Re: [Xen-devel] Copy-on-write memory to allow many more xenU domains per machine

["Ronald G. Minnich" <rminnich@xxxxxxxx>]

On Mon, 25 Oct 2004, David Hopwood wrote:

> I thought the idea would be to have a 'clone' primitive that would work
> in a similar way to Unix fork? The clone would start off sharing all
> pages, although a lot of them would get copied fairly quickly. Does


yes but ... if most or almost most pages get copied, COW is a loss. Try to 
find that old paper somebody wrote about "bovaphobic" behaviour -- 
interesting numbers in there. 

COW is not always a good thing.

ron


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