Messages in this thread | | | Date | Thu, 3 Feb 2011 12:25:05 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH - resend] memblock: Don't adjust size in memblock_find_base() |
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On Fri, 28 Jan 2011 16:37:47 -0800 Yinghai Lu <yinghai@kernel.org> wrote:
> > While applying patch to use memblock to find aperture for 64bit x86. > Ingo found system with 1g + force_iommu > > > No AGP bridge found > > Node 0: aperture @ 38000000 size 32 MB > > Aperture pointing to e820 RAM. Ignoring. > > Your BIOS doesn't leave a aperture memory hole > > Please enable the IOMMU option in the BIOS setup > > This costs you 64 MB of RAM > > Cannot allocate aperture memory hole (0,65536K)
I'm trying to work out if we should backport this fix into earlier kernels and as is often the case, I wasn't given enough information.
What are the end-user visible effects of this? The kernel cannot use the AGP bridge? 64MB of RAM wasted? Something else?
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