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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2012-11-20 at 17:30 +0000, Alexandre Kouznetsov wrote:
> 
> I have attached the complete dmesg for a better reference. This one is
> after I changed from "mem=8G" to "mem=8192M". 

It's interesting that it has both:
        [    0.000000] BIOS-provided physical RAM map:
        [    0.000000]  Xen: 0000000000000000 - 00000000000a0000 (usable)
        [    0.000000]  Xen: 00000000000a0000 - 0000000000100000 (reserved)
        [    0.000000]  Xen: 0000000000100000 - 0000000010000000 (usable)

and
        [    0.000000] user-defined physical RAM map:
        [    0.000000]  user: 0000000000000000 - 00000000000a0000 (usable)
        [    0.000000]  user: 00000000000a0000 - 0000000000100000 (reserved)
        [    0.000000]  user: 0000000000100000 - 0000000010000000 (usable)
        
Where I think the second one is the result of passing mem=, yet it is
exactly the same! I suspect it has taken the command line provided limit
and clamped it...

Another thing you could try is using the memmap command line option to
generate a memmap like those above but with the limit on the 3rd one ==
8G. You'll have to read Documentation/kernel-parameters.txt to figure
out exactly how though since I'm not sure how that stuff works.

Another workaround would be to boot with 8G and then balloon down ASAP.
This means you need the spare RAM available to boot the guest though,
which isn't ideal...

Ian.



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