On Sat, Jan 8, 2011 at 2:07 AM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > I've been looking at how we can improve upload/download performance on our > UMA gfx. One under-used aspect of the IGP is its ability to blit between > snooped-and-unsnooped memory i.e. from normal ram into the GTT. Only the > BLT has this ability, almost all other functions of the GPU most be from > unsnooped memory. SNB introduces its own cache handling that we need to > exploit further, however the BLT remains and is orders of magnitude faster > for read back than an UC read by the CPU... You might want to test this on a 945G era machine, I think I tried to get this working back in the TTM days, I got a lot of crashes and pain and suffering. But I might have had bad ops happening occasionally or something. Dave. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
