Re: [PATCH] drm: i915: ensure objects are allocated below 4GB onPAE
From: Peter Zijlstra
Date: Tue May 26 2009 - 17:42:03 EST
On Tue, 2009-05-26 at 14:35 -0700, Eric Anholt wrote:
> On Tue, 2009-05-26 at 21:17 +0200, Peter Zijlstra wrote:
> > On Tue, 2009-05-26 at 12:27 -0400, Kyle McMartin wrote:
> > > From: Kyle McMartin <kyle@xxxxxxxxxx>
> > >
> > > Ensure we allocate GEM objects below 4GB on PAE machines, otherwise
> > > misery ensues. This patch is based on a patch found on dri-devel by
> > > Shaohua Li, but Keith P. expressed reticence that the changes unfairly
> > > penalized other hardware.
> > >
> > > (The mm/shmem.c hunk is necessary to ensure the DMA32 flag isn't used
> > > by the slab allocator via radix_tree_preload, which will hit a
> > > WARN_ON.)
> > Why is this, is the gart not PAE friendly?
> > Seems to me its a grand way of promoting 64bit hard/soft-ware.
> No, the GART's fine. But the APIs required to make the AGP code
> PAE-friendly got deprecated, so the patches to fix the AGP code got
> NAKed, and Venkatesh never sent out his patches to undeprecate the APIs
> and use them.
> It's been like 6 months now, and it's absurd. I'd like to see this
> patch go in so people's graphics can start working again and stop
> corrupting system memory.
For .30 yes, for .31 we need to resolve that AGP issue, 6 months does
seem excessive to get something like that sorted.
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