Re: why does the macro "ZERO_PAGE" take an argument?

[H. Peter Anvin]

William Lee Irwin III wrote:
> Robert P. J. Day wrote:
>>> although it's not clear where in the source tree are the invocations
>>> that would actually make a difference to a MIPS system, which is why
>>> i've CC'ed ralf on this.  i'm sure he can clear this up. :-)
> 
> On Thu, Jun 07, 2007 at 10:32:29AM -0700, H. Peter Anvin wrote:
>> x86 could also benefit from coloured zeropages.  In fact, I thought it
>> already had them (K8 wants as many as 8.)
> 
> How would one demonstrate the beneficial effect of such?

Dean Gaudet at Transmeta did some benchmarking using SPEC.  If I recall
his numbers correctly (this is from memory, mind you) on Transmeta
Efficeon, which has 2-way virtual cache tagging with hardware recovery,
zeropage coloring was a 1.5% performance improvement.

	-hpa

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