Date: Fri, 21 Dec 2007 16:45:57 -0800 From: Chuck Swiger <cswiger@mac.com> To: Jeffrey Goldberg <jeffrey@goldmark.org> Cc: User questions <freebsd-questions@freebsd.org> Subject: Re: which cputype for Althon 64 X2 Dual Core Message-ID: <E49D3360-3B97-4BF0-911F-EA4472BC71FF@mac.com> In-Reply-To: <7E89BDCD-AF34-48D6-A4BD-D324A8BC0C5C@goldmark.org> References: <7E89BDCD-AF34-48D6-A4BD-D324A8BC0C5C@goldmark.org>
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On Dec 21, 2007, at 4:33 PM, Jeffrey Goldberg wrote: > I'm building a new server with 7.0 BETA4 (it will track stable) with > the following CPU > > CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 5000+ (2600.02-MHz K8- > class CPU) [ ... ] > > What optimizations should I make in make.conf? A reasonable starting point is no special optimizations, and simply disable debug options like WITNESS, INVARIANTS, etc. If you plan to go beyond that, you'll need to start by doing some benchmarks before and after setting something like the CPU architecture that the compiler should tune for, and see whether you actually get any significant differences. > The example make.conf says > > AMD64 architecture: opteron, athlon64, nocona, prescott, core2 > > But I don't know whether althon64 or core2 would be the safest and > most appropriate. > > Also GENERIC for amd64 lists > > cpu HAMMER > > is that the best (only) choice? Yes, as far as AMD64 code goes. You could always switch down to running in 32-bit mode, though. -- -Chuck
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