[Lxc-users] Copy-on-write hard-link / hashify feature

[Gordan Bobic]

On 06/11/2010 09:57 AM, Daniel Lezcano wrote:
> On 06/10/2010 10:54 PM, Gordon Henderson wrote:
>> On Thu, 10 Jun 2010, John Drescher wrote:
>>
>>
>>> BTW, a second option is lessfs.
>>>
>>> http://www.lessfs.com/wordpress/?page_id=50
>>>
>> What about the KSM kernel option? It's aimed at KVM I think and in the
>> kernel from 2.6.32. See:
>>
>>     http://lwn.net/Articles/306704/
>> and
>>     http://lwn.net/Articles/330589/
>>
>> Not sure if that could be used to help here - it seems a bit of a
>> retrospective way to find data duplications - assuming we could enable it
>> for whole containers...
>>
>
> KSM is enabled on my ubuntu 10.04. When I do a compilation, ksm takes
> more cpu than the compilation itself and is always eating 10-30% of my
> cpu (Intel(R) Core(TM)2 Duo CPU T9500  @ 2.60GHz). So I disabled it
> definitively ...

Are you saying that KSM is performing memory de-duplication on bare 
metal, rather than inside a KVM VM? That can't be right.

My guess that you have it misconfigured to be scanning the memory too 
frequently and it's spinning empty?

Gordan