Messages in this thread | | | Date | Tue, 1 Jun 2004 01:54:56 -0700 | From | William Lee Irwin III <> | Subject | Re: why swap at all? |
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Quote from William Lee Irwin III <wli@holomorphy.com>: >> 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.
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