[CentOS] Silly question x64 vs i386

Scot P. Floess sfloess at nc.rr.com
Wed Dec 16 20:05:35 UTC 2009

so to be honest...what really spawned this...  I put all my VMs on an NFS 
share.  I've got an F11 VM I run...but on my x86_64 host - starting the 
F11 VM (its an i386 VM) fails to start.  If I run F11 x86_64 it works 
fine.  I' really just trying to simplify things and standards on one type 
of VM ;)  Yes, I don't have any issues with CentOS guest VMs being i386 
and running on the x86_64 host - works fine...

On Wed, 16 Dec 2009, nate wrote:

> Scot P. Floess wrote:
>> I have a really silly question... but just want to ask...
>> I have one box on my home network that is x86_64 capable...  My other
>> boxes are all i386.  As this x86_64 machine can, at most, house 4 GB of
>> RAM (currently only has 1 GB) - is there any advantage to my running
>> x86_64 on that machine instead of i386...  Long story as to why I am
>> asking - but before I go off and moveit down to i386 - just wanted some
>> opinions :)
> Really depends on what you are going to use it for, my own home system
> is 3GB and runs i386 mainly for software compatibility reasons, my
> co-located server runs i386 with 6GB ram mainly because VMware doesn't
> support 64-bit mode on the older Xeons I have, so not a big point for
> me to go 64-bit(and memory usage is quite low anyways).
> Myself I make it a point when dealing with VMs at least to make them
> 32-bit unless they need a lot of memory, then I make them 64-bit. On
> any modern host I have they are all 64-bit, and typically have
> a minimum of 16-32GB of ram, so one would have to go to the nuthouse
> to run 32-bit on 16+GB of ram these days..my own cut off point, line
> in the sand for 32-64bit is 8GB. But certainly there are cases that
> you want 64-bit for even a system running 3GB(such as running a
> DB or VM process that uses a lot of memory).
> I would say stick to whatever your using now if it works, if the
> rest of your network is i386 and that one box is i386, and you
> could move it to x86_64, I would leave it at i386 myself.
> nate
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Scot P. Floess
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