Re: [Linux-fbdev-devel] Re: fbcon slowness [was NTP on 2.4.2?]
Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 2 Apr 2001 23:44:37 +0100 (BST)
> Yes this is problem. See my response to Paul about this. The only reason
> I'm using MMX for the vesa framebuffer because it has no acceleration. MMX
> gives a big boost for genuine intel chips. Other types of MMX are fast but
> they don't seemed to be optimized for memory transfers like MMX on intel
> chips. I also have regular code that does all kinds of tricks to optimize
Then you are doing something badly wrong.
The MMX memcpy for CyrixIII and Athlon boxes is something like twice the
speed of rep movs. On most pentium II/III boxes the fast paths for rep movs
and for MMX are the same speed
Alan
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