Re: AMD Athlon64 X2 Dual-core and 4GB

[Vladimir Lazarenko <vlad@lazarenko.net>]

> > > If you want to use 4GB in 32 bit mode, you *need* remapping (or you lose
> > > part of your memory).  Remapping means you have MORE than 4 GB of physical
> > > address, which means you need PAE to use it at all.
> >
> > Yes, and PAE works fine with a 32bit kernel.  I agree it is a silly
> > configuration and a 64bit kernel would use the memory more
> > efficiently.  My basic point was that a dual-core is a recent enough
> > processor from AMD that it supports memory remapping.  So with a
> > correct BIOS there should be no problems. 
>
>
> Earlier Opterons had remapping, too, just at the chip-select level.  Even
> with remapping, the memory that gets remapped gets mapped above 4 GB, so a
> 32 bit kernel still needs PAE to address it.

Well, my BIOS had 2 types of re-mapping, H/W and S/W, i enabled H/W 
remapping, compiled kernel with 64G HIGHMEM, and voila:

vlad@anarxi:~$ free
             total       used       free     shared    buffers     cached
Mem:       4151876    2972968    1178908          0     179008     679016
-/+ buffers/cache:    2114944    2036932


Thanks everyone!

Vladimir

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