IA64 memory (zx1 mio)

IA64 memory (zx1 mio)

[Vaibhav Sharma]

hello all,
Thanks for all the responses.

Actually, I had downloaded a zx1 mio pdf, and my task involved just to
recognize whether there are any scalability limits at any place....
If my question was wrong...plz spare me...!

I think i had wrongly interpreted the "System Address Map" figure, on
page 12 of the pdf, (site:
http://ftp.parisc-linux.org/docs/chips/zx1-mio.pdf ). It shows the
"zones", memory0, memory1 and memory2, with corresponding addresses.
It says that m0+m1+m2=1+3+252%6 GB, now if 257th GB of address is to
be mapped by zx1, in which memory zone (m0,m1,m2) will it be
mapped..?..if this is not the case, how will zx1 map this giga byte..?
Is it that the physical RAM beyond 256 GB is mapped as memory mapped
I/O..?
it would be great if i could get some more information about zx1 chip.
plz do respond..
TIA
--
vaibhav

Re: IA64 memory (zx1 mio)

[Matthew Wilcox]

On Mon, Mar 14, 2005 at 12:35:07PM +0530, Vaibhav Sharma wrote:
> Actually, I had downloaded a zx1 mio pdf, and my task involved just to
> recognize whether there are any scalability limits at any place....
> If my question was wrong...plz spare me...!
> 
> I think i had wrongly interpreted the "System Address Map" figure, on
> page 12 of the pdf, (site:
> http://ftp.parisc-linux.org/docs/chips/zx1-mio.pdf ). It shows the
> "zones", memory0, memory1 and memory2, with corresponding addresses.
> It says that m0+m1+m2=1+3+252%6 GB, now if 257th GB of address is to
> be mapped by zx1, in which memory zone (m0,m1,m2) will it be
> mapped..?..if this is not the case, how will zx1 map this giga byte..?

It doesn't.  The zx1 chipset supports "only" 256GB of memory max.
HP uses the sx1000 chipset for machines that support more than 256GB.
As was said earlier, this isn't a practical limitation yet; for the
4-socket space HP ships the rx4640 which supports 128GB (4GB x 32 slots)
and the rx5670 which supports 96GB (2GB x 48 slots).  The 8-socket and
up boxes (rx7620, rx8620 and Superdome) use the sx1000 chipset.

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