Re: Athlon fast_copy_page revisited

Brian Gerst (bgerst@didntduck.org)
Wed, 30 May 2001 15:06:33 -0400

Alan Cox wrote:
>
> > schemes in user-space but if I try in kernel space, I get the notorious crash inside
> > fast_copy_page. (If there was some sort of fundamental hardware problem associated with
> > prefetch or streaming, wouldn't it also show up in user-space?) Note: I've yet to try the
>
> That has been one of the great puzzles. There are patterns that are very
> different in kernel space - notably physically linear memory and code running
> from a 4Mb tlb.

Have you tried hacking the kernel to only use 4k page tables (ie. filter
out the PSE capability bit)? A shot in the dark, but probably worth
trying.

--


				Brian Gerst
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