From owner-cvs-all Sat Jan 25 1: 4: 4 2003 Delivered-To: cvs-all@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5F60A37B401 for ; Sat, 25 Jan 2003 01:04:03 -0800 (PST) Received: from scribble.fsn.hu (scribble.fsn.hu [193.224.40.95]) by mx1.FreeBSD.org (Postfix) with SMTP id C022643F5B for ; Sat, 25 Jan 2003 01:03:58 -0800 (PST) (envelope-from bra@fsn.hu) Received: (qmail 4633 invoked by uid 1000); 25 Jan 2003 09:03:52 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 25 Jan 2003 09:03:52 -0000 Date: Sat, 25 Jan 2003 10:03:52 +0100 (CET) From: Attila Nagy To: Nate Lawson Cc: cvs-all@FreeBSD.org, "" Subject: Re: cvs commit: src/sys/i386/i386 identcpu.c initcpu.c locore.s In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Hello, > I'm not sure what you mean by "weaker". Slower. At least that's what I'd think after reading this: http://docs.freebsd.org/cgi/getmsg.cgi?fetch=53860+0+archive/2002/freebsd-smp/20020526.freebsd-smp > If you have code that is multi-process and it runs faster on an SMP > system than a single CPU system, then it is likely to run faster with > HTT than without. I asked my question because I read some posts from the opensource world which said: "when I turned off SMT I got better results". So the question was this: in the current state of the 4.x tree, will someone really benefit from enabling hyperthreading, or it is better to switch it off? Of course this depends on the application, but maybe there are some advices and experiences to be shared with the average Joe user, like me ;) But it is very likely that this question is much more difficult to answer than a "yes" or "no". ----------[ Free Software ISOs - http://www.fsn.hu/?f=download ]---------- Attila Nagy e-mail: Attila.Nagy@fsn.hu Free Software Network (FSN.HU) phone @work: +361 210 1415 (194) cell.: +3630 306 6758 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message