Messages in this thread | | | Date | Tue, 15 Apr 2008 22:27:15 -0600 | From | Robert Hancock <> | Subject | Re: x86 git tree broken (bisected) |
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Rafael J. Wysocki wrote: > On Monday, 14 of April 2008, Yinghai Lu wrote: >> On Mon, Apr 14, 2008 at 1:21 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote: >>> On Monday, 14 of April 2008, Yinghai Lu wrote: >>> > On Sun, Apr 13, 2008 at 5:19 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote: >>> > > >>> > > On Monday, 14 of April 2008, Yinghai Lu wrote: >>> > > > On Sun, Apr 13, 2008 at 3:10 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote: >>> > > > > >>> > > > > On Monday, 14 of April 2008, Yinghai Lu wrote: >>> > > > > > On Sun, Apr 13, 2008 at 9:12 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote: >>> > > > > > ... >>> > > > > > > > can you try to apply the patch i sent to you about agp bridge order >>> > > > > > > > reading for buggy silicon? >>> > > > > > > > >>> > > > > > > > Please boot kernel with "debug"... >>> > > > > > > > >>> > > > > > > > I want to verify if you can get >>> > > > > > > > >>> > > > > > > > " >>> > > > > > > > Aperture conflicts with PCI mapping. >>> > > > > > > > " >>> > > > > > > > >>> > > > > > > > in your boot log... >>> > > > > > > >>> > > > > > > It's not present in there: >>> > > > > > > >>> > > > > > > rafael@albercik:~> grep Aperture failing-with-patch-dmesg.log >>> > > > > > > Aperture too small (32 MB) >>> > > > > > > Aperture from AGP @ de000000 size 4096 MB (APSIZE 0) >>> > > > > > > Aperture too small (0 MB) >>> > > > > > > agpgart: Aperture pointing to RAM >>> > > > > > > agpgart: Aperture from AGP @ de000000 size 4096 MB >>> > > > > > > agpgart: Aperture too small (0 MB) >>> > > > > > > >>> > > > > > > Full dmesg output attached. >>> > > > > > >>> > > > > > please check attached debug patch. and check if you can change GART >>> > > > > > size in your BIOS setup to 64M instead of 32M >>> > > > > >>> > > > > Hm, what tree am I supposed to apply it too: >>> > > > > (1) current x86 git >>> > > > > (2) current x86 git w/ some of your previous patches (which ones in this case) >>> > > > > (3) failing (old) x86 git >>> > > > > (4) failing (old) x86 git w/ some of your previous patches (which ones in this >>> > > > > case)? >>> > > > >>> > > > (1) current x86.git >>> > > >>> > > Attached is dmesg output from current x86.git with debug_gart_checking.patch >>> > > applied. >>> > >>> > please test the final one ... ... >>> > >>> > You should get back 64M memory back. >>> >>> Tested (current x86.git), dmesg output attached. >> thanks. >> >> looks good. as expected... >> >> Checking aperture... >> AGP bridge at 00:04:00 >> Aperture from AGP @ de000000 old size 32 MB >> Aperture size 4096 MB (APSIZE 0) is not right, using settings from NB >> Aperture from AGP @ de000000 size 32 MB (APSIZE 0) >> Node 0: aperture @ de000000 size 32 MB >> Aperture too small (32 MB) than (64 MB) >> ... >> agpgart: Detected AGP bridge 20 >> Setting up ULi AGP. >> agpgart: AGP aperture is 32M @ 0xde000000 > > BTW, what exactly would be the benefit of increasing the aperture size, given > that I use a PCI Express graphics adapter?
The kernel uses the AGP GART aperture as an IOMMU. If you have >4GB of RAM and lots of devices with DMA addressing limits, more GART space would help prevent the IOMMU space from being exhausted.
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