linux-kernel - Re: x86 git tree broken (bisected)

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Date:	Mon, 14 Apr 2008 11:08:09 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Pavel Machek" <pavel@....cz>,
	"Thomas Gleixner" <tglx@...utronix.de>, "H. Anvin" <hpa@...or.com>,
	"Arjan van de Ven" <arjan@...radead.org>
Subject: Re: x86 git tree broken (bisected)

On Mon, Apr 14, 2008 at 2:16 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
>  * Yinghai Lu <yhlu.kernel@...il.com> wrote:
>
>
> > >  Attached is dmesg output from current x86.git with
>  > >  debug_gart_checking.patch applied.
>  >
>  > please test the final one ... ...
>  >
>  > You should get back 64M memory back.
>
>  so basically with all the right patches applied, and GART set to 32MB in
>  the BIOS, Rafael should have more free RAM on his system than ever
>  before :-)

Yes

>
>  i've put all the patches into x86.git/latest (it's all uploaded already
>  as well), so that should give Rafael a one-stop shop to test it out. [i
>  have not applied the debug patch that changes the aperture test from
>  32MB to 64MB, and it should be unnecessary as well]
>
>  btw., Yinghai, should we perhaps add a WARN_ON() to those places where
>  we waste RAM (such as the "This costs you 64 MB of RAM" message) - so
>  that kerneloops.org can pick those warnings up? Maybe there are other
>  situations where we waste RAM, and people dont realize it.

in Rafael case, just need to ask user to increase GART size in BIOS if
more than 4G RAM installed ( or 4G installed with hardware memhole
remapping enabled).

if less than 4G installed, just take the BIOS setting with 32M

YH
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