Messages in this thread | | | Date | Thu, 30 Oct 2008 07:24:34 +1000 | From | "Dave Airlie" <> | Subject | Re: [PATCH] disable CPU side GART accesses |
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On Thu, Oct 30, 2008 at 6:52 AM, Bob Montgomery <bob.montgomery@hp.com> wrote: > On Mon, 2008-10-27 at 23:06 +0000, Yinghai Lu wrote: >> Bob Montgomery wrote: >> > On Wed, 2008-10-15 at 23:48 +0000, Ingo Molnar wrote: >> >> (Cc:-ed the GART folks.) >> > >> > Are there any objections to this patch? The problem has been reproduced >> > in 2.6.18 and 2.6.27, so existing changes in the gart code have not >> > addressed it. >> >> better to have someone with amd system + 8g ram + agp adapter to verify it... >> >> YH > > Good idea. > > I don't think HP made a system with opteron and agp, so I haven't found > a system here to test. But I did see that there have been non-HP > motherboards from several years ago that advertised opteron with agp. > Anyone running that type of system? > > The other question is whether AGP graphics on linux for amd64 ever > expected host translation to work, since setting DisGartCpu is turning > off host translation.
We have an option in the AGP drivers called cant_use_aperture.
This stops the CPU from using the aperture for most DRI things. I can't confirm this won't regress working systems though. The whole AMD GART thing scares me, esp if some of the host chipsets also have an AGP GART.
Dave.
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