Re: why choose 896MB to the start point of ZONE_HIGHMEM
From: Krzysztof Halasa
Date: Wed Apr 07 2010 - 08:25:37 EST
Frank Hu <frank.hu.2001@xxxxxxxxx> 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.
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