From owner-freebsd-current@FreeBSD.ORG  Tue Jan 16 22:54:05 2007
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: freebsd-current@freebsd.org
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id B66BB16A415
	for <freebsd-current@freebsd.org>; Tue, 16 Jan 2007 22:54:05 +0000 (UTC)
	(envelope-from asmrookie@gmail.com)
Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.191])
	by mx1.freebsd.org (Postfix) with ESMTP id 4BF0813C442
	for <freebsd-current@freebsd.org>; Tue, 16 Jan 2007 22:54:05 +0000 (UTC)
	(envelope-from asmrookie@gmail.com)
Received: by nf-out-0910.google.com with SMTP id k27so19645nfc
	for <freebsd-current@freebsd.org>; Tue, 16 Jan 2007 14:54:04 -0800 (PST)
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta;
	h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth;
	b=FQXxjNI+hmujRtHN43EE6O3G07cq3vnDWSzdVlOwM/oqSL488XRwzoR9Fgf+P9kBLDsrjjFv0/CCBAR8yWM6thRDvc2zFFHzWSNX7krMvsKyM3VDNIeFXJAiHiWbHnQcNweGCopyEOvSMM5ET1NLP8VBmvjaVjvtlhPgN8mkeUs=
Received: by 10.49.12.4 with SMTP id p4mr33046nfi.1168988043791;
	Tue, 16 Jan 2007 14:54:03 -0800 (PST)
Received: by 10.48.238.9 with HTTP; Tue, 16 Jan 2007 14:54:03 -0800 (PST)
Message-ID: <3bbf2fe10701161454m74bd9356i3999187515c60596@mail.gmail.com>
Date: Tue, 16 Jan 2007 23:54:03 +0100
From: "Attilio Rao" <attilio@freebsd.org>
Sender: asmrookie@gmail.com
To: "Ivan Voras" <ivoras@fer.hr>
In-Reply-To: <eoji7s$cit$2@sea.gmane.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
References: <3bbf2fe10607250813w8ff9e34pc505bf290e71758@mail.gmail.com>
	<3bbf2fe10607250814m1a476f09p2d962dedc0c99be1@mail.gmail.com>
	<200607251232.51230.jhb@freebsd.org>
	<3bbf2fe10607251004wf94e238xb5ea7a31c973817f@mail.gmail.com>
	<3bbf2fe10607261127p3f01a6c3w80027754f7d4e594@mail.gmail.com>
	<3bbf2fe10607281004o6727e976h19ee7e054876f914@mail.gmail.com>
	<3bbf2fe10701160851r79b04464m2cbdbb7f644b22b6@mail.gmail.com>
	<20070116154258.568e1aaf@pleiades.nextvenue.com>
	<b1fa29170701161355lc021b90o35fa5f9acb5749d@mail.gmail.com>
	<eoji7s$cit$2@sea.gmane.org>
X-Google-Sender-Auth: c9bda9979a1f9f15
Cc: freebsd-current@freebsd.org, freebsd-arch@freebsd.org
Subject: Re: [PATCH] Mantaining turnstile aligned to 128 bytes in i386 CPUs
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 16 Jan 2007 22:54:05 -0000

2007/1/16, Ivan Voras <ivoras@fer.hr>:
> Kip Macy wrote:
> > x86 pre-P4 had 32-byte cache lines. Thus older processors will not benefit.
>
> But it does seem to hurt the performance a bit - maybe it's time to add
> another CPU option like I586_CPU and I686_CPU?

Well, it is my feeling that probabilly the align_cache parameter
should be a run-time settled parameter (in particular for ia32 CPUs
which changed a lot along the years).

Attilio


-- 
Peace can only be achieved by understanding - A. Einstein