Date: Tue, 10 Jan 2006 08:43:33 -0500 (EST)
From: Byron Stanoszek <gandalf@winds.org>
To: Jens Axboe <axboe@suse.de>
cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>
Subject: Re: 2G memory split
In-Reply-To: <20060110133728.GB3389@suse.de>
Message-ID: <Pine.LNX.4.63.0601100840400.9511@winds.org>
References: <20060110125852.GA3389@suse.de> <20060110132957.GA28666@elte.hu>
 <20060110133728.GB3389@suse.de>
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On Tue, 10 Jan 2006, Jens Axboe wrote:

>> yes, i made it totally configurable in 2.4 days: 1:3, 2/2 and 3:1 splits
>> were possible. It was a larger patch to enable all this across x86, but
>> the Kconfig portion was removed a bit later because people _frequently_
>> misconfigured their kernels and then complained about the results.
>
> How is this different than all other sorts of misconfigurations? As far
> as I can tell, the biggest "problem" for some is if they depend on some
> binary module that will of course break with a different page offset.
>
> For simplicity, I didn't add more than the 2/2 split, where we could add
> even a 3/1 kernel/user or a 0.5/3.5 (I think sles8 had this).

I prefer setting __PAGE_OFFSET to (0x78000000) on machines with 2GB of RAM.
This seems to let the kernel use the full 2GB of memory, rather than just
1920-1984 MB (at least back in 2.4 days).

  -Byron

--
Byron Stanoszek                         Ph: (330) 644-3059
Systems Programmer                      Fax: (330) 644-8110
Commercial Timesharing Inc.             Email: byron@comtime.com
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