Re: MTRR/NOMTRR comparison
Richard Gooch (rgooch@atnf.csiro.au)
Sun, 14 Mar 1999 21:35:44 +1100
Tigran Aivazian writes:
> Hi,
>
> You said:
> > Some operations were slighly slower with a MTTR, most about the same,
> > and some significantly faster.
>
> Of course, it is interesting to run x11perf*(1) and analyze the
> output. However, in very practical concrete sense, I am running an
> OpenGL-based solar system simulator (ssystem) and seeing a huge fps
> improvement added by MTRRs on a system almost identical to yours -
> about 20-30% speed improvement. (the 2.5x improvement claimed in the
> docs is if all you do is bitblt-ing your stuff without doing any
> calculations, whilst "real-world" apps spend most of the time
> multiplying matrices and calculating sin()/cos() (unless they are so
> clever as to use pre-calculated tables))
Ahem. http://www.atnf.csiro.au/karma/
Plenty of real-world applications which get the full 2.5x
speedup. Yep, they do a lot of bitblitting. Pure bitblitting *is* used
in the real world.
Regards,
Richard....
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