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    SubjectRe: Hugepages demand paging V2 [0/8]: Discussion and overview
    Date
    On Monday, October 25, 2004 7:23 pm, William Lee Irwin III wrote:
    > On Mon, Oct 25, 2004 at 06:26:42PM -0700, Christoph Lameter wrote:
    > > - Clearing hugetlb pages is time consuming using clear_highpage in
    > > alloc_huge_page. Make it possible to use hw assist via DMA or so there?
    >
    > It's possible, but it's been found not to be useful. What has been found
    > useful is assistance from much lower-level memory hardware of a kind
    > not to be had in any extant mass-manufactured machines.

    Do you have examples? SGI hardware has a so-called 'BTE' (for Block Transfer
    Engine) that can arbitrarily zero or copy pages w/o CPU assistance. It's
    builtin to the memory controller. Using it to zero the pages has the
    advantages of being asyncrhonous and not hosing the CPU cache.

    Jesse
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