Messages in this thread | | | Date | Tue, 06 Apr 2004 19:59:10 +0200 | From | Manfred Spraul <> | Subject | Re: -mmX 4G patches feedback [numbers: how much performance impact] |
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Arjan wrote:
>afaics all Intel and AMD cpus with more than say 32 or 64 TLB's are >actually 64 bit capable.... so obviously you run a 64 bit kernel there. >(and amd64 even has that sweet CAM filter on the tlbs to mitigate the >effect even if you run a 32 bit kernel) > 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.
-- Manfred
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