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List:       olpc-linux-mm-cc
Subject:    Re: [linux-mm-cc] [PATCH 0/3] compressed in-memory swapping take5
From:       John McCabe-Dansted <gmatht () gmail ! com>
Date:       2009-06-05 18:06:33
Message-ID: fd87b6160906051106i10b6b82egebe168ddf2a2a9cd () mail ! gmail ! com
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2009/6/5 Nitin Gupta <nitingupta910@gmail.com>:
> On Thu, Jun 4, 2009 at 7:22 PM, John McCabe-Dansted <gmatht@gmail.com> wrote:
>
> It is fundamentally not possible to use 4G memory without PAE - so
> neither can compcache.

Presumably, it would also be possible to use PSE36 in place of PAE, as
with the PSE36 Ram Disk [1] model. I am not sure if this is a
performance win over PAE, [1] says the OS doesn't need to be modified
so it sounds like it should be, but ultimately the real fix is clearly
x86_64. (And we'd have to add our own PSE36 support to the Linux
kernel, at best it sounds like a lot of work for a dying architecture)

[1] http://www.microsoft.com/whdc/system/platform/server/PAE/pae_os.mspx
[2] http://en.wikipedia.org/wiki/PSE-36

-- 
John C. McCabe-Dansted
PhD Student
University of Western Australia
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