On 27/06/17 08:39 AM, John Brooks wrote: > On Mon, Jun 26, 2017 at 03:39:57PM +0200, Christian König wrote: >> From: Christian König <christian.koenig at amd.com> >> >> Limit the size of the GART table for the system domain. >> >> This saves us a bunch of visible VRAM, but also limitates the maximum BO size we can swap out. >> >> Signed-off-by: Christian König <christian.koenig at amd.com> > > Hmm. > > On my system, GTT is 4096MiB (1048576 pages). For this, the table takes up > 1048576*8 bytes = 8MiB. Reducing GTT to 256MiB (65536 pages) would reduce the > size of the table to 512 KiB. A relatively large saving, to be sure. But in the > grander scheme of things, is saving 7.5MiB (3% of visible VRAM @ 256M) worth > cutting GTT memory by a factor of 16? I'm afraid not, especially since it would limit the maximum BO size to < 256MB, if I understand correctly. Pretty sure that would cause failures with real world apps. -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer
