From: Andi Kleen <ak@suse.de>
To: Helge Hafting <helge.hafting@aitel.hist.no>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, yogyas@gmail.com
Subject: Re: How much kernel memory is in 64-bit OS ?
Date: 18 Sep 2006 19:22:52 +0200 [thread overview]
Message-ID: <p7364fl3x8z.fsf@verdi.suse.de> (raw)
In-Reply-To: <450EA198.5060302@aitel.hist.no>
Helge Hafting <helge.hafting@aitel.hist.no> writes:
> The requirement for using a 4G/4G split is to have a processor
> that support 64-bit adressing as well as 32-bit backward compatibility.
s/64/36/. But it's actually not true: 4/4 works on 32bit phys non PAE
system too (iirc Fedora forced it for some time even on unsuspecting
P-M/VIA C3/586 users who only do 32bit).
> > 2) how it is managed ?
> The kernel runs in 64-bit mode, offering the 4G/4G stuff for 32-bit
> processes.
No.
>
> > 3) how HIGH_MEMORY concept is related here.
> high memory is a quirky way of supporting more than 4G on a 32-bit
More than ~900MB with a default split.
-Andi
prev parent reply other threads:[~2006-09-18 17:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-16 11:34 How much kernel memory is in 64-bit OS ? yogeshwar sonawane
2006-09-18 0:10 ` Rik van Riel
2006-09-18 8:31 ` Andi Kleen
2006-09-18 8:35 ` Jan Engelhardt
2006-09-18 12:30 ` Rik van Riel
2006-09-18 12:34 ` Jan Engelhardt
2006-09-18 13:30 ` Kyle Moffett
2006-09-18 9:51 ` yogeshwar sonawane
2006-09-18 13:39 ` Helge Hafting
2006-09-18 17:22 ` Andi Kleen [this message]
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