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SubjectRe: AGP and PAT (induced?) problem (on AMD family 6)
On 06-08-08 15:51, Andreas Herrmann wrote:

> On Mon, Aug 04, 2008 at 06:30:32PM +0200, Rene Herman wrote:
>> What _does_ solve this though is booting with the "nopat" command line
>> parameter. I'm on and have enabled PAT for my AMD Duron myself.
>> With "nopat", there's no problem to be seen anymore -- exiting X
>> specifically is instantaneous.
>> With or without PAT, my /proc/mtrr is always:
>> reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
>> reg01: base=0x20000000 ( 512MB), size= 256MB: write-back, count=1
>> reg02: base=0xe8000000 (3712MB), size= 64MB: write-combining, count=1
>> under X joined by:
>> reg03: base=0xe4000000 (3648MB), size= 32MB: write-combining, count=2
> To get some more debug data, can you please retest with latest kernel
> (2.6.27-rc2)

Problem present on vanilla -rc2.

> using "debugpat" kernel option and provide dmesg output

No... my kernel message buffer isn't large enough for that :-(

Right, I guess I now know where the delay is coming from. I suppose this
is not expected. dmesg as captured after starting X and without
"debugpat" at:

Truncated dmesg with "debugpat":

> plus contents of <debugfs>/x86/pat_memtype_list?

Before starting X (1K):

After starting X (625K):

(This is with 64MB AGP memory)

More data:


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