Re: [Xen-users] extra = "mem=1024" and maxmem

[tgh <tianguanhua@xxxxxxxxxx>]

hi
I am using xen-3.0.3,and I try to set "memory" and "maxmem" following 
your discussion,but it does work as expected
Does it only work in xen-3.0.4 and later version,or what should I do ?

could you help me
Thanks in advance


Jayson Vantuyl 写道:
> There are really three options.
>
>
> 'extra= "mem=1024"' tells the kernel inside of the domain that it only 
> has a 1GB of memory. This is really not the way to do this. Instead 
> use memory=1024.
> "maxmem" tells the hypervisor and the kernel inside of the domain how 
> large it could get. This can be adjusted at any time, but Linux 
> domains don't use it after boot time. The advantage of using this 
> option is that the Linux inside of the domain sizes its internal 
> tables so it can grow to that size. This means that you can 
> dynamically change the amount of memory available inside of the domain.
> For example, if you have these options for a domain:
>
> memory=1024
> maxmem=4096
>
> You will have the kernel boot up with 1GB of memory. At any point you 
> can increase it to, for example, 2 GB with this command:
> xm mem-set <domain> 2048
>
> The kernel will automagically increase to 2GB of RAM. This is, as you 
> might imagine, extremely cool.
> Also, you can always size down a domain below its initial RAM usage to 
> free up memory it is not using, which can be handy on busy or complex 
> production servers.
> On May 15, 2007, at 4:43 AM, Denny Schierz wrote:
>
> > hi,
> >
> > what is the different between the domU config parameter:
> >
> > [...]
> > extra = "mem=1024"
> > [..]
> >
> >
> > and
> >
> > [...]
> > maxmem="1024"
> > [...]
> >
> > is maxmem only available on 3.0.4 and later?
> >
> > cu denny
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx <mailto:Xen-users@xxxxxxxxxxxxxxxxxxx>
> > http://lists.xensource.com/xen-users
>
> --
> Jayson Vantuyl
> Systems Architect
> *Engine Yard <http://www.engineyard.com>*
> jvantuyl@xxxxxxxxxxxxxx <mailto:jvantuyl@xxxxxxxxxxxxxx>
>
>
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>
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