Mersenne: Re: Large memory pages in Linux

[Matthias Waldhauer]

For a TLB aware client like Prime95 the improvements are small as 
expected. But I'm sure that speedups greater than ~2.5% are possible by 
modifying the FFTs to make optimal use of large pages. For most FFT 
sizes currently in use the available number of 2/4MB TLB entries cover 
the complete working set. But for larger sizes it is again necessary to 
take care of TLB entries.

Last friday I read some messages about recent kernel modifications and 
patches for version 2.6.0. There is an "imcplicit_large_page" patch, 
allowing applications to use large pages without modifications. I don't 
have the time to dig into it :(

I wish you all a Merry Chistmas!

Matthias

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