From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by nuthatch.gentoo.org with esmtp (Exim 4.67) (envelope-from <gentoo-user+bounces-67187-garchives=archives.gentoo.org@gentoo.org>) id 1IEwCJ-0002pq-Pz for garchives@archives.gentoo.org; Sat, 28 Jul 2007 23:59:48 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.14.0/8.14.0) with SMTP id l6SNveKk018579; Sat, 28 Jul 2007 23:57:40 GMT Received: from vscan02.westnet.com.au (vscan02.westnet.com.au [203.10.1.132]) by robin.gentoo.org (8.14.0/8.14.0) with ESMTP id l6SNqnCs013164 for <gentoo-user@lists.gentoo.org>; Sat, 28 Jul 2007 23:52:50 GMT Received: from localhost (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with ESMTP id 21EBD11DA83 for <gentoo-user@lists.gentoo.org>; Sun, 29 Jul 2007 07:53:18 +0800 (WST) Received: from vscan02.westnet.com.au ([127.0.0.1]) by localhost (vscan02.westnet.com.au [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 12324-02 for <gentoo-user@lists.gentoo.org>; Sun, 29 Jul 2007 07:53:18 +0800 (WST) Received: from [192.168.1.55] (unknown [124.149.73.150]) by vscan02.westnet.com.au (Postfix) with ESMTP id A320811DA82 for <gentoo-user@lists.gentoo.org>; Sun, 29 Jul 2007 07:53:17 +0800 (WST) Subject: Re: [gentoo-user] Linux too damn slow if memory > 3GB From: Tim Allingham <deserted@westnet.com.au> To: gentoo-user@lists.gentoo.org In-Reply-To: <1185665991.14058.2.camel@localhost> References: <8a0c7af10707281628p61dac9f1x89aef31a6f2b71df@mail.gmail.com> <1185665991.14058.2.camel@localhost> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-8DXtpA+hY6Vw8zZKu/gd" Date: Sun, 29 Jul 2007 09:52:07 +1000 Message-Id: <1185666727.14058.4.camel@localhost> Precedence: bulk List-Post: <mailto:gentoo-user@lists.gentoo.org> List-Help: <mailto:gentoo-user+help@gentoo.org> List-Unsubscribe: <mailto:gentoo-user+unsubscribe@gentoo.org> List-Subscribe: <mailto:gentoo-user+subscribe@gentoo.org> List-Id: Gentoo Linux mail <gentoo-user.gentoo.org> X-BeenThere: gentoo-user@gentoo.org Reply-to: gentoo-user@lists.gentoo.org Mime-Version: 1.0 X-Mailer: Evolution 2.10.2 X-Archives-Salt: 54cf319e-6e1b-451b-8468-aefd001f5164 X-Archives-Hash: 0e9ce7231c3f4fd81def1ebb9ad13b16 --=-8DXtpA+hY6Vw8zZKu/gd Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Sun, 2007-07-29 at 09:39 +1000, Tim Allingham wrote: > On Sat, 2007-07-28 at 20:28 -0300, Daniel van Ham Colchete wrote: > > Hello everyone!!! > >=20 > > May be somebody can shed some light here... I'm building a server here > > with 4GB of RAM memory. The fact is, if I boot with mem=3D3072M > > everything goes as fast as it should but I'm not using 1GB of memory. > > If I don't put the mem option, Linux will see 4GB of memory available > > but it will be damn slow (really).=20 > >=20 > > To make Linux recognize 4 gigs of memory I had to activate > > HIGHMEM=3D64GB, otherwise it only recognizes 3279MB (but it is fast). > >=20 > > My processor is a Intel Core 2 Duo E6320 (1.86Ghz). The motherboard is > > Intel. I'm running Gentoo at 32bits mode and the kernel version is > > 2.6.20-gentoo-r8. > >=20 > > Any lights would be very appreciated. > >=20 > > Best regards, > > Daniel Colchete >=20 > I don't actually run 4GB of RAM in any of my intel systems, so I can't > comment from experience, however my suspicion would be the overhead > introduced from PAE, which (at least on older kernels) requires some > processing overhead to utilise. Are you able to try a 64-bit install to > determine if this is the case? >=20 > Regards, >=20 > Tim Allingham > Email:Tim@DataFirst-IT.com.au just to add, this page gives a reasonable explanation of the problems with 32-bit OS's trying to address large RAM volumes http://www.dansdata.com/askdan00015.htm --=-8DXtpA+hY6Vw8zZKu/gd Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.5 (GNU/Linux) iD8DBQBGq9amzDi2M4U3QqIRArwcAJ9brzdIYjJABfCNLC3X3gDECya6kgCcDKHV iEKv75N62o027nKv7PoIvx4= =iu+9 -----END PGP SIGNATURE----- --=-8DXtpA+hY6Vw8zZKu/gd-- -- gentoo-user@gentoo.org mailing list