Messages in this thread | | | Date | Fri, 12 Mar 2004 23:49:35 -0800 | From | Bryan Rittmeyer <> | Subject | Re: [PATCH] ppc32 copy_to_user dcbt fixup |
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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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