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

[Michael Vrable <mvrable@xxxxxxxxxxx>]

On Tue, Oct 26, 2004 at 09:15:05AM +0100, Peri Hankey wrote:
> I hadn't been thinking of the honeypot scenario myself, but of the plain 
> old 'more virtual computers than you would have thought possible' scene. 
> From Ian's account of it there's less scope for that than I had imagined.
> 
> I can be heavy slow myself ('heavy' is apparently Glaswgian slang for 
> 'very' - think 'heavy light') - especially when immersed in the 
> technical undergrowth.

"Memory Resource Management in VMware ESX Server" by Carl Waldspurger
has some numbers on memory sharing between VMs:
    http://www.usenix.org/events/osdi02/tech/waldspurger/waldspurger.pdf
(This paper is also cited in the Xen SOSP 2003 paper.)

Sharing between identical machines is good, though sharing between
dissimilar machines is not as high as I remembered (copy-on-write
sharing is able to save around 7-30% of memory in real-world testing).

--Michael Vrable


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