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

[Paul Archer <tigger@xxxxxx>]

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 haven't played with VCPU's, but it probably works on the same principle.

Paul


Tomorrow, suyash jape wrote:

>   Hi everyone , I have also been facing the same problem for the past few
> days. The max-mem parameter in the domU  config file is completely
> ignored.Even if we specifiy maxmem parameter in the config file at boot time
> , boot time allocated memory is taken as the max memory possible for the
> domain.
>          Also i observed that the max vcpu parameter also behaves the same
> way.
> VCPU Observations:
>  1]We can play around with only the no of VCPUs allotted at boot time or
> less.
>
> Allocating max no of VCPUs  dynamically is not reflected. i.e we can make
> max VCPUs of a domain from 5 to 10 dynamically BUT the 5 new ones are never
> used...they are always paused (possibly a bug in open source xen ?)
>
> Is there a fix around these problems?
>
> Thanks.....
>
> Suyash
>
>
>
> > Paul Archer <tigger@xxxxxx> wrote:
> >
> > > I have been playing with memory= and maxmem=, but I'm not seeing what
> > > I think I should be seeing, namely that the memory available to a
> > > domU can be increased on the fly.
> > >
> > >
> Brad wrote :
> > >I wasn't able to achieve this using xen-3.1. The maximum amount of RAM
> > appears to be dictated by the value that >the machine is booted with. Has
> > anyone else managed to increase the amount of memory allocated to a domU to
> > >more than what the domU was booted with and have the domU utilise this
> > memory? I.e. show up with free -m on the >domU?

--------Brady's First Law of Problem Solving:-------
When confronted by a difficult problem, you can
solve it more easily by reducing it to the question,
"How would the Lone Ranger have handled this?"
----------------------------------------------------

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