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Date: Sat, 6 Nov 2010 20:28:13 +0100 From: Nico <segfault2@...mail.com> To: linux-kernel <linux-kernel@...r.kernel.org> Subject: AGP Aperture question Hi, I just assembled a new machine here based on an MSI 770-C45 mobo with an Phenom II X4 955 CPU. Everything is running flawlessly (on 2.6.36), after fiddling a bit with my old disks, but today after going through the dmesg, I noticed the following which got me curious and would also like to know if I should worry about it or of it has any bad impact on something... Checking aperture... No AGP bridge found Node 0: aperture @ 20000000 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 Mapping aperture over 65536 KB of RAM @ 20000000 and later on in dmesg, I see the following... PCI-DMA: Disabling AGP. PCI-DMA: aperture base @ 20000000 size 65536 KB PCI-DMA: using GART IOMMU. PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture I looked in my BIOS settings but couldn't find anything about Aperture or IOMMU. There's no such option at all in there. So, is the above something to be concerned about? Does it have any negative impact on the system? Please CC me as I'm not subbed to the list :) Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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