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Gilles Mocellin 11-16-2007 08:26 PM

64 bits or 32 bits? How to define?
 
Le Thursday 15 November 2007 19:45:50 cs, vous avez écrit*:
> On Thu, 2007-11-15 at 11:05 +0000, michael wrote:
> > On Thu, 2007-11-15 at 00:56 +0100, Gilles Mocellin wrote:
> > > Le Wednesday 14 November 2007 21:57:20 Pantor, vous avez écrit :
> > > > Exactly yes, CPU is AMD Athlon XP-M 2800+ and no idea is it 64 bits
> > > > or 32 bits CPU.
> > >
> > > It is 64bits if you see lm (Large Mode) in :
> > > $ grep flags /proc/cpuinfo
> > > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall
> > > nx lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr
> > > lahf_lm flags : fpu vme de pse tsc msr pae mce cx8 apic sep
> > > mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
> > > syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16
> > > xtpr lahf_lm
> > >
> > > Here, it was a core 2 Duo (2 line because 2 cpu).
> > > There is lm.
> >
> > I don't think that's correct.
> >
> > Output from my 32 bit Xeon:
> > michael@ratty:~$ grep flags /proc/cpuinfo
> > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm
> > constant_tsc pni monitor ds_cpl cid cx16 xtpr
> > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm
> > constant_tsc pni monitor ds_cpl cid cx16 xtpr
> >
> > has 'lm'
> >
> > So I'm unsure what's happening here!
>
> actually I've just been corrected - it seems from `dmesg` that II've a
> Xeon with sSpec=SL7PE which appears to have EM64T so I guess it does
> support 64 bit computing.
>
> although I've always thought it was 32 bit and everything on it seems to
> be!
>
> cheers, Michael

Trust me, LM = Large Mode = 64 bit.

Of course, EM64T Intel's and AMD64 AMD's can handle 32bits apps natively !

Now, if you want you can upgrade to a 64bit system, especially if you have
more than 2Go RAM.


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