Re: New itaniums out at 2.5x perform gain

Bill Todd wrote:
Neil Rieck wrote:
Despite what Intel + AMD marketing folks would have us believe, these product lines you are referring to are not 64-bit. It may seem so, to some, because CPU and "memory management" functions have been integrated (read blurred) but these CPUs are only 32 bits wide.

To understand this better, think about the PDP-11 system which was a 16 bit CPU. The memory management system allowed the CPU to address memory using 18-bit, 22-bit, and 24-bit access. This worked by having the CPU first initialize MMU registers which were later combined (added) with 16-bit addresses coming from the CPU to generate a wider address going to memory....

... The most charitable explanation I can come up with is that you're confusing the 32-bit 'programmable address extension' (PAE) mechanisms...

To simplify what I think Bill is saying here is that IA-32 and some of its more unusual modes has some really funky address segmentation requirements, but that IA-32e is a flat 64-bit address space.

Yes, IA-32e is 64-bit from what I can see of it, and it also seems to eliminate a few of what I might consider to be the more musty parts of IA-32.

Current IA-32e physical address space isn't as large as that of IA-64, and there are various other processor differences. But IA-32e does provide what I would consider to be a flat 64-bit address space, and 64-bit registers, and yes, four modes (rings).

And no, there are no plans to port OpenVMS to IA-32e.







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