Re: why swap at all?

[William Lee Irwin III]

Quote from William Lee Irwin III <wli@xxxxxxxxxxxxxx>:
>> So you can move userspace pages out of ZONE_DMA as-needed.

On Tue, Jun 01, 2004 at 09:50:08AM +0100, John Bradford wrote:
> But how does that improve performance before untouched RAM, (496788 in this
> example), is exhausted?
> In normal use, (almost always CPU bound), I've honestly never noticed any
> performance gain from having swap configured.  I must admit I haven't put
> a lot of effort recently in to looking at this, but I have never been able
> to reproduce these 'swap increases performance even with untouched RAM'
> claims.

Because ZONE_DMA, the lower 16MB is not all of RAM.


-- wli
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