Re: [Xen-users] Why limit dom0's memory?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

That said, I think many people find that for a minimal dom0, not doing much 
other work about 256MB is a reasonable amount of memory.  Maybe you'd want to 
go to 512MB if you had many guests and / or memory to spare.  dom0's 
requirements aren't extravagent, as long as you're not running loads of 
things in it (which on a server you shouldn't, for security reasons).

Of course if you start running X and a modern desktop, you can expect dom0 to 
have significantly higher memory requirements, just as a normal machine 
would ;-)

Cheers,
Mark

On Monday 16 June 2008, Sandor W. Sklar wrote:
> On Jun 15, 2008, at 7:37 PM, Tim Post wrote:
> > On Sun, 2008-06-15 at 17:45 -0700, Sandor W. Sklar wrote:
> >> Well, of course, the amount of memory that a dom0 needs depends upon
> >> the service running within it.  I guess I didn't word my question
> >> explicitly enough.  Is there a formula for determine how much
> >> memory a
> >> dom0 might need, given a system with X amount of RAM, and X number of
> >> guests, assuming there are no other services running in the dom0?
> >
> > You are hoping to calculate the best possible density? I.e. give dom-0
> > xx MB per pv guest, xx MB per HVM guest?
>
> Indeed, exactly!  Not exact numbers, but a guideline that would let me
> maximize the memory available to guests without running the risk of
> starving the dom0.
>
> > Even that is too broad to really pin down, it would really depend on
> > what you give the guests and how much they exercise the disks.
>
> OK, thanks, I guess I assumed as much, given that if such information
> existed, Google would have told me.  :-)
>
>       -s-
>
>
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