Re: FC6 kernels & 4GB of memory

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Darryl wrote:
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 :-/


The M2V BIOS was just updated to 1802 but it didn't make a difference for kernel 2.6.21-3228.fc7PAE which would panic on boot with a

mount: could not find filesystem '/dev/root'

message. Adding 'mem=4096m' to the command line would allow the system to boot but free would show '3375576 total' which is some 700MB shy.


New kernel 2.6.22.1-27.fc7PAE now boots without command line options and:
free
           total       used       free     shared    buffers     cached
Mem:     4149648    3964376     185272          0     174440    3586788
-/+ buffers/cache:   203148    3946500
Swap:            0          0          0

is showing what I had hoped for originally :-) /proc/mtrr shows the same as it did before:

# 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

is that correct?

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