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[Xen-devel] Why does xc_domain_getinfolist() think 256 == 244?

from [Tim Post]

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Subject:	[Xen-devel] Why does xc_domain_getinfolist() think 256 == 244?
From:	Tim Post <echo@xxxxxxxxxxxx>
Date:	Wed, 13 May 2009 17:35:50 +0800
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Hi,

I am using xc_domain_getinfolist() on x86_32 and have noticed something
rather odd.

If a dom-u is allocated 256 MB , xc.curmem thinks its 244.

We take curmem, and divide it by (1024 * 1024). Any other multiple of 1,
2, 4, 8 (and more) is accurate .. however if curmem == 256, we've lost
12 * (1024 * 1024).

To reproduce, start 3 mini-os guests with 256 MB of ram, use
xc_domain_getinfolist() and see what it says :) I'm working with the
current tip of xen-unstable.

Yet, xm list reports the memory accurately.

I'm puzzled.

Regards,
--Tim






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