From owner-freebsd-stable@FreeBSD.ORG Wed Feb 20 16:32:29 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8A41C16A401 for ; Wed, 20 Feb 2008 16:32:29 +0000 (UTC) (envelope-from freebsd-stable@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 0BD0313C442 for ; Wed, 20 Feb 2008 16:32:28 +0000 (UTC) (envelope-from freebsd-stable@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1JRrrv-0003wC-1y for freebsd-stable@freebsd.org; Wed, 20 Feb 2008 16:32:27 +0000 Received: from lara.cc.fer.hr ([161.53.72.113]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 20 Feb 2008 16:32:27 +0000 Received: from ivoras by lara.cc.fer.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 20 Feb 2008 16:32:27 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-stable@freebsd.org From: Ivan Voras Date: Wed, 20 Feb 2008 17:34:54 +0100 Lines: 48 Message-ID: References: <20080220035752.GR99258@elvis.mu.org> <4594886.5961203490569242.JavaMail.root@ly.sdf.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig46158382CB1A284B25B1008B" X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: lara.cc.fer.hr User-Agent: Thunderbird 2.0.0.6 (X11/20071022) In-Reply-To: <4594886.5961203490569242.JavaMail.root@ly.sdf.com> X-Enigmail-Version: 0.95.0 Sender: news Subject: Re: Dual Core Xeon / i386 install w/ more than 4gb of RAM X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Feb 2008 16:32:29 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig46158382CB1A284B25B1008B Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Tom Samplonius wrote: > Is PAE really that stable? I thought it was fairly unpolished, mainl= y because PAE is seen as a weak kludge implemented by Intel because they = all thought we would all be using Itanium's by now. Intel reversed their= folly pretty quickly, adopted the x86-64 extensions as-is from AMD, and = pushed them onto every piece of silicon they make. Architecturally, it's a nasty kludge. As far as stability on FreeBSD is concerned, my only machine under PAE with 4 GB RAM (without PAE it would use a bit over 3 GB) is very solid on 6-STABLE. > I also really don't know how anyone would properly use 16GB of RAM un= der PAE anyways? Each process is going to limited to just under 4GB. Th= e kernel memory space can't be bigger than 4GB either, so forget about a = huge disk cache. As I understand it, one possible benefit could be to use the memory for disk / file cache. AFAIK the pages are just pages, without distinction where they are mapped, and for example, if you run PostgreSQL, it couldn't use more than 4 GB for its own data (actually closer to 2 GB because of some sysvshm issues) but it will indirectly use the cache. > And is there some really stability fear about FreeBSD on x86-64? See= ms just the same as i386. I agree, FreeBSD on amd64 is very stable. --------------enig46158382CB1A284B25B1008B Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHvFauldnAQVacBcgRAnqVAKCvALurLcNegpBmsOf6kI5ZFfomsACbBLY6 70XfN7SP3Bm7s53lPVbeQvw= =VxSl -----END PGP SIGNATURE----- --------------enig46158382CB1A284B25B1008B--