x86_64 as Fedora's primary platform

John Reiser jreiser at bitwagon.com
Tue Sep 28 19:15:03 UTC 2010

On 09/28/2010 11:57 AM, drago01 wrote:
> On Tue, Sep 28, 2010 at 8:49 PM, John Reiser <jreiser at bitwagon.com> wrote:

>> A x86_64 kernel with everything else i686 [no 64-bit apps] can be good
>> non-virtually, too, particularly when it avoids 32-bit PAE for more than
>> 3.3GB of RAM.

> No it is pointless in 99% of the times, you lose stuff like:
> SSE2 being part of the standard ABI and additional registers for no
> real gain. (which can result into none or huge performance differences
> depending on the situation).

Being able to run 3000 simultaneous processes (32-bit) instead of only
2400 processes (64-bit) can be an advantage that out-weighs the minor
losses to each individual process.  RAM is cheap [and a capital cost],
racks are expensive [and an operating cost for power, cooling, rent.]


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