linux-kernel - RE: Windows side agrees that lowmem corruption is a problem too

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Message-ID: <SNT125-W5945752E67E4FDA7E5D813C3D60@phx.gbl>
Date:	Tue, 8 Jun 2010 13:49:32 -0700
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<hpa@...or.com>, <linux@...nbow-software.org>
CC:	<mingo@...e.hu>, <linux-kernel@...r.kernel.org>, <gregkh@...e.de>
Subject: RE: Windows side agrees that lowmem corruption is a problem too


> Disusing 64K is something we can do unconditionally (especially since
> we're only talking about 60K -- 15 pages -- of actually usable memory
> anyway.)
Unless you really have no extended memory, agreed.
> Dropping all the low 0.6 MB (which is what it really is) is probably
> unacceptable by default, but perhaps it makes sense to use it only for
> ZONE_DMA or something.
For example, for really old 8-bit ISA devices that can only address 20-bit of address space and do not use the system 8237 DMA controller.
Yuhong Bao 		 	   		  
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