On 2020-05-13 9:46 a.m., Christian König wrote: > Am 12.05.20 um 23:12 schrieb Alex Deucher: >> On Tue, May 12, 2020 at 4:52 PM Roy Spliet <nouveau@xxxxxxxxxx> wrote: >>> >>> I'll volunteer to be the one asking: how big is this performance >>> difference? Have any benchmarks been run before and after removal of AGP >>> GART code on affected nouveau/radeon systems? Or is this code being >>> dropped _just_ because it's cumbersome, with no regard for metrics that >>> determine the value of AGP GART support? >>> >> I don't think anyone has any solid numbers, just anecdotal from >> memory. I certainly don't have any functional AGP systems at this >> point. It's mostly just cumbersome and would allow us to clean ttm >> and probably improve stability at the same time. At least on the >> radeon side, the only native AGP cards were r1xx, r2xx, and some of >> the early r3xx boards. Once we switched to pcie mid-way through r3xx, >> everything was native pcie and the AGP cards used a pcie to AGP bridge >> chip so they had a decent on chip MMU. Those older cards topped out >> at maybe 32 or 64 MB of vram, so they are going to be hard pressed to >> deal with modern desktops anyway. No idea what sort of GART >> capabilities NV AGP hardware at this time had. > > I could only test with an old x86 Mac and an r3xx generation hw and in > this case making the switch didn't had any noticeable effect at all. > > But I didn't do more than playing around with the desktop effects and > playing a video. Yeah, that's not enough to see a difference. Try an OpenGL game, or even just glxgears. -- Earthling Michel Dänzer | https://redhat.com Libre software enthusiast | Mesa and X developer _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
