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

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Message-ID: <4BBB972B.1030600@zytor.com>
Date:	Tue, 06 Apr 2010 13:18:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Frank Hu <frank.hu.2001@...il.com>
CC:	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

On 04/06/2010 01:15 PM, Frank Hu wrote:
> 
> 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.
> 
> I am not a guru in this space... so I might be wrong.

And you are.  The vmalloc zone (not DMA zone -- that's something
entirely different) is configurable via the vmalloc= kernel command line
option.

	-hpa
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