[MPlayer-users] Playing ultra-high resolution video

[Loren Merritt]

On Thu, 17 May 2007, Reimar Döffinger wrote:

> How do you know the bandwidth is there? The normal way to do this means
> the OS must copy the data out of the cache into application memory and
> then from application memory to video memory (if you're unlucky
> involving yet anotehr copy to memory). Can your memory really handle the
> 1.5 to 2.2 GB/s needed for that, in addition to the load caused by
> trashing the cache completely during each copy?

Does it trash the cache? Both MPlayer's fast_memcpy and glibc's memcpy 
use prefetchnta/movntq for sufficiently large copies.

--Loren Merritt