On Sun, 2009-08-02 at 15:56 +0200, Jerome Glisse wrote: > On Sun, 2009-08-02 at 08:53 +1000, Dave Airlie wrote: > > On Sun, Aug 2, 2009 at 12:48 AM, Jerome Glisse<[email protected]> > > wrote: > > > > > > Corollary the TTM priority stuff is i believe a wrong idea > > > for radeon (could be usefull for others GPU but i don't have > > > such feeling). So i would like to be able to disable it and > > > move the knowledge in radeon kernel driver, here is my thinking > > > on that : > > > > > > domain provided by userspace is a tip given to the kernel > > > Then the kernel driver will be the one to choose where to > > > put the buffer. For instance userspace can create an object > > > in GTT space because this object will routinely accessed > > > by the CPU, but at one point the GPU might need to write to > > > it and most of the time we really want to put all buffer > > > the GPU write to into VRAM. So kernel could move the object > > > to VRAM for doing the rendering. > > > > > > Any thoughts on that ? > > > > The whole problem with aperture sizing and when to flush > > optimally is quite messy when things are just hints. Maybe > > you need to redesign CS with stream break points, I think > > Thomas did or was thinking about this for Openchrome. > > Nothings change for counting how memory a cs needs, it makes > the code simpler as there is only one domain and its up to > ddx to properly ask for vram on object which are dst. So > accounting for gtt/vram use is the same, code is just simpler.
The way it's done now, the kernel can transparently put a source BO in GTT if there's no space in VRAM. How would that be handled with your idea? > Also while testing, it seems current code space checking > fails hard with 16M vram, 16M gtt > VRAM usage: > 7M for fbcon, 7M for front buffer, so pretty much no vram left I'm working on fixing the fbcon BO always being pinned in VRAM, almost done. :) -- Earthling Michel Dänzer | http://www.vmware.com Libre software enthusiast | Debian, X and DRI developer ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july -- _______________________________________________ Dri-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dri-devel
