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Re: [Xen-users] xen dom0 not reclaiming free'd memory

Can you try testing your hypothesis? 
Try starting a large process (say a JVM) on your Dom0 and then finish it. Do you see freed memory?

If you don't it means that your mental model of the Linux memory model is oversimplified. When a Linux process ends some of it's pages will have been shared and will remain in use, other memory will be used for the buffer cache. I'm not sure whether Linux has an equivalent to the solaris free list where freed pages will remain intact as a performance optimization in case they are needed again .

Regardless, memory allocation is a subtle, complex, misunderstood, nonintuitive, nonlinear craft.

Sent from my iPhone

On Jul 9, 2009, at 8:51 PM, John Calderon <jcalderon@xxxxxxxxxxxxxxx> wrote:

Hello:

I have situation with xen 3.2.1 kernel 2.6.26-2 where when I shutdown a VM neither the OS or dom0 sees the free'd memory.

I've searched around and dont see anything related.  Am I missing some config option or something? my /etc/xen/xend-config.sxp is set to
(dom0-min-mem 196)



Regards,


John Calderon

IODA, Sr Systems Admin

539 Bryant Street, Suite 303

San Francisco, CA   94107

office: 415.375.3250

jcalderon@xxxxxxxxxxxxxxx

www.iodalliance.com




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jer jer wrote:
Hi everybody,

I'm very interested in some features promised in xen 3.4.
One of them is the support for PV USB.

So, I've installed/compiled/installed a xen 3.4 (testing) hypervisor and then I've launched a PV domU (using pygrub).
But all my google searches were useless to find any piece of info on how to enable and test this functionnality.

Is this really implemented? If yes, has somebody ever succeeded to use it.

Basically, I'd like to boot my domU then plug a USB stick and mount it on domU.

If I understand well, this should not need any passthrough operation. So I imagine that a specific line must be added on domU's configuration file.


Any help appreciated!

Have a nice day.

Jérémie

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