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Date: 18 Sep 2006 19:22:52 +0200 From: Andi Kleen <ak@...e.de> To: Helge Hafting <helge.hafting@...el.hist.no> Cc: linux-kernel <linux-kernel@...r.kernel.org>, yogyas@...il.com Subject: Re: How much kernel memory is in 64-bit OS ? Helge Hafting <helge.hafting@...el.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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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