[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] Growing a para-virtualized domain beyond its initial allocation?



John Byrne wrote:


I didn't get any responses on xen-users, so I'll try xen-devel:

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.)

You ought to be able to set:

memory=128
maxmem=256

In a domain configuration file. I was poking around with the maxmem option the other day and noticed that it wasn't being transmitted in xm create (or it at least appeared that way). I was in the process of hunting down another bug so I didn't look too much into it. If the above doesn't give you your desired behavior, you should open a bug in bugzilla about it.

Regards,

Anthony Liguori

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



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.