Re: [Xen-users] memory issue on paravirtualized xen kernel

[Steve Allison <xen-users@xxxxxxxxxxxxxxxxxx>]

On 27/06/2011 01:20, Jingyun He wrote:
> Hi, All
> Today I downloaded the 2.6.37 Paravirtualized Kernel 32-bit for Xen
> from http://www.stacklet.com, and installed it into domU,
> After booting up the domU, I noticed the the memory inside the domU is
> less than allocated memory.
> e.g. I assigned 256M memory to the domU, but inside the domU, it only
> has 244MB memory
> [root@localhost ~]# free -m
>               total       used       free     shared    buffers     cached
> Mem:           244         35        209          0          2         19
> -/+ buffers/cache:         13        231
> Swap:            0          0          0
>
> Any idea?
>
> Thanks.
>
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I also noticed this change going from Debian Lenny (2.6.26) to Debian 
Squeeze (2.6.32) ...
It is affected by whether I used PyGrub or not. Without PyGrub the 
memory in the domU was correct, at 256M.
After some investigation however it seems that some reserved memory 
moves from the "used" column and instead diminishes the "total" column.
For example.....
   2.6.32 with PyGrub gave me 244M total RAM, with 15M used, 229M 
available.
   2.6.32 without PyGrub gave me 256M total RAM, with 27M used, 229M 
available.
.....so it didn't make any difference in the end.

I guess some reserved memory gets allocated differently?

--
May the ping be with you ..


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