From owner-freebsd-stable@FreeBSD.ORG Sat Dec 20 03:40:26 2003 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A728D16A4CE; Sat, 20 Dec 2003 03:40:26 -0800 (PST) Received: from mail-in.m-online.net (svr8.m-online.net [62.245.150.237]) by mx1.FreeBSD.org (Postfix) with ESMTP id C5AB243D39; Sat, 20 Dec 2003 03:40:21 -0800 (PST) (envelope-from h@schmalzbauer.de) Received: from mail.m-online.net (svr14.m-online.net [192.168.3.144]) by svr8.m-online.net (Postfix) with ESMTP id 82D7E5997; Sat, 20 Dec 2003 12:40:20 +0100 (CET) Received: from cale.flintsbach.schmalzbauer.de (ppp-62-245-208-244.mnet-online.de [62.245.208.244]) by mail.m-online.net (Postfix) with ESMTP id 21165259FC; Sat, 20 Dec 2003 12:40:20 +0100 (CET) From: Harald Schmalzbauer To: Scott Long , Mike Tancsa Date: Sat, 20 Dec 2003 12:40:12 +0100 User-Agent: KMail/1.5.4 References: <6.0.1.1.0.20031219172103.092e4c90@209.112.4.2> <20031219152927.V47291@pooker.samsco.home> In-Reply-To: <20031219152927.V47291@pooker.samsco.home> X-Birthday: 06 Oktober 1972 X-Name: Harald Schmalzbauer X-Phone1: +49 (0) 163 555 3237 X-Phone2: +49 (0) 89 18947781 X-Address: Munich, 80686 X-Country: Germany MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg=pgp-sha1; boundary="Boundary-02=_jUD5/BwmKvY3MGK"; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Message-Id: <200312201240.19385@harrymail> cc: stable@freebsd.org Subject: Re: to hyperthread or not to hyperthread X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Dec 2003 11:40:26 -0000 --Boundary-02=_jUD5/BwmKvY3MGK Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Content-Description: signed data Content-Disposition: inline On Friday 19 December 2003 23:34, Scott Long wrote: > On Fri, 19 Dec 2003, Mike Tancsa wrote: > > We are replacing a box that is fairly busy with many different processes > > (sendmail / pop3). The new MB and CPU is hyperthreading capable. Is it > > worth it to enable this ? Does anyone have any real world experiences > > with it in RELENG_4 that say one way or the other to use or not use it ? > > > > dmesg shows, > > > > CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (2992.52-MHz 686-class CPU) > > Origin =3D "GenuineIntel" Id =3D 0xf29 Stepping =3D 9 > > =20 > > Features=3D0xbfebfbff >MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,S SE2,SS,HTT,TM,PBE> > > Hyperthreading: 2 logical CPUs > > > > ---Mike > > HyperThreading usually requires special smarts in the OS process > scheduler so that the cores don't bottleneck each other with cache > thrashing and pipeline stalls/starvation. Without this, Hyperthreading > is usually slightly slower than non-Hyperthreading. 4.x does not have > a scheduler that understand HTT, but 5.2-CURRENT does. Do you mean ULE or 4BSD regarding HTT capable? Thanks, =2DHarry > > Scott > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" --Boundary-02=_jUD5/BwmKvY3MGK Content-Type: application/pgp-signature Content-Description: signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQA/5DUjBylq0S4AzzwRAtHvAKCOxS6zbG1+wEv4z21yvwj8zB/qCACfag/k tukeEGqOH5JteI2xFkX0g98= =hvqg -----END PGP SIGNATURE----- --Boundary-02=_jUD5/BwmKvY3MGK--