Re: Memory under KVM?

[Avi Kivity <avi@redhat.com>]

On 12/16/2009 01:21 AM, Thomas Fjellstrom wrote:
>
>>> 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.
>>
>>      
> As long as its only done after an appropriately long idle period (ie: theres
> been X MB's free for a long time, give it back), I can't see it harming
> performance too much. At least not more than setting ram too low when
> manually (de)ballooning memory.
>    

It depends on what your expectations are.  If you have a lot of memory 
you might be surprised when you access an idle guest and have to wait 
for it to page itself back from disk.

-- 
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