Re: [PATCH] Athlon/Opteron Prefetch Fix for 2.6.0test5 + numbers

[Linus Torvalds]

On Wed, 17 Sep 2003, Nick Piggin wrote:
> 
> What is intriguing to me is the "Its only a 2% slowdown of the page
> fault for every cpu other than K[78] for this single workaround. There
> is no point to conditional compilation" attitude some people have.

I wouldn't worry about performance as much as correctness. I'm a lot more
worried about the notion of taking recursive pagefaults than about 2%.

Which means that I think the code should be disabled on non-buggy 
hardware. Not becuase of the 2%, but because it just exposes the potential 
of new bugs.

		Linus

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