Re: [gentoo-user] Which arch do I have ?

[Benjamen R. Meyer]

Wael Nasreddine wrote:
> On Mon, Feb 11, 2008 at 10:31:30PM -0500, "Benjamen R. Meyer" <bm_witness@×××××.com> wrote:
>
>> As you have an Intel Core Duo, you should have the EMT64E version -
>> Intel's version of the AMD64 instruction set - thus x86-64 compatible.
>
>> Best place to check is Intel's website - here's what I found:
>
>> http://processorfinder.intel.com/details.aspx?sspec=sl9dv
>> http://developer.intel.com/design/mobile/core/duodocumentation.htm
>
>> With EMT64E, you will be able to compile for 64-bit mode using the
>> x86-64 builds. (You can only use Intel64 if you have the Itanium procs
>> if memory serves.)
>
>> However, unless you specifically install the x86-64/AMD64/64-bit
>> version, you will have a 32-bit x86 environment and kernel. You can
>> upgrade if you like...see other threads for that info.
>
>> HTH,
>
>> Ben
>
> Let's say this processor supports 64 bits, what whould I gain from
> migrating to x86_64 I mean would it be faster??? I've never
> owned/worked on a 64bit machine before so excuse my lack of knowledge
> :)

The primary advantage is larger memory space, and more native use of the
entire processor. I'm running it b/c I want to be - not b/c I need the
memory space, I'm not pushing 4GB for Physical RAM which is primarily
what it is about.

From my understanding, you won't gain much if any in speed. The
processor is still the same clock rate. 64-bit programs may (not sure,
someone verify?) be bigger as the opcodes are larger.

You can run any of the following configs:
1) pure 32-bit
2) pure 64-bit
3) mixed 32-64 bit (multi-lib)

#3 will be the largest install as you have a lot of duplications since
you are hosting both a 32-bit and 64-bit environment. However, with #2
you might not get a lot of programs since there are quite a few that
have not been fully ported to 64-bit modes. You're running #1 now.

So not much is gained for now.

Ben

>> Wael Nasreddine wrote:
>>> Hello,
>
>>> It's been like 6 months I'm using the arch i686, but today I saw on this
>>> page[1] something that confused me, saying that I have an x86_64 arch I have a
>>> Toshiba A135-S4427 with Intel dual core 1.73Ghz here's the output of
>>> /proc/cpuinfo
>
>>> ---- CUT
>>> processor       : 0
>>> vendor_id       : GenuineIntel
>>> cpu family      : 6
>>> model           : 14
>>> model name      : Genuine Intel(R) CPU           T2250  @ 1.73GHz
>>> stepping        : 8
>>> cpu MHz         : 800.000
>>> cache size      : 2048 KB
>>> physical id     : 0
>>> siblings        : 2
>>> core id         : 0
>>> cpu cores       : 2
>>> fdiv_bug        : no
>>> hlt_bug         : no
>>> f00f_bug        : no
>>> coma_bug        : no
>>> fpu             : yes
>>> fpu_exception   : yes
>>> cpuid level     : 10
>>> wp              : yes
>>> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc arch_perfmon bts pni monitor est tm2 xtpr
>>> bogomips        : 3460.63
>>> clflush size    : 64
>
>>> processor       : 1
>>> vendor_id       : GenuineIntel
>>> cpu family      : 6
>>> model           : 14
>>> model name      : Genuine Intel(R) CPU           T2250  @ 1.73GHz
>>> stepping        : 8
>>> cpu MHz         : 800.000
>>> cache size      : 2048 KB
>>> physical id     : 0
>>> siblings        : 2
>>> core id         : 1
>>> cpu cores       : 2
>>> fdiv_bug        : no
>>> hlt_bug         : no
>>> f00f_bug        : no
>>> coma_bug        : no
>>> fpu             : yes
>>> fpu_exception   : yes
>>> cpuid level     : 10
>>> wp              : yes
>>> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc arch_perfmon bts pni monitor est tm2 xtpr
>>> bogomips        : 3457.55
>>> clflush size    : 64
>>> ---- CUT
>
>>> So which arch do I really have??
>
>>> [1]: http://docs.fedoraproject.org/install-guide/f8/en_US/sn-which-arch.html
>


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