[Xen-devel] Re: Linux 2.6 guest BUG().

[Matt Ayres <matta@xxxxxxxxxxxx>]

Keir Fraser wrote:
> On 1 Feb 2006, at 16:08, Matt Ayres wrote:
>
> > I assume you mean Xen's memory usage. I am showing 141MB free out of 
> > 8112MB total.  Our scripts to add accounts don't allow adding more 
> > accounts then there is memory for, we actually leave about 128MB as a 
> > buffer.
> That's a bit odd then. If you don't explicitly specify dom0's memory 
> allocation at boot time then you should end up with 128MB 'slack' left 
> unallocated. And that should all be <4GB.
> If you are giving dom0 all of memory on boot, and then reducing it 
> later, that could be a problem (dom0 may end up giving back only memory 
>  >4GB).
I am allocating 256MB of RAM to dom0.  I am running Fedora Core 4.  On 
this particular server I am running httpd/mysqld on the host with a fair 
amount of activity to it, but I have extended swap space to 1GB and 
tuned both apps for low memory usage.  The memory is set statically via 
kernel line in grub.  (dom0-min-mem 262144) is set in xend-config.sxp to 
ensure it keeps the memory allocated to it.
Thank you,
Matt Ayres

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