Hi. Looking at the irc discussion
http://dri.egore911.de/index.php?page=dri-devel-2007-04-30.log 23:31 <+anholt> <javascript:addUser('<+anholt>');> the userland interface of ttm is unacceptably bad. I've got some concerns about deadlock with it. The general fencing flags appear to be too limited, and extending that appropriately means you don't need DD flags 23:31 <+anholt> <javascript:addUser('<+anholt>');> we want zero-copy data upload when appropriate, which doesn't appear to be possible currently and ... 23:34 < krh> <javascript:addUser('< krh>');> anholt: is it mostly the user space interface or are you looking at a deeper rewrite? 23:34 <+anholt> <javascript:addUser('<+anholt>');> krh: everything I've encountered in ttm so far has made me want to rewrite it Eric, As some people are planning to put some work into fixing parts of the code up, it would be nice if you could share your thoughts on DRI-devel and be a little more specific. The userspace part indeed needs to be looked at, for many reasons, but above all 64-bit padding and future expansion. Support for zero-copy data uploads (drm_bo_type_user) is just a matter of implementing it, which is a very easy task but requires cache-coherent high-memory allowing PTEs which are not generally available on all architectures and texturing from them is a bit slow and prone to hangs on i915. As for the kernel side, some parts look hairy but there is probably a reason why, so don't hesitate to ask. There is a fair amount of trial-and-error time put down in the code to figure out what's working and what's not. Identifying the parts that need fixing and making a common effort to fix them is probably a better way than to do another rewrite in the dark to find out later that there is yet another opinion on how to do things and we're getting nowhere. Since you're one of the few who has looked at the code in-depth and tried to figure out what it does, your suggestions are very valuable. Regards, Thomas ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
