Re: 3c59x (was Route cache performance under stress)

[Jeff Garzik <jgarzik@xxxxxxxxx>]

On Tue, Jun 10, 2003 at 06:20:29PM +0200, Andi Kleen wrote:
> Can't you just wrap it in a few macros and offer a config for those
> who want the best performance and a runtime test for the others?
> Then switch between PIO and mmio dynamically.
> 
> Even runtime test should be pretty painless these days, the CPU normally
> can execute hundreds or even thousands of tests in the time it takes to 
> wait for an mmio or even PIO.

I prefer a compile-time test.  But yes, this is what several other
net drivers do:  offer a config option for MMIO (or PIO), and the
default is MMIO unless that is known to be unsafe on certain boards
(which, unfortunately, it is).

        Jeff