On Thu, 2006-04-13 at 17:27 -0500, Olof Johansson wrote:
> On Fri, Apr 14, 2006 at 06:51:55AM +1000, Benjamin Herrenschmidt wrote:
>
> > an improvement with the DART thanks to virtual merging. Currently, we
> > pay a cost due to our stupid invalidate mecanism that we should really
> > fix by shooting the TLB directly.
>
> What was keeping me from implementing this before was the lack of public
> documentation on how to do it. Has that changed? I'd be happy to do the
> implementation.
Darwin has the macros to access the TLB though it doesn't use them... I
suppose I can get the necessary doco bit from the microelectronics folks
for the CPC925, that should apply to U3 as well, though U4 has a
different format afaik. I'll dig and will come back to you.
> > Also have you made sure all your
> > additions for handling crappy hardware are nicely wrapped in unlikely()
> > statements ? :)
>
> I would expect the dynamic predictor to work quite well on this. I'm not
> worried about the overhead of the tests as much as the overhead of
> having to enable the DART for smaller configs. If benchmark profiling
> shows different down the road then we can add them.
Ok.
Ben.
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