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To: Tenchusatsu who wrote (60491)	10/26/2001 2:20:33 PM
From: dale_laroy	Read Replies (1) \| Respond to of 275872

>Dale, then what is the point of addressing 64 bits in the OS if it is already able to address 36 bits? The highest-end AMD platform can't even support more than 4 GB of DRAM, and it will take them quite a while before they even hit the 36-bit limit of 64 GB.< You are of course right for the specific example of applications that only address 32-bits. But, the ability of Hammer to do the same thing with applications that are designed to utilize up to 36-bits of address space could encourage the development of more 36-bit applications. As for x86 systems not having more than 4GB of physical memory, this is largely irrelevant. Hammer can utilize a 48-bit virtual address space in 4GB or less of physical address space. Especially when doing database queries using "in memory" files, it is unlikely that all the virtual addresses will ever have to be physically in memory.

To: Tenchusatsu who wrote (60491)	10/26/2001 8:51:01 PM
From: Joe NYC	Read Replies (1) \| Respond to of 275872

Tenchusatsu, I'm sure the 64 GB limit will be breached eventually, but then we're talking beyond K9. 64 GB (36 bit virtual addressing) is what Xeon (P6 core based) supports. Athlon has a similar virtual addressing scheme with different number of bits (I can't recall the number). Looking at slide 6 of the Hammer presentation, Hammer supports full 64 bit address space internally, and the external interface supports 40bit physical address space and 48 bit virtual address space, so the physical address space limit is 1 TB, not 64GB. As far as OS support, I think realistically, we will have to wait for the next major version of Windows, 6.0. BTW, has the real version of Windows 2000 / 64 been released, or is it still a pilot? Joe