FC6 kernels & 4GB of memory

[Darryl]

Quoting "Wolfgang S. Rupprecht"
 >To see your memory layout check /proc/mtrr.

Ok, this is from 32bit PAE kernel:
$ cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1
reg03: base=0xd0000000 (3328MB), size= 128MB: write-combining, count=1

 >  reset to factory "optimized" settings.
Did that after the last BIOS update.

 >  select mtrr discontinuous		  (was contigious)
That option disappeared with a BIOS update actually. a new one popped up 
regarding Virtual stuff though.

 >  select mtrr hardware mapping		  (was disabled)
 >  select iommu 128k		          (was disabled)
BIOS doesn't have those options.

I tried downloading the latest/greatest 2.6.21 kernel and compiling my 
own 32bit "PAE" & "regular" kernels but they did the same thing. 
"regular" sees all the memory but tells me to use a PAE kernel and "PAE" 
  won't use all the memory and crashes on boot without mem=4095m. A 
little frustrating since the "regular" kernel and memtest86 see all the 
memory. The good news is that the on-board NIC is natively supported in 
.21 though :-/