From owner-freebsd-questions@FreeBSD.ORG Thu Jan 13 11:07:02 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id F06CC16A4CE for ; Thu, 13 Jan 2005 11:07:02 +0000 (GMT) Received: from parrot.aev.net (host29-15.pool8174.interbusiness.it [81.74.15.29]) by mx1.FreeBSD.org (Postfix) with ESMTP id 71A0043D4C for ; Thu, 13 Jan 2005 11:06:59 +0000 (GMT) (envelope-from ml@netfence.it) Received: from soth.ventu (adsl-ull-16-6.41-151.net24.it [151.41.6.16]) (authenticated bits=128) by parrot.aev.net (8.13.1/8.13.1) with ESMTP id j0DBHvdn007474 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 13 Jan 2005 12:18:04 +0100 (CET) (envelope-from ml@netfence.it) Received: from netfence.it (xanatar.ventu [10.1.2.6]) (authenticated bits=0) by soth.ventu (8.13.1/8.12.10) with ESMTP id j0DB5Ct8059779 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 13 Jan 2005 12:05:13 +0100 (CET) (envelope-from ml@netfence.it) Message-ID: <41E65688.4010700@netfence.it> Date: Thu, 13 Jan 2005 12:07:52 +0100 From: Andrea Venturoli User-Agent: Mozilla/5.0 (OS/2; U; Warp 4.5; en-US; rv:1.6) Gecko/20040117 X-Accept-Language: it,en,fr,de MIME-Version: 1.0 To: freebsd-questions@freebsd.org References: <200501121049.j0CAnJQe028309@mp.cs.niu.edu> <828997113.20050112184556@wanadoo.fr> <41E58E53.7060606@netfence.it> <786252184.20050113014354@wanadoo.fr> In-Reply-To: <786252184.20050113014354@wanadoo.fr> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.45 Subject: Re: Hyperthreading hurts 5.3? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Jan 2005 11:07:03 -0000 Anthony Atkielski wrote: > Where these computations in which all threads were doing pretty much the > same thing? Not exactly the same algorithm and on different set of data. > And was it floating-point? Yes. > (Doesn't the processor have just one FPU, or something like that?) I don't really know (I made this test almost for fun and curiosity), but I really supposed this must be true. Anyway I saw both CPU at 100%. > An AMD processor will also melt or catch fire if the CPU fan fails, > whereas an Intel processor won't. In the past. Nowadays they have some sort of protection. BTW I've already seen a couple of (old) Athlons with a failing fan; they run overheated probably for months with occasional system lockups, but they are now working good with a new fan. I'll stop here, we are going OT (and flaming :)... bye av.