.duke.edu>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <16263.1019.939450.708832@grasshopper.cs.duke.edu>
User-Agent: Mutt/1.4.1i
cc: freebsd-hackers@freebsd.org
Subject: Re: Determining CPU features / cache organization from userland
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
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, 11 Oct 2003 03:58:41 -0000

On Fri, Oct 10, 2003 at 03:09:47PM -0400, Andrew Gallatin wrote:
>
>Bruce M Simpson writes:
> > I've been thinking we should definitely make the cache organization
> > info available via sysctl. I am thinking we should do this to make
> > the UMA_ALIGN_CACHE definition mean something...
>
>If you do this,  it may make sense to use the same names as MacOSX.
>
>g51% sysctl hw | grep cache
>hw.cachelinesize: 128
>hw.l1icachesize: 65536
>hw.l1dcachesize: 32768
>hw.l2cachesize: 524288

What if your hardware has different linesizes for different caches?

Peter