Re: [Xen-users] Xen inconsistency: what is the memory size of domU?

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Fri, 2013-08-09 at 20:37 -0400, Guanglin Xu wrote:
> Hi all,
> 
> The results reporting the memory size of domU seem inconsistency .
> 
> For example, in my domU settings with 1 GB memory (8MB of them are
> taken as VGA memory) where we don't need to concern balloon and PCI &
> MMIO holes, I get 4 different reports.
> 
> libxc: xc_domain_getinfo()
> (1) info.nr_pages == domctl.u.getdomaininfo.tot_pages == 261113 == 1019.9 MB
> (2) info.max_memkb == domctl.u.getdomaininfo.max_pages <<
> (PAGE_SHIFT-10) == 1049600 KB = 1025 MB ( >1 GB ! )
> 
> libxl: libxlDomainGetInfo()
> (3) info->memory = d_info.current_memkb = 1044452 KB == 1019.9 MB
> (4) info->maxMem = d_info.max_memkb = 1049600 KB == 1025 MB
> 
> (5) domU (winxpsp2) reports physical memory 1039916KB == 1015.5 MB
> (6) 1 GB = 1024 MB
> 
> Is any know the reason?

You might find docs/misc/libxl_memory.txt useful?

>  and what is exact the memory size?

info.nr_pages I think is the actual use at the point at which the state
snapshot was taken, but it will vary as PV drivers do their thing etc.

Ian.


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