Talk:Physical Address Extension: Difference between revisions

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	== As to the PAE kernel for Linux ==

	That is a long and old news that even though the processors, x86 or IA-32, lack support of PAE, could also be equipped with PAE kernel. As to the further information, one could retrieve such information from Linux kernel source, from http://www.kernel.org. <!-- Template:Unsigned IP --><small class="autosigned">— Preceding ] comment added by ] (]) 00:42, 9 May 2017 (UTC)</small> <!--Autosigned by SineBot-->

	:The only kernels that can run on a processor without PAE support are 1) kernels without PAE support and 2) kernels that check whether the hardware supports PAE, enables it if and only if present, ''and'', depending on whether PAE is enabled or not, use different code to manage page table entries.

	:If you look at the Linux kernel source, in {{mono\|arch/x86/include/asm/pgtable_32_types.h}}, you'll see a comment

	/*
	* The Linux x86 paging architecture is 'compile-time dual-mode', it
	* implements both the traditional 2-level x86 page tables and the
	* newer 3-level PAE-mode page tables.
	*/

	:and, in fact, whether the kernel uses pre-PAE or PAE page tables on 32-bit x86 processors is set at compile time, ''not'' determined at run time, so a kernel with PAE support will work only on a machine that supports PAE; a kernel without PAE support will work on a machine that supports PAE, but it won't use PAE and will only handle 4GB of physical memory.

	:So, no, you can't run a PAE kernel on a processor that lacks PAE support; anybody who believes that it does either hasn't read the Linux kernel source or read it but didn't understand it. ] (]) 03:34, 9 May 2017 (UTC)

	:: yeah, you are definitely correct! <!-- Template:Unsigned IP --><small class="autosigned">— Preceding ] comment added by ] (]) 12:50, 9 May 2017 (UTC)</small> <!--Autosigned by SineBot-->

	{{Done}}

	== 32 bit Windows specific ==		== 32 bit Windows specific ==

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32 bit Windows specific

If the Microsoft Windows discussed is specific to 32 bit, then it would be more clearer to put them in the header. As many people who reads the page for quick reference may miss this detail.

Tsenapathy (talk) 17:40, 29 November 2018 (UTC)

PAE is a processor feature. Information about support in specific OSs (Windows or otherwise) therefore does not belong in the article header. The processor feature would exist even if no OSs supported it. Jeh (talk) 17:59, 29 November 2018 (UTC)

PAE Xeon only

It should be made clear the only IA-32 processor which supported Physical Address Extension as defined by Intel was Xeon. PAE requires BOTH 36 address registers AND 36bit data bus for RAM.

All IA-32 processors had at most a 32bit data bus. 36 address registers only allows paging - it is not PAE support.

Only Xeon had 36bits for RAM. (2x 16bit banks + 4bit segment selector). (Xeon was technically a 36bit CPU).

Onzite. (talk) 23:25, 10 May 2020 (UTC)

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