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SubjectRe: highmem question
war wrote:

> I have 1GB of ram + HIGHMEM support on.
>
> How much of a performance impact are we talking about?
>
> 896MB of ram would be ok if HIGHMEM impacted the machine severely.
>
> Has anyone done any benchmarks with HIGHMEM vs NO HIGHMEM?
>


1 GB is really the worst case. You don't gain too much memory this way,
and suffer the necessary slowdown.

Personally I would support dropping the kernel boundary to 0xb8000000
and use 0xb8000000-0xbfffffff for iomem; that way 1 GB wouldn't need
HIGHMEM.

-hpa


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