Re: AGP and PAT (induced?) problem (on AMD family 6)
From: Rene Herman
Date: Wed Aug 06 2008 - 16:58:13 EST
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 2.6.26.1 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:
http://members.home.nl/rene.herman/pat/dmesg.x
Truncated dmesg with "debugpat":
http://members.home.nl/rene.herman/pat/dmesg.x.debugpat
plus contents of <debugfs>/x86/pat_memtype_list?
Before starting X (1K):
http://members.home.nl/rene.herman/pat/pat_memtype_list.console.debugpat
After starting X (625K):
http://members.home.nl/rene.herman/pat/pat_memtype_list.x.debugpat
(This is with 64MB AGP memory)
More data:
http://members.home.nl/rene.herman/pat/config-2.6.27-rc2-current
http://members.home.nl/rene.herman/pat/xorg.conf
http://members.home.nl/rene.herman/pat/Xorg.0.log
Thanks,
Rene
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