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Re: Promoting i386 version over x86_64?



On 12/08/2009 06:41 PM, drago01 wrote:
On Tue, Dec 8, 2009 at 5:27 PM, Rallias UberNerd
<robinstar1574 gmail com>  wrote:
On Thu, 19 Nov 2009 17:39:16 -0600, Kevin Kofler<kevin kofler chello at>
wrote:

Bill McGonigle wrote:

"Are you installing Fedora on the computer you're using now?" [YES]  [NO]
  YES ->  is any sort of check even possible if the user is running
32-bit on 64-bit?

Yes, if the CPU has the lm (long mode) flag, it's a 64-bit-capable CPU and
using the 32-bit version is suboptimal.

        Kevin Kofler

But wouldn't it be better to use 32 bit when less then 4 GB of ram is
present?

no, using x86_64 means more registers, sse2 as default floating point
instruction set, better calling convention (register passing vs.
stack) or in other words in most cases faster code.

That's one side, the other side is:
* Larger demands on RAM (x86_64 is more demanding on memory
  requirements).
* More packages (rpms) to cope with.
* The "faster" is hardly sensible to ordinary users.

Ralf


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