From owner-freebsd-questions@FreeBSD.ORG  Mon Dec 22 08:29:40 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1F888106564A;
	Mon, 22 Dec 2008 08:29:40 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl
	[IPv6:2001:4070:101:2::1])
	by mx1.freebsd.org (Postfix) with ESMTP id C1DE08FC19;
	Mon, 22 Dec 2008 08:29:38 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (localhost [IPv6:::1])
	by wojtek.tensor.gdynia.pl (8.14.3/8.14.3) with ESMTP id mBM8TVML017283;
	Mon, 22 Dec 2008 09:29:31 +0100 (CET)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
	by wojtek.tensor.gdynia.pl (8.14.3/8.14.3/Submit) with ESMTP id
	mBM8TVJg017280; Mon, 22 Dec 2008 09:29:31 +0100 (CET)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Mon, 22 Dec 2008 09:29:31 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Ivan Voras <ivoras@freebsd.org>
In-Reply-To: <gimg6d$5id$1@ger.gmane.org>
Message-ID: <20081222092818.N17220@wojtek.tensor.gdynia.pl>
References: <200812202039.NAA10290@lariat.net> <gimg6d$5id$1@ger.gmane.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: freebsd-questions@freebsd.org
Subject: Re: Status of hyperthreading in FreeBSD
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Dec 2008 08:29:40 -0000

>
> Atom's HTT is actually pretty good - I saw up to 25% more performance
> simply by using multithreading in 7zip's compression benchmark (on
> WinXP, though). Of course, OTOH it uses about that much more transistors
> on the CPU die so it's not exactly free performance.

really that much? i thought maybe 1-2% (just 2 sets of registers).

it would be better to put 2 much simpler cores in place of this one.

or 100 ARM7 cores ;) (it would fit)