Re: [PATCH 3.1?] x86: Remove useless stts/clts pair in __switch_to

[Ingo Molnar]

* Andrew Lutomirski <luto@xxxxxxx> wrote:

> > Also, if you are tempted by the prospect of possibly enabling 
> > vector instructions for the x86 kernel, we could try that too, 
> > and get multiple speedups for the price of having to debug the 
> > tree only once ;-)
> 
> I'll play with it.  I have some other cleanup / speedup ideas, too, 
> and I'll see where they go.  Given that the kernel doesn't really 
> use floating-point math, I'm not sure that gcc will do much unless 
> we turn on -ftree-vectorize, and that's a little scary.

It's indeed scary - but as long as it boots it would allow some 
baseline figures to be estimated - is there any win, and if yes, how 
much. It might be a complete dud in the end.

Thanks,

	Ingo
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