Re: [PATCH] trim memory not covered by WB MTRRs

[Jesse Barnes <jesse.barnes@intel.com>]

On Wednesday, June 6, 2007 3:57 pm Justin Piszcz wrote:
> On Wed, 6 Jun 2007, Jesse Barnes wrote:
> > On Wednesday, June 6, 2007 3:26 pm Justin Piszcz wrote:
> >> Nope, I booted with only netconsole= options.  I have a lot of HW
> >> in the box and I guess the buffer is too small.  Not sure where to
> >> change it in the kernel.  Looking..
> >
> > It's called "kernel log buffer size" and it's in "General setup".
> >
> > Jesse
>
> Did the dmesg output get you what you needed?  Why the few KB
> difference?
>
> :)

Yeah, looked at your e820 and your MTRR settings and I think my patch is 
doing the right thing (i.e. trimming just the right amount of memory, 
leaving you with as much as possible).

The mem= approach though looks slightly off, but I haven't looked at 
x86_64's mem= handling to see why.  From a high level though, adjusting 
end_pfn is the right thing to do, since theoretically mem= could choose 
to make holes in your low memory and keep your high memory in the 
allocation pools (though it's not generally implemented this way).

Jesse