From owner-freebsd-questions@FreeBSD.ORG Wed Jul 22 20:34:11 2009 Return-Path: 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 F3A8C1065674 for ; Wed, 22 Jul 2009 20:34:10 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id A97F58FC2D for ; Wed, 22 Jul 2009 20:34:10 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1MTiVr-0001ZB-5w for freebsd-questions@freebsd.org; Wed, 22 Jul 2009 20:34:07 +0000 Received: from 93-138-121-235.adsl.net.t-com.hr ([93.138.121.235]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 22 Jul 2009 20:34:07 +0000 Received: from ivoras by 93-138-121-235.adsl.net.t-com.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 22 Jul 2009 20:34:07 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-questions@freebsd.org From: Ivan Voras Date: Wed, 22 Jul 2009 22:33:46 +0200 Lines: 39 Message-ID: References: <200907221157.n6MBvpKf028533@mp.cs.niu.edu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigE53D79695C2BF65D86E17A23" X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 93-138-121-235.adsl.net.t-com.hr User-Agent: Thunderbird 2.0.0.22 (Windows/20090605) In-Reply-To: <200907221157.n6MBvpKf028533@mp.cs.niu.edu> X-Enigmail-Version: 0.96.0 Sender: news Subject: Re: ULE and Prescott question X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Jul 2009 20:34:11 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigE53D79695C2BF65D86E17A23 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Scott Bennett wrote: > This is a curiousity question. I'm running 7.2-STABLE at present = on > an old Inspiron XPS, which has a 3.4 GHz P4 Prescott CPU. I have > hyperthreading enabled in the kernel. The question is: is there any > appreciable performance difference to be expected with this hardware se= tup > between the ULE scheduler and the 4BSD scheduler? Or does the fact tha= t > there is only one core eliminate any difference in performance > characteristics? I'd guess the second thing. It's not like there's cache to be shared between cores, etc. ULE might still be better simply because it is more modern. Anyway, all recent (7.1+) versions of FreeBSD ship with ULE as default, and all FreeBSD versions < 7.0 have broken/unfinished ULE. --------------enigE53D79695C2BF65D86E17A23 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkpnd68ACgkQldnAQVacBchd3wCfWWYyNLnkzaOtFGdwONEAWpSO iZQAnRGHys+/YZ9/G9RtUkBOwXcmY8UU =HsZj -----END PGP SIGNATURE----- --------------enigE53D79695C2BF65D86E17A23--