Re: [Xen-users] Memory problems persist... Cannot allocate memory

[James Pifer <jep@xxxxxxxxxxxxxxxx>]

On Sat, 2010-01-02 at 02:28 +0200, Pasi KÃrkkÃinen wrote:
> On Fri, Jan 01, 2010 at 10:51:48PM +0200, Pasi KÃrkkÃinen wrote:
> > On Fri, Jan 01, 2010 at 03:06:03PM -0500, James Pifer wrote:
> > > > You really need to start monitoring the server/dom0 in more detail.
> > > > 
> > > > Are you using file: backend for domU disks, or tap:aio: ?
> > > > 
> > > > -- Pasi
> > > 
> > > The domUs are all using file based storage. The memory did not fill up
> > > until I started the domUs. 
> > 
> > Yes, exactly. When you start using file: backed domUs, then the dom0
> > Linux kernel will start caching the guest disk accesses into the memory.
> > 
> > This is completely normal, and it's exactly what should happen. 
> > 
> > Like said, dom0 Linux kernel will use as much memory for caching as
> > there's available to dom0 - so caching is not a reason to increase dom0 
> > memory. 
> > 2048 MB definitely is enough for dom0.
> >
> 
> Just for reference, back in the Xen 2.0 days I used to have 192 MB of
> RAM for dom0.. and that was enough.
> 
> Nowadays I usually give dom0 512 MB of RAM, or in bigger machines 1024 MB.
> That is usually enough for a Xen-only server machine (without any local 
> desktop/X use).
> 
> So.. you need to make sure there's nothing leaking memory in dom0. 
> Xen management tools will obviously require some available memory in dom0 
> to work correctly.
> 
> -- Pasi
> 

Thanks for all the help. I will just have to monitor it. Nothing ever
runs (at least started by me and I'm the only one ever on these boxes)
except for virt-manager. 

Let you know if I see anything!!

James


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