Re: [Xen-users] very strange problem: memory memory?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sat, 2014-11-15 at 00:26 +0100, lee wrote:
> Hi,
> 
> does xen, or do domUs, somehow remember how much memory they had
> assigned to them?
> 
> I've upgraded the memory of the server from 8GB to 36GB (8x4 + 4*1 GB),
> following the instructions in the manual about how to populate the
> banks.  So far, the server is running fine.
> 
> I have a VM which used to have 'memory = 3107' in its configuration.
> When I change the number to 10240 or 8192 or 4096 or even 3110, the VM
> crashes early during the boot process.  Change it back to 3107 and the
> VM runs fine.
> 
> There are other domUs that crash when they are booting when I change the
> amount of memory assigned to them, like from 384MB to 512MB.  Change it
> back to 384MB and the VM runs fine.  Only for two or three VMs, I was
> able to increase the memory.
> 
> Dom0 and all domUs are running Debian Wheezy.
> 
> 
> Any idea what's going on here?  Am I doing something wrong?
> 
> The only thing that comes to mind is that for some reason, there's a
> strange problem with RAM modules of different sizes.  But if that's the
> case, why is the server (IBM x3650 l2g) running fine?

Have you run memtest or something similar? It may be that some memory is
not used until you start a VM, because it is just in the free pool.

Ian.


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