Date: Wed, 20 Feb 2008 17:34:54 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: Dual Core Xeon / i386 install w/ more than 4gb of RAM Message-ID: <fphkml$m2m$1@ger.gmane.org> In-Reply-To: <4594886.5961203490569242.JavaMail.root@ly.sdf.com> References: <20080220035752.GR99258@elvis.mu.org> <4594886.5961203490569242.JavaMail.root@ly.sdf.com>
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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--
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