linux-kernel - Re: [PATCH] move the kernel to 16MB for NUMA-Q

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Date:	Mon, 11 Jun 2007 22:07:49 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Dave Jones <davej@...hat.com>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...dowen.org>,
	Steve Fox <drfickle@...ibm.com>, Mel Gorman <mel@....ul.ie>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] move the kernel to 16MB for NUMA-Q

On 06/11/2007 08:46 PM, Dave Jones wrote:

> On Mon, Jun 11, 2007 at 08:19:57PM +0200, Jan Engelhardt wrote:
>  > 
>  > On Jun 11 2007 10:36, H. Peter Anvin wrote:
>  > >
>  > >Picking the 16 MB base is a bit obnoxious on small-memory machines, 4 MB
>  > >would probably be a more reasonable base.  Of course, 16 MB would avoid
>  > >the issue of the handful of machines with memory holes at 15-16 MB.
>  > 
>  > How will this work at all with a 5 MB machine?
> 
> Unless you're running with a bunch of CONFIG_EMBEDDED options enabled,
> and a seriously pared down (almost to the point of uselessness)
> userspace, you may have already lost.
> 
> Do such beasts even exist ?  My memories of low-memory x86en I had
> only allowed power of 2 memory sizes.

I have a 386 here that allows 5M, with 4x256K in bank 0 and 4x1M in bank 1 
(it has 16M). 4M, let alone 16, wouldn't work on a 5M machine ofcourse.

But, it's just a default anyway. Would it be considered beneficial to more 
explicitly provide a few options through a config menu, something like the 
attached?

I don't know how to also (cleanly) provide a custom value in addition to the 
choices in Kconfig but maybe more options are not actually considered useful 
anyway?

And perhaps it's not considered useful period. Please just drop on the floor 
if so.

Rene.


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