Re: about page migration on UMA

Jacky(GuangXiang Lee)
2007-11-14T04:31:07Z

Jared Hulbert a??e??:
> On 10/18/07, Christoph Lameter <clameter@sgi.com> wrote:
>
>> On Wed, 17 Oct 2007, Jacky(GuangXiang Lee) wrote:
>>
>>
>>> seems page migration is used mostly for NUMA platform to improve
>>> performance.
>>> But in a UMA architecture, Is it possible to use page migration to move
>>> pages ?
>>>
>> Yes. Just one up with a usage for it. The page migration mechanism itself
>> is not NUMA dependent.
>>
>
> For extreme low power systems it would be possible to shut down banks
> in SDRAM chips that were not full thereby saving power. That would
> require some defraging and migration to empty them prior to powering
> down those banks.
>
>
what is the way to shut down banks in SDRAM chips?