[gentoo-user] 4 GB and Intel Core 2 Duo

[gentoo-user] 4 GB and Intel Core 2 Duo

[Pawel K]

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Hello

I have 4 GB of ram and a Intel Core 2 Duo E4500.
I compiled the kernel as follows:
Processor family
  Core 2/newer Xeon

Subarchitecture Type
  PC-compatible

High Memory Support
  Off

All my remaining packages are compiled as 32 bit binaries.

The last switch causes my system to see less than 1 GB of memory:
cat /proc/meminfo:
MemTotal:       901816 kB

AFAIK kernel does not need High Memory Support in case of 64 bit CPUs.

What's wrong with my kernel config ?
Maybe it does not run as a 64 bit CPU ?

thanks for an answer.



      

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Re: [gentoo-user] 4 GB and Intel Core 2 Duo

[Dale]

Pawel K wrote:
> Hello
>
> I have 4 GB of ram and a Intel Core 2 Duo E4500.
> I compiled the kernel as follows:
> Processor family
>   Core 2/newer Xeon
>
> Subarchitecture Type
>   PC-compatible
>
> High Memory Support
>   Off
>
> All my remaining packages are compiled as 32 bit binaries.
>
> The last switch causes my system to see less than 1 GB of memory:
> cat /proc/meminfo:
> MemTotal:       901816 kB
>
> AFAIK kernel does not need High Memory Support in case of 64 bit CPUs.
>
> What's wrong with my kernel config ?
> Maybe it does not run as a 64 bit CPU ?
>
> thanks for an answer.
>
>

Check your kernel:

Processor type and features

High Memory Support

then select 4Gb or maybe even 64Gb if you plan to add even more later.

Hope that helps.

Dale

:-)  :-) 
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Re: [gentoo-user] 4 GB and Intel Core 2 Duo

[Neil Bothwick]

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On Thu, 3 Jul 2008 08:49:45 -0700 (PDT), Pawel K wrote:

> AFAIK kernel does not need High Memory Support in case of 64 bit CPUs.
> 
> What's wrong with my kernel config ?
> Maybe it does not run as a 64 bit CPU ?

That's the most likely case, because the HighMem option doesn't even
appear on a 64 bit system.


-- 
Neil Bothwick

For every action, there is an equal and opposite malfunction.

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Re: [gentoo-user] 4 GB and Intel Core 2 Duo

[Mike Williams]

On Thursday 03 July 2008 16:49:45 Pawel K wrote:
> AFAIK kernel does not need High Memory Support in case of 64 bit CPUs.

Correct.

> What's wrong with my kernel config ?
> Maybe it does not run as a 64 bit CPU ?

The config for an x86_64 kernel doesn't have a high memory support option, 
you've built a 32bit kernel.


a64bitserver linux # make menuconfig
scripts/kconfig/mconf arch/x86_64/Kconfig
make[1]: *** [menuconfig] Error 1
make: *** [menuconfig] Interrupt


-- 
Mike Williams
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Re: [gentoo-user] 4 GB and Intel Core 2 Duo

[Norberto Bensa]

Quoting Pawel K <pawlaczus@yahoo.com>:

> High Memory Support
>   Off

You made you box to only see ~950MB :)

 From menuconfig:



CONFIG_HIGHMEM4G:

Select this if you have a 32-bit processor and between 1 and 4
gigabytes of physical RAM.

Symbol: HIGHMEM4G [=y]
Prompt: 4GB
   Defined at arch/x86/Kconfig:766
   Depends on: <choice> && !X86_NUMAQ
   Location:
     -> Processor type and features
       -> High Memory Support (<choice> [=y])


Regards,
Norberto

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Re: [gentoo-user] 4 GB and Intel Core 2 Duo

[Volker Armin Hemmann]

On Donnerstag, 3. Juli 2008, Pawel K wrote:
> Hello
>
> I have 4 GB of ram and a Intel Core 2 Duo E4500.
> I compiled the kernel as follows:
> Processor family
>   Core 2/newer Xeon
>
> Subarchitecture Type
>   PC-compatible
>
> High Memory Support
>   Off
>
> All my remaining packages are compiled as 32 bit binaries.

you installed a 32bit kernel?

>
> The last switch causes my system to see less than 1 GB of memory:
> cat /proc/meminfo:
> MemTotal:       901816 kB
>
> AFAIK kernel does not need High Memory Support in case of 64 bit CPUs.
>
> What's wrong with my kernel config ?
> Maybe it does not run as a 64 bit CPU ?

it does. But it needs a 64bit kernel. And to have one you need a 64bit gcc and 
binutils and glibc and ....

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Re: [gentoo-user] 4 GB and Intel Core 2 Duo

[Norberto Bensa]

Neil Bothwick wrote:

> That's the most likely case, because the HighMem option doesn't even
> appear on a 64 bit system.

He runs on 32
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Re: [gentoo-user] 4 GB and Intel Core 2 Duo

[Florian Philipp]

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On Thu, 3 Jul 2008 08:49:45 -0700 (PDT)
Pawel K <pawlaczus@yahoo.com> wrote:

> Hello
> 
> I have 4 GB of ram and a Intel Core 2 Duo E4500.
> I compiled the kernel as follows:
> Processor family
>   Core 2/newer Xeon
> 
> Subarchitecture Type
>   PC-compatible
> 
> High Memory Support
>   Off
> 
> All my remaining packages are compiled as 32 bit binaries.
> 
> The last switch causes my system to see less than 1 GB of memory:
> cat /proc/meminfo:
> MemTotal:       901816 kB
> 
> AFAIK kernel does not need High Memory Support in case of 64 bit CPUs.
> 
> What's wrong with my kernel config ?
> Maybe it does not run as a 64 bit CPU ?
> 
> thanks for an answer.
> 
> 
> 
>       
If you want to keep your 32bit userland, you'll run into a chicken-or-
the-egg-problem (because you can't run 64bit software without a 64bit
kernel).

To avoid this, you could get a precompiled 64bit kernel and
boot with that one. Then you can use an AMD64-stage3 from Gentoo to
compile your own kernel.

I think, that's the easiest solution but I haven't tested it.

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