Re: [Xen-users] memory=x & maxmem=y

[Brad Plant <bplant@xxxxxxxxxxxx>]

On Tue, 22 May 2007 13:26:09 +1000
Brad Plant <bplant@xxxxxxxxxxxx> wrote:

> On Mon, 21 May 2007 21:56:22 -0500 (CDT)
> Paul Archer <tigger@xxxxxx> wrote:
> 
> > After doing some more research, I finally found out what's going on.
> > In order to allocate more memory to a domU, it has to be freed from
> > somewhere else first. In other words, if memory=256 and maxmem=512,
> > then before you run 'xm mem-set mydomU 512', you have to run 'xm
> > mem-set 0 <current memory for dom0 - 256>'.
> > I suppose this would work just as well by taking the memory from
> > another domU (or some combination of domU's and dom0), but I haven't
> > tried that.
> 
> I don't think this is the issue here since the dom0 memory usage will
> balloon down automatically to free up more RAM for the domU. When I
> attempted to get this to work yesterday, dom0 had over 2GB of RAM
> allocated to it, so it had heaps to spare when it ballooned down.
> 
> The problem isn't with trying to allocate memory to a domU, it is
> with trying to get domU to use or recognise the extra memory. I was
> able to allocate the extra memory ok, but running free -m in the domU
> would not show the extra memory as being available.

Sorry Paul, you were right. It seems that dom0 didn't automatically balloon 
down to free up the extra ram. I am now passing the dom0_mem variable to the 
hypervisor so that I don't have to worry about reducing its usage first.

Cheers,

Brad

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