RE: Xen runs out of memory! - succeeds now

["Jayaraman, Bhaskar" <Bhaskar.Jayaraman@lsi.com>]

Thanks Keir, reducing Dom0 memory usage alone helps but I'm not able to figure how. This is why: -

Case 1: - 

I have 8GB of memory in the system and Dom0 was initially using 2.5 GB. I brought up a DomU that came up with 4GB memory which still leaves out 1.5GB free and still I wasn't able to setup the 1536 grant table pages which I wished to.

Case 2: -

Next I reduce Dom0 usage to 800MB and then bring up DomU with 3GB (~4.5GB free) of memory and I am able to setup 1536 pages ----> This is great

Next I bring up another DomU with 3GB memory (~1.5GB free now) and once again I'm able to setup 1536 grant table pages ----> Even better.

I'm don't know why case 1 with 1.5GB memory free on the system, 1536 grant table pages weren't setup with just one domU, while in the 2nd case, with again ~ 1.5GB free I'm able to setup the grant table on the second domU?


Regards,
Bhaskar.

-----Original Message-----
From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
Sent: Thursday, March 12, 2009 4:50 PM
To: Jayaraman, Bhaskar; xen-devel@lists.xensource.com
Subject: Re: [Xen-devel] Xen runs out of memory!

On 12/03/2009 11:01, "Jayaraman, Bhaskar" <Bhaskar.Jayaraman@lsi.com> wrote:

> Do you think I can increase contiguous pages by increasing the value of
> MAX_ORDER, which is right now defined as
> #define MAX_ORDER 20 /* 2^20 contiguous pages */
> 
> Which is a hell of a lot of pages and all I'm asking for are 1536 contiguous
> ones.

You're not needing contiguous memory. You're simply out of memory. Not much
Xen can do about that. Your domains are using it all.

 -- Keir