[cairo] Very slow performance

Keith Packard keithp at keithp.com
Tue Dec 28 12:05:27 PST 2004

Around 18 o'clock on Dec 28, Soeren Sandmann wrote:

> In my tests when I did the MMX stuff in xorg, 128 bit reads/writes
> were not an improvement over 64 bit read/writes on the systems I
> tested on. On some - but not all - systems, 64 bit was an improvement
> over 32 bit.

Were these tests to AGP or PCI video memory?  Or main machine memory?  I 
have been lead to believe that MMX/SSE copy and fill code can run faster 
than regular instructions because of the way they connect to the main 
memory interface.


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