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From
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SubjectRe: Linux Status For 2.3.x: v 2.3.43
Hi,

On Fri, 11 Feb 2000 13:35:18 +0100 (CET), Ingo Molnar
<mingo@chiara.csoma.elte.hu> said:

>> Page cache high on PAE36 boxes is very slow, maybe disable ?

> This is new to me - pagecache in highmem is just as fast here as in
> lowmem (as far as dbench numbers go). If there is any problem i'd like
> to hear about it.

Here too --- actual IO performance is not measurably difference. Doing
disk IO to highmem page cache pages is going to use a little more CPU
time due to the necessary bounce buffer copying, but I can't see a
measurable difference on page cache performance with highmem enabled
compared to using low memory on PAE36.

--Stephen

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