On 10/31/07, Thomas Hellström <[EMAIL PROTECTED]> wrote: > Dave, > > When starting out with TTM i did look a little at AGP caching issues and > there was an issue with cached memory and speculative pre-fetching that > may affect the mapped-cached memory, > and that we need to know about but perhaps ignore. > > Suppose you bind a page to the AGP aperture, but don't change the kernel > linear map caching policy. > Then a speculatively prefetching processor may read the memory into its > cache and then decide it doesn't > want to use it, and actually write it back. > Meanwhile the GPU may have changed the contents of the page and that > change will be overwritten. Apparently there were big problems with AMD > Athlons actually doing this. Linux people claiming it was an Athlon bug > and AMD people claiming it was within specs. >
http://www.linuxjournal.com/files/linuxjournal.com/linuxjournal/articles/061/6148/6148s1.html Is what I believe you are talking about, I'll add something to the comment mentioning this.. Dave. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
