Messages in this thread |  | | | Date | Tue, 15 Apr 2008 22:27:15 -0600 | | From | Robert Hancock <> | | Subject | Re: x86 git tree broken (bisected) | |
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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