Subject: Re: i686 SMP systems with more then 12 GB ram with 2.4.x kernel ?
To: bcrl@redhat.com (Benjamin LaHaise)
Date: Sun, 6 Jan 2002 16:16:07 +0000 (GMT)
Cc: gerrit@us.ibm.com (Gerrit Huizenga), alan@lxorguk.ukuu.org.uk (Alan Cox),
        znmeb@aracnet.com (M. Edward Borasky),
        harald.holzer@eunet.at (Harald Holzer), linux-kernel@vger.kernel.org
In-Reply-To: <20020106032030.A27926@redhat.com> from "Benjamin LaHaise" at Jan 06, 2002 03:20:30 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Sender: linux-kernel-owner@vger.kernel.org

> up as a 5% performance loss on normal loads, and this would make it 
> worse.  We're probably better off implementing PSE.  Of course, making 
> these kinds of choices is hard without actual statistics of the 
> usage patterns we're targetting.

You don't neccessarily need PSE. Migrating to an option to support > 4K
_virtual_ page size is more flexible for x86, although it would need 
glibc getpagesize() fixing I think, and might mean a few apps wouldnt
run in that configuration.

Alan
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