Mailinglist Archive: opensuse (4634 mails)

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Re: [opensuse] unable to access website after 10.2 install [CLUE!]
  • From: Randall R Schulz <rschulz@xxxxxxxxx>
  • Date: Tue, 19 Dec 2006 15:08:20 -0800
  • Message-id: <200612191508.20434.rschulz@xxxxxxxxx>
On Tuesday 19 December 2006 14:48, John Andersen wrote:
> On Tuesday 19 December 2006 13:31, Randall R Schulz wrote:
> > John,
> >
> > On Tuesday 19 December 2006 14:09, John Andersen wrote:
> > > On Tuesday 19 December 2006 08:11, Randall R Schulz wrote:
> > > > ASUS P5B Deluxe
> > > > Core 2 Duo
> > > > 32-bit Linux install
> > >
> > > How did That happen? Core 2 is x86_64 by default...
> >
> > Says who? What "default?"
> Well, Randall, since your past responses suggest you
> are a big wikipedia fan, check here:

Wikipedia is a good thing, yes.

> Its a 65bit processor. It will emulate 32bit.


The question was not about what it can do, but what it's "default" is.

> You incur some penalty in installation size (disk space)
> but since the bulk of an os is moving stuff around in memory
> you will gain the use of 64bit registers to do this if you install
> the 64bit kernel.

Think more about this. The primary bottleneck in modern desktop-style
computers is the memory interface. The limiting factor there derives
from the cycle time of the RAM and the width of the transfer bus. Using
a 64 bit processor does not change those parameters. However, it does
mean that all addresses and single-word values are 64-bits wide, and
transferring that any number of such 64 bit quantities is going to take
twice as long as transferring the same number of 32-bit quantities. If
all you're doing is a lot of string copies, you won't find much
difference. But if you're doing integer arithmetic in programs written
in C or C++ and those programs are compiled for the 64-bit ISA, then
you're going to be moving a whole lot of high-order zero bits around.

If you don't need a 64-bit architecture, you definitely should not use
one. I don't need one.

Randall Schulz

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