Certainly 750~800 fps in glxgears vs 3000+ in debian squeeze, i cant bring myself to say that it's an acceptable situation no matter how tired i am of the problem knowing how well the setup could do. It's clear that the implementation is broken for everything but x86, if that's a acceptable situation to then perhaps a recommendation to use a BSD derived system on everything other then x86 ought be the recommended not more hacky crippling workarounds, this is turning into a hackjob resembling the 90's already, just to get to anything remotely functional. Might as well deprecate the entire AGP system
On 8 February 2016 at 12:41, Boris Reinhard <reinhard.bo...@googlemail.com> wrote: > Definitely would have made sense for years, but could someone possibly > look into a proper solution? > > Michel Dänzer <mic...@daenzer.net> schrieb am Mo., 8. Feb. 2016 11:00: > >> On 05.02.2016 11:47, Mike wrote: >> > Hi. >> > Managed to get the Radeon R300 running on mesa 11.1.1 with an old 2013 >> > patch from Michel Dànzer, next problem is of course enabling agpmode, >> > running with pci-mode with radeon.agpmode=-1 works, but is of course >> > slow, and seems to load the cpu a lot. >> > >> > Upon initial investigation i could not initially believe agp could be >> > this this broken for this long, until i found this. >> > "committed with Ben Skeggs on Feb 26, 2013" >> > >> https://github.com/DespairFactor/bullhead/commit/650e1203c11354ba84d69ba445abc0efcfe3890a >> > >> http://lxr.free-electrons.com/source/drivers/gpu/drm/nouveau/nouveau_agp.c?v=4.2 >> > #ifdef __powerpc__ >> > /* Disable AGP by default on all PowerPC machines for >> > * now -- At least some UniNorth-2 AGP bridges are >> > * known to be broken: DMA from the host to the card >> > * works just fine, but writeback from the card to the >> > * host goes straight to memory untranslated bypassing >> > * the GATT somehow, making them quite painful to deal >> > * with... >> > */ >> > if (nouveau_agpmode == -1) >> > return false; >> > #endif >> > >> > and now later this: >> > >> https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/nouveau/nvkm/subdev/pci/agp.c >> > #ifdef __powerpc__ >> > /* Disable AGP by default on all PowerPC machines for now -- At >> > * least some UniNorth-2 AGP bridges are known to be broken: >> > * DMA from the host to the card works just fine, but writeback >> > * from the card to the host goes straight to memory >> > * untranslated bypassing that GATT somehow, making them quite >> > * painful to deal with... >> > */ >> > mode = 0; >> > #endif >> > >> > All seems to point to serious issues had around the time of change to >> > ums to kms and a serious regression hitting the linux kernel? No? >> >> Not really. UMS was just using a static GART mapping, whereas KMS is >> dynamically binding pages into the GART as needed. Apparently, older >> revisions of UniNorth have trouble with the latter. I think it would >> make sense to change radeon.agpmode to default to -1 on powerpc as well. >> Any takers? >> >> >> -- >> Earthling Michel Dänzer | http://www.amd.com >> Libre software enthusiast | Mesa and X developer >> _______________________________________________ >> Linuxppc-dev mailing list >> Linuxppc-dev@lists.ozlabs.org >> https://lists.ozlabs.org/listinfo/linuxppc-dev > >
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