x86_64 as Fedora's primary platform

drago01 drago01 at gmail.com
Tue Sep 28 18:57:30 UTC 2010


On Tue, Sep 28, 2010 at 8:49 PM, John Reiser <jreiser at bitwagon.com> wrote:
> On 09/28/2010 11:37 AM, drago01 wrote:
>> On Tue, Sep 28, 2010 at 8:09 PM, Mike McGrath <mmcgrath at redhat.com> wrote:
>
>>> We run 32 bit vms in Fedora Infrastructure a lot for purposes of memory
>>> density, we do it based on what will be running on the host as it doesn't
>>> always make sense to do so.  It's worked out very well for us.
>
>> That's a valid case where it indeed makes sense, but I assume the
>> *host* is running x86_64.
>
> 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).


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