Re: [Xen-users] dynamic memory extension not working on Debian Squeeze

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2012-11-15 at 19:59 +0000, Peter Viskup wrote:

In dmesg.2012-11-15.log I see:
[    0.000000]  Xen: 0000000000000000 - 00000000000a0000 (usable)
[    0.000000]  Xen: 00000000000a0000 - 0000000000100000 (reserved)
[    0.000000]  Xen: 0000000000100000 - 0000000010000000 (usable)

which indicates that the maximum RAM size the kernel can cope with is
0x10000000 == 256M, which matches your experience.

I suspect that if you mem-set to e.g. 128M then you could increase back
to 256M successfully.

What is missing is booting "pre-ballooned" e.g. with a maximum memory
size of 1G but only using 256M on boot.

You have memmax='4092' in your guest config, which should work with a
modern toolstack/kernel (BTW why 4092 not 4096?).

I'm a little bit rusty on the details but older kernels and/or toolstack
needed a little more manual intervention. Can you try adding
"mem=4G" (or 4092M to match your config) to your domU command-line?

Ian.


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