H. Peter Anvin wrote:
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.
I'm surprised that the benchmark made such use of zero pages so as to
be worthwhile. I'm sitting on a patch which removes the zero page from
the page fault fastpath completely which I'd like to try out in -mm...
--
SUSE Labs, Novell Inc.
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