Re: -mmX 4G patches feedback [numbers: how much performance impact]

[Andrea Arcangeli]

On Tue, Apr 06, 2004 at 07:59:10PM +0200, Manfred Spraul wrote:
> Does AMD document how the CAM filter actually works? x86-64 writes into 
> the 4th level page table during a context switch and if I understand the 
> patent description correctly, this defeates the flush filter and forces 
> a full flush during a context switch.

this is something we discussed a few times during the early x86-64
development. The main question you should answer is what gains you to do
a partial flush if the only non global entries have to be flushed
anyways?
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