On Tue, Dec 15, 2009 at 11:27 AM, Keith Whitwell <[email protected]> wrote: > On Tue, 2009-12-15 at 01:49 -0800, Marek Olšák wrote: >> On Tue, Dec 15, 2009 at 10:28 AM, Keith Whitwell <[email protected]> wrote: >> > On Mon, 2009-12-14 at 16:31 -0800, Marek Olšák wrote: >> >> On Mon, Dec 14, 2009 at 5:42 PM, Corbin Simpson >> >> <[email protected]> wrote: >> >> > As far as immediate verts, why don't we just add support to r300g to >> >> > switch >> >> > to immediate mode for small VBOs? >> >> > >> >> > Posting from a mobile, pardon my terseness. ~ C. >> >> > >> >> >> >> Corbin, >> >> >> >> that seems reasonable, and it's the reason I killed the draw_quad >> >> function. BTW immediate mode doubles the performance in glxgears. >> > >> > Shouldn't gears upload its vertices one time only and then leave them >> > resident in VRAM? >> > >> > Keith >> > >> > >> >> I meant the clear path with a quad using immediate mode, that made the >> difference in comparison with a straightforward VBO path. > > OK, understood. > > I'm interested to understand why the VBO path is slow. Is it the > allocation of the VBO itself? Mapping & uploading the vertices? > Command submission (the extra reloc)? > > It seems to me that none of these should be taking half your time. In > fact, it makes me wonder if there wasn't something else going on -- eg. > was the same buffer getting reused to hold those 4 vertices frame after > frame, resulting in a sync when the driver tried to map the buffer? > > That could be happening in the state tracker or in the driver, I guess. > > Keith >
Yes, the same buffer was getting reused every frame causing sync when mapping the buffer. However, it will no longer be an issue once immediate mode gets implemented. Using DONT_WAIT would probably also help here. Please, could you possibly look at the patches I sent to you approximately 16 hours ago? (there are 7 of them) Marek ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Mesa3d-dev mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
