Re: Memory under KVM?

[Avi Kivity <avi@redhat.com>]

On 12/13/2009 07:16 PM, Thomas Fjellstrom wrote:
>
>> Linux usually keeps very little RAM free (it's kept as cache).  So there
>> has to be some action on the part of the host to get the guest to free
>> things.  For Windows guests you can use ksm to reclaim free memory
>> (since Windows will zero it).
>>
>>      
> I'm waiting for 2.6.32 to hit Debian Sid before I start playing with ksm (I
> don't think its in 2.6.31).
>
> The problem is it should be automatic. The balloon driver itself or some
> other mechanism should be capable of noticing when it can free up a bunch of
> guest memory. I can't be bothered to manually sit around and monitor memory
> usage on my host so I can then go into virt-manager to reduce memory to each
> guest.
>    

That should be pretty easy though it will have an effect on guest 
performance.

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