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DateFri, 12 Mar 2004 23:49:35 -0800
FromBryan Rittmeyer <>
SubjectRe: [PATCH] ppc32 copy_to_user dcbt fixup
On Sat, Mar 13, 2004 at 03:50:03PM +1100, Benjamin Herrenschmidt wrote:
> It would be wise to make the dcbz as long as possible in "advance"
> before the actual write to the cache line.

I guess we could try "pre-dcbz" ala the dcbt prefetch code.
Even dcbz right before stw is probably cheaper than RAM
loading data that will be totally overwritten. It's hard to
lose eliminating bus I/O (especially reads).

Any comments on the dcbt prefetch patch?

-Bryan

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