Xen users - Mar 2006 - Growing a para-virtualized domain beyond its initial allocation?

This is somewhere between a user and a developer question, depending on 
the answers. My tests were on the latest SuSE drop of xen: 3.0.2_09434-0 
on i386.

I want to start a domain with a small amount of memory, but have the 
potential to give it more if it needs it. (Perhaps after migrating to a 
machine with more memory available.)

A simple "xm mem-set" doesn''t work like I want, Linux never
sees the
memory. Having looked at the balloon driver code, it would seem that 
specifying "mem=256M" on the kernel command line and "memory =
128M" and
"maxmem = 256M" in the config file should do the right things, but in 
practice it doesn''t work. When I try the "xm mem-set 4 256", 
/proc/xen/balloon in the guest reports that I have hit the Xen hard 
limit. (I haven''t yet figured out where this is coming from.)

So, am I on the right track, but there is a bug? Should I be going about 
this another way? Is it hopeless? Assuming this works for 
para-virtualized domains, is there any hope for doing the same with a 
hvm-domain. (I''d guess not, but I''m supposed to ask.)

Thanks,

John Byrne


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