linux-kernel - Re: [PATCH 2/2] x86: mtrr_cleanup try gran

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Date:	Fri, 3 Oct 2008 09:41:37 +0200
From:	"J.A. Magallón" <jamagallon@....com>
To:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86: mtrr_cleanup try gran_size to less than 1M

On Fri, 3 Oct 2008 09:37:27 +0200, Ingo Molnar <mingo@...e.hu> wrote:

> 
> * J.A. Magallón <jamagallon@....com> wrote:
> 
> > Also, on a 64 bit box with 4Gb, it gives this:
> > 
> > cicely:~# cat /proc/mtrr
> > reg00: base=0x00000000 (   0MB), size=4096MB: write-back, count=1
> > reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
> > reg02: base=0x140000000 (5120MB), size= 512MB: write-back, count=1
> > reg03: base=0x160000000 (5632MB), size= 256MB: write-back, count=1
> > reg04: base=0x80000000 (2048MB), size=2048MB: uncachable, count=1
> > 
> > Patch below cleans up formatting, with space for big bases and sizes (64 Gb).
> 
> applied to tip/x86/mtrr, thanks!
> 
> > +++ arch/x86/kernel/cpu/mtrr/if.c     2008-10-03 00:22:34.000000000 +0200
> > @@ -16,7 +16,7 @@
> >  static const char *const mtrr_strings[MTRR_NUM_TYPES] =
> >  {
> >      "uncachable",               /* 0 */
> > -    "write-combining",          /* 1 */
> > +    "write-combine",            /* 1 */
> 
> hm, maybe this bit could confuse versions of Xorg that modifies 
> /proc/mtrr - i.e. this could be part of the ABI towards user-space. 
> We'll see.
> 
> 	Ingo

Oops, it's not only used for messages, also for writes in /proc !!!

Forget this part.

-- 
J.A. Magallon <jamagallon()ono!com>     \               Software is like sex:
                                         \         It's better when it's free
Mandriva Linux release 2009.0 (Cooker) for i586
Linux 2.6.25-jam18 (gcc 4.3.1 20080626 (GCC) #1 SMP
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