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RE: [Xen-devel] xen balloon issue?

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Subject: RE: [Xen-devel] xen balloon issue?
From: "Robbie Garertt" <rgarrett@xxxxxxxxxxxxxx>
Date: Tue, 16 Mar 2010 11:54:48 -0400
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Thread-topic: [Xen-devel] xen balloon issue?
I have tried on the users list, no one has responded (and i do understand that no one is expected to respond).
I do see a total memory difference between the kernels.


From: Jan Beulich [mailto:JBeulich@xxxxxxxxxx]
Sent: Tue 3/16/2010 11:52 AM
To: Robbie Garertt
Cc: Xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] xen balloon issue?

>>> "Robbie Garertt" <rgarrett@xxxxxxxxxxxxxx> 16.03.10 15:46 >>>
>I know this may not be the correct place here and hopefully I will not get flamed for this but I am searching for an answer to my problem and I think it may be a bug?

xen-users would likely be the better place to ask questions like this.

>I have a xen server setup and running version 3.4.2. Kernel version is
>My issue here is that when I do a free -m within the Vm is shows less, some times more ram then what the config files shows.   Here is an example of what I see from xend starting the domU.
>[2010-03-14 17:09:45 2598] DEBUG (balloon:166) Balloon: 7766704 KiB free; need 526336; done.
>526336 /1024 = 514MB
>When I do a free -m within the domU I get it showing me a total of 506mb.
>when I do cat /proc/meminfo is shows a total of 518220 which is 506mb.

>It would appear that for what ever reason my system is off by 19MB when it comes to 512mb, and 28mb per gb.   I had to set my testing.cfg file to 531MB to get free -m to show 512mb of total memory inside a domU and 1052 to get it to so show 1024.

>can anyone provide any insight as to why or where i may go in an attempt to get this solved?  20mb adds up to a lot when you run several domu's

Just compare with what you get on native: If you have 8Gb in the machine, you won't be shown a total of 8192Mb either. Linux is not precise in this respect.


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