Messages in this thread | | | Subject | Re: [PATCH] [2/2] POWERPC: Lower threshold for DART enablement to 1GB, V2 | From | Benjamin Herrenschmidt <> | Date | Fri, 14 Apr 2006 08:38:31 +1000 |
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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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