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Old 12-21-2009, 10:24 PM
Gustin Johnson
 
Default Howto build kernel 2.6.31.6-rt19 and customize it's configuration

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Ralf Mardorf wrote:
> Hi
>
> there's no PAE for my 64-bit configuration , but anyway you should be

That is because the 64bit kernels do not need this extension. What it
does is allow 32bit machines to use more than 4 GiB of memory. It is
also required to make use of the "No Execute" or NX flag which is a
security feature of modern CPUs (which is why it is enabled by default
since there should be so few CPUs that do not support this).

Most CPUs since (and including) the Pentium Pro support this feature so
it is rare to see in the wild. I am pretty sure the Intel Atoms have
support for this extension (though the 330 series are 64bit capable) but
the early netbooks with those weird under-clocked Pentium-Ms did not
have PAE.

> able to disable PAE by using menuconfig and then search for PAE, resp.
> you can use gedit and do the same as described for XEN. It's described
> later in this howto.

It is in the "processor type and features" sub-menu.

<snip>
> Maybe I didn't search long enough, but I didn't found PAE. If you
> should find PAE, disable it and ...
> ... enter: Save an Alternate Configuration File
> Save : .config
> < Exit >
>
It won't be in your .config for your 64bit kernel. It is only enabled
when you select certain CPUs. If you use "make xconfig" and then search
for PAE, you will find it disabled and not selectable until you choose a
different CPU.

<snip>
> Using an AMD Athlon 2.1 GHz dual core processor it nearly takes 90
> minutes to compile the kernel. Dunno if there's a job option for
> make-kpkg, if there should be one, you can start more than one job, thus
> the compiling will go faster.
>
Before you actually compile, set the following variable:
MAKEFLAGS="CONCURRENCY-LEVEL=2"

This will better utilize your dual core machine. If you have 4 or 8
cores, then set this number to reflect the number of cores. On my dual
core Intel (T9550 @ 2.66GHz) this takes less than 40 minutes.

<snip>

Hth,
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Old 12-21-2009, 10:35 PM
Ralf Mardorf
 
Default Howto build kernel 2.6.31.6-rt19 and customize it's configuration

Gustin Johnson wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Ralf Mardorf wrote:
>
>> Hi
>>
>> there's no PAE for my 64-bit configuration , but anyway you should be
>>
>
> That is because the 64bit kernels do not need this extension.

That's why I added the "".

>> Using an AMD Athlon 2.1 GHz dual core processor it nearly takes 90
>> minutes to compile the kernel. Dunno if there's a job option for
>> make-kpkg, if there should be one, you can start more than one job, thus
>> the compiling will go faster.
>>

> Before you actually compile, set the following variable:
> MAKEFLAGS="CONCURRENCY-LEVEL=2"
>
> This will better utilize your dual core machine. If you have 4 or 8
> cores, then set this number to reflect the number of cores. On my dual
> core Intel (T9550 @ 2.66GHz) this takes less than 40 minutes.
>

Thank you, I didn't know this . Btw. I've got 1 GB + 896 MB RAM, more
RAM should increase the speed too .

Is there a way for Martin to start more than one job?
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