Date: Mon, 18 Jun 2007 17:15:30 -0400 From: "Martin Turgeon" <turgeon.martin@gmail.com> To: "Jeremy Chadwick" <koitsu@freebsd.org> Cc: freebsd-hackers@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: i386 with PAE or AMD64 on PowerEdge with 4G RAM Message-ID: <322073cc0706181415o17ecd532i971d8bdf5ea1dafd@mail.gmail.com> In-Reply-To: <20070618180813.GA13003@eos.sc1.parodius.com> References: <4676BAF0.4030703@gmail.com> <20070618180813.GA13003@eos.sc1.parodius.com>
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2007/6/18, Jeremy Chadwick <koitsu@freebsd.org>: > > On Mon, Jun 18, 2007 at 01:03:44PM -0400, Martin Turgeon wrote: > > I just receive 2 PowerEdge servers (a 1950 and a 860) both with 4G of > RAM. I > > installed FreeBSD 6.2 Release i386 on both of them. Unfortunately, only > 3,5G > > is recognized on the 860 and 3,3G on the 1950. > > dmesg on 860: > > real memory = 3757834240 (3583 MB) > > avail memory = 3678318592 (3507 MB) > > > > I am facing a difficult decision. Should I use i386 with PAE enabled in > the > > kernel (I read a lot of warnings using it) or should I go with AMD64? > Which > > branch should I follow? > > Based on what I've read from some of the porters and miscellaneous > others, generally-speaking there's too many issues with amd64 (in the > sense of 32-bit vs. 64-bit compatibility -- not the fault of the kernel > or otherwise) to consider it worth switching to. > > I personally don't run 64-bit OSes because most developers still use > 32-bit machines and don't have a way to develop/test in 64-bit > environments. > > That said, I'd recommend you stick with i386 + PAE, simply for > guaranteed application compatibility. My setup is fairly standard (as I described), should I expect problem with 64 bit version of these programs? You'll lose the amount of RAM you're seeing due to PAE addressing for > PCI address space. I can dig you up a usage map (broken down by how > much is taken up by each portion; PCI, ACPI, etc.) if you want one. > It's for SuperMicro systems, but the general idea applies to most > everything. I'm not sure to understand what you mean by that. Are you saying that PAE will eat the 500M that should be available? -- > | Jeremy Chadwick jdc at parodius.com | > | Parodius Networking http://www.parodius.com/ | > | UNIX Systems Administrator Mountain View, CA, USA | > | Making life hard for others since 1977. PGP: 4BD6C0CB | > >
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