linux-kernel - Re: Intel driver vs MTRRs conflict

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Date:	Wed, 18 Feb 2009 23:50:22 +0100
From:	"J.A. Magallón" <jamagallon@....com>
To:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Intel driver vs MTRRs conflict

On Tue, 17 Feb 2009 17:31:08 -0800, "H. Peter Anvin" <hpa@...or.com> wrote:

> J.A. Magallón wrote:
> > 
> > As I said, everything works. And even fast for the kind of machine, it's an
> > Aspire One and gears gives 740 fps, and video playback is pretty smooth.
> > But perhaps it would be faster if X could get that mtrr it claims ?
> > 
>

Sorry for the delay...
 
> Which CPU?
> 

Atom N270, 1.60GHz, hyperthreaded. 512Kb cache

I have realized that I boot with video=intelfb:mtrr,ywrap.
Could this be interferring ?

Things in syslog I think are relevant:

Feb 17 23:45:47 one klogd: x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
Feb 17 23:45:47 one klogd: original variable MTRRs
Feb 17 23:45:47 one klogd: reg 0, base: 4194176KB, range: 128KB, type WP
Feb 17 23:45:47 one klogd: reg 1, base: 4194048KB, range: 128KB, type UC
Feb 17 23:45:47 one klogd: reg 2, base: 0GB, range: 256MB, type WB
Feb 17 23:45:47 one klogd: reg 3, base: 256MB, range: 256MB, type WB
Feb 17 23:45:47 one klogd: reg 4, base: 504MB, range: 8MB, type UC
Feb 17 23:45:47 one klogd: reg 5, base: 502MB, range: 2MB, type UC
Feb 17 23:45:47 one klogd: reg 6, base: 501MB, range: 1MB, type UC
Feb 17 23:45:47 one klogd: reg 7, base: 0GB, range: 128KB, type UC
Feb 17 23:45:47 one klogd: total RAM coverred: 501M
Feb 17 23:45:47 one klogd: Found optimal setting for mtrr clean up
Feb 17 23:45:47 one klogd:  gran_size: 64K ^Ichunk_size: 16M ^Inum_reg: 4  ^Ilose cover RAM: 0G
Feb 17 23:45:47 one klogd: New variable MTRRs
Feb 17 23:45:47 one klogd: reg 0, base: 0GB, range: 512MB, type WB
Feb 17 23:45:47 one klogd: reg 1, base: 501MB, range: 1MB, type UC
Feb 17 23:45:47 one klogd: reg 2, base: 502MB, range: 2MB, type UC
Feb 17 23:45:47 one klogd: reg 3, base: 504MB, range: 8MB, type UC
Feb 17 23:45:47 one klogd: x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
Feb 17 23:45:47 one klogd: kernel direct mapping tables up to 1f500000 @ 7000-c000
...
Feb 17 23:45:47 one klogd: vesafb: framebuffer at 0x20000000, mapped to 0xdfd80000, using 1875k, total 7872k
Feb 17 23:45:47 one klogd: vesafb: mode is 800x600x16, linelength=1600, pages=7
Feb 17 23:45:47 one klogd: vesafb: scrolling: redraw
Feb 17 23:45:47 one klogd: vesafb: Truecolor: size=0:5:6:5, shift=0:11:5:0
Feb 17 23:45:47 one klogd: Console: switching to colour frame buffer device 100x37
Feb 17 23:45:47 one klogd: fb0: VESA VGA frame buffer device


-- 
J.A. Magallon <jamagallon()ono!com>     \               Software is like sex:
                                         \         It's better when it's free
Mandriva Linux release 2009.1 (Cooker) for x86_64
Linux 2.6.27.5-desktop-1mnb (gcc 4.3.2 (GCC) #1 Sun Nov
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