Which would be great for server apps but not very charming for doing large simulations or database work. BTW, i wonder if the problem of relocating real 32 bit adresser under a > 32 bit plataform (as requiered to talk with 32 bit pci devices taht do bus mastering) would be much of a problem. I wonder if the people that has worked on NetBSD/Alpha has got a look into it. Perhaps the "bounce buffers" from the ISA days might come back (as ther are still very few 64 bit PCI cards)
Regards... ROBERTO
BTW, Have wou NETBSDers discusser if it would be worthwile to implement a PSE36 port... I remember Alan Cox sayng it was a no-no
On a 32 bit plataform, it is doubtfull if it makes any sense to have more than 4 GB, as this forces the os and apps that mght want to use it to do some segment translation (remember that the P6 architecure implememnts a 36 bit adressing mode)
I don't know if any modern OS supports them, however.
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Agreed ...
...
...
Which would be great for server apps but not
very charming for doing large simulations or
database work. BTW, i wonder if the problem
of relocating real 32 bit adresser under a
> 32 bit plataform (as requiered to talk
with 32 bit pci devices taht do bus mastering)
would be much of a problem. I wonder if
the people that has worked on NetBSD/Alpha
has got a look into it. Perhaps the "bounce buffers" from the ISA days might come back
(as ther are still very few 64 bit PCI cards)
Regards
ROBERTO
BTW, Have wou NETBSDers discusser if it would be
worthwile to implement a PSE36 port
I remember Alan Cox sayng it was a no-no
There are several factors that determine the
maximum ammount or RAM that can be plugged
into a given MB
1. PCIset
Modern desktop chipsets are not built for
memory hungry applications. The phisical limit
is
-82440 LX: 512 MB SDRAM or 1 GB EDO
-82440 BX: 1 GB SDRAM
-82440 GX: 2 GB SDRAM (Using registered modules)
And for the server Chipsets
-82450 GX: 4 GB FPM
-82450 NX: 8 GB EDO
On a 32 bit plataform, it is doubtfull if it
makes any sense to have more than 4 GB, as this
forces the os and apps that mght want to use
it to do some segment translation (remember that
the P6 architecure implememnts a 36 bit adressing
mode)
I don't know if any modern OS supports them, however.
Regards
Roberto