linux-kernel - Re: why choose 896MB to the start point of ZONE

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Message-ID: <m34ojn8nl0.fsf@intrepid.localdomain>
Date:	Wed, 07 Apr 2010 14:16:27 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Frank Hu <frank.hu.2001@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Joel Fernandes <agnel.joel@...il.com>,
	hayfeng Lee <teklife.kernel@...il.com>,
	linux-kernel@...r.kernel.org, linux-kernel@...kernel.org,
	kernelnewbies@...linux.org
Subject: Re: why choose 896MB to the start point of ZONE_HIGHMEM

Frank Hu <frank.hu.2001@...il.com> writes:

> thought that you can only configure how to split the VM like 1G/3G or
> 2G/2G. But the DMA zone size, the 128MB space for I/O is not
> configurable. The NORMAL zone size will be deducted based on the VM
> Split and some hard coded DMA zone and 128 MB space size.

Only the DMA zone size if fixed - a hardware property of PC/AT-style DMA
controllers and ISA bus.
-- 
Krzysztof Halasa
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