On Thu, 19 May 2011 07:54:48 +1000
Benjamin Herrenschmidt [off-list ref] wrote:

On Wed, 2011-05-18 at 16:51 -0500, Scott Wood wrote:

quoted

On Thu, 19 May 2011 07:37:47 +1000
Benjamin Herrenschmidt [off-list ref] wrote:

quoted

On Wed, 2011-05-18 at 16:05 -0500, Scott Wood wrote:

quoted

A little more speed up measured on e5500.

Setting of U0-3 is dropped as it is not used by Linux as far as I can
see.

Please keep them for now. If your core doesn't have them, make them an
MMU feature.

We have them, it was just an attempt to clean out unused things to speed up
the miss handler.  I'll drop that part if you think we'll use it in the
future.

I never know for sure ... damn research people ... :-)

I'd rather keep them for now, does it make a significant difference ?

It was minor but measurable (wouldn't have been worthwhile except as part
of a series of small things that add up), but upon trying again I was able
to reorder slightly and fit it in without seeing an impact.

-Scott