Around 13 o'clock on Oct 22, Ian Romanick wrote: > I would recommend an audit then a copy, with the DMA buffer being setup as > non-cached, write combining memory (like AGP mapped memory).
Non-cached write combining memory doesn't go through the regular cache buffers and is significantly slower than cached writes; that's one of the reasons AGP writes are so slow. Cached writes will force cacheline fills, which will double the amount of data transfered when doing the copies. P4 and Athlon memory architectures aren't exactly optimized for this operation. Keith Packard XFree86 Core Team HP Cambridge Research Lab ------------------------------------------------------- This sf.net emial is sponsored by: Influence the future of Java(TM) technology. Join the Java Community Process(SM) (JCP(SM)) program now. http://ad.doubleclick.net/clk;4699841;7576301;v?http://www.sun.com/javavote _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
