Re: [Xen-devel] can not use all available memory

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-11-23 at 12:28 +0000, Pasi KÃrkkÃinen wrote:
> On Fri, Nov 23, 2012 at 12:21:32PM +0000, Ian Campbell wrote:
> > This question belongs on xen-users.
> > 
> > On Fri, 2012-11-23 at 11:35 +0000, Alexander Bienzeisler wrote:
> > > Hello,
> > > 
> > > i just tried to add a domU with 16 gigs of ram (maxmem = 16384, memory = 
> > > 16384) with free_memory : 28969 but got an error:
> > > 
> > > libxl: error: libxl.c:3433:libxl_set_memory_target: new target 0 for 
> > > dom0 is below the minimum threshold
> > 
> > The clue is in this message -- you cannot safely balloon down a guest
> > (including dom0) to an arbitrarily small value relative to its initial
> > size. The kernel will have certain fixed datastructures etc which are
> > sized according to the maximum amount of RAM at start of day.
> > 
> > If you were to balloon down too low then you would run out of RAM and
> > the OOM killer would step in and start killing stuff, so xl includes a
> > safety catch which prevents this.
> > 
> > If you have a huge host and want a small dom0 use the dom0_mem option
> > and disable xl's autoballoon option or whatever the equivalent xend
> > option is.
> > 
> 
> I think he was already using dom0_mem. He had 28969 free in Xen as
> reported by "xl info".

Then he's missed disabling autoballoon.

> 
> -- Pasi
> 



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