Messages in this thread | | | Subject | Re: Intel vs AMD x86-64 | From | Albert Cahalan <> | Date | 24 Feb 2004 10:11:22 -0500 |
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On Tue, 2004-02-24 at 11:44, Dave Jones wrote: > On Mon, Feb 23, 2004 at 09:42:05PM -0500, Albert Cahalan wrote: > > Setting up only one of the IO-MMUs would be neat. > > AGPv3 standard mandates that you MUST keep all GARTs coherent, > so this isn't possible. The amd64 GART driver goes to great > lengths to make sure it does update the northbridges on every > CPU whenever something changes.
Of course. That's the easy way; you won't need to worry about memory interleave or out-of-bounds prefetch if you keep everything coherent.
I'm just saying it would be neat, and potentially useful, to intentionally violate this. Of greatest interest would be the 2-way Opteron boards that only have RAM connected to the CPU closest to PCI. The sidecar CPU :-) could be ignored.
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