On 07/04/2013 02:47 PM, Sebastian Kuzminsky wrote:
>
>
> Gene Heskett <[email protected]> wrote:
>
>> Greetings; I just put 8Gb of dram in this machine, and the bios
>> recognized it just fine.
>>
>> But the 32 bit SMP/PAE kernel in the LinuxCNC tree only sees 4 Gb.
>>
>> This kernel:
>>
>> 2.6.32-122-rtai #rtai SMP Tue Jul 27 12:44:07 CDT 2010 i686
>> GNU/Linux Humm, maybe its not a PAE kernel. :(
>>
>> Is this fixable w/o going to a 64 bit install?
>
> To use more than 4 gigs of ram you need either a 64-bit kernel or a
> 32-bit kernel with pae.
>
> Neither is likely to be developed for LinuxCNC 2.5 on Ubuntu 10.04
> Lucid. The RTOS work that Michael and Zultron are doing should get
> us a 64-bit kernel for Lucid and Precise for 2.6.
>
The Xenomai folks say that PAE adds a lot of overhead to memory access,
and they recommend avoiding PAE kernels for RT. For that reason, I'd
stick with the non-PAE kernel until something 64-bit becomes suitable
for your purposes.
John
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