AMD64 I386 or X64 load?

[stan]

On Mon, Mar 27, 2006 at 12:01:22PM +1100, James Gray wrote:
> On Mon, 27 Mar 2006 11:10 am, stan wrote:
> > On Mon, Mar 27, 2006 at 10:35:11AM +1100, James Gray wrote:
> > > On Mon, 27 Mar 2006 10:18 am, stan wrote:
> > > > I just discovered that I grabbed the wrong set of CD's yesterday and
> > > > loaded the I386 set on my dual processor, dual core Opteron machine
> > > > (Sun Ultra 40).
> > > >
> > > > I then downloaded the latest 2.16 kernel and built a custom kernel for
> > > > this machine, setting the processor type correctly in the kernel
> > > > config.
> > > >
> > > > How much performance penalty should I expect, if I don't reload the
> > > > correct binaries?
> > >
> > > Pretty significant considering an AMD64 kernel wont grok 32bit libs. 
> > > IOW, it probably wont boot.  Install the 64bit kernel and libs and you'll
> > > be all set.
> >
> > Mmm, something's not quite right here.
> >
> > I _mistakenly_ loaded from the I386 CD's, and before I noticed it, I
> > downloaded the 2.16 kernel sources, and built a kerne specifying the
> > correct procesor. Hmm, maybe it's a 32 bit kernel now that I think about
> > it.
> >
> > How can I tell?
> 
> Compile this:
> 
> ---- bit-check.cpp ----
> 
> #include <iostream>
> 
> int main(void){
>         std::cout << "Looks like this is a "
>                   << sizeof(int)*8 << "bit system" << std::endl;
>         return 0;
> }
> 
> ---- bit-check.cpp ----
> 
> (ie, "g++ bit-check.cpp -o bit-check")
> then run "./bit-check".
> 
> 64bit kernels use 64bit integers, and 32bit kernels use 32bit integers.  
> Assumption is that there are 8bits/byte which isn't necessarily correct on 
> all architectures, but should work on AMD64/IA32.
> 

Thanks,
Looks like it's 32 bit.


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