Messages in this thread | | | From | David Mosberger <> | Date | Fri, 2 Aug 2002 09:38:12 -0700 | Subject | Re: adjust prefetch in free_one_pgd() |
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>>>>> On 02 Aug 2002 18:49:27 +0100, Alan Cox <alan@lxorguk.ukuu.org.uk> said:
Alan> I can't think of anything cachable with nasty side effects we Alan> might encounter right now but one day someone will do it just Alan> to be annoying.
Cacheable and side-effects don't go together. Even without explicit software prefetches, most modern CPUs will happily and aggressively prefetch stuff from cacheable translations.
That's (partly) why we have this strange situation where execution in virtual address space is actually _faster_ than in physical space, even though the former involves more work per memory access.
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