Re: [patch] context-switching overhead in X, ioport(), 2.6.8.1

[Ingo Molnar]

* Andi Kleen <ak@xxxxxx> wrote:

> > Xorg and XFree assume the kernel will have intelligent limits. When the
> > range went up the EnableIO code in turn switched to ioperm.
> 
> Which was the wrong thing to do since it is slower.

it is not significantly slower with older kernels or with the patch
applied, and it's safer than an all-ports iopl(3).

	Ingo
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