Re: [discuss] Re: [RFC:PATCH(003/003)] Memory add to onlined node. (ver. 2) (For x86_64)

[Yasunori Goto <y-goto@jp.fujitsu.com>]

> On Thursday 09 February 2006 10:50, Yasunori Goto wrote:
> 
> > Current code adds memory to ZONE_NORMAL like this.
> > But, ZONE_DMA32 is available on 2.6.15. So, I'm afraid there are
> > 2 types trouble.
> > 
> >   a) When new memory is added to < 4GB, this should be added to 
> >      Zone_DMA32.
> >      Are there any real machine which allow to add memory under
> >      4GB?
> 
> x86-64 machines usually use a continuous memory map 
> because Windows gets unhappy with too big memory holes (and even
> Linux is not completely troublefree for UP install kernels)  And for a small
> system this implies memory < 4GB.

Ah, Ok. Then, it is bug. :-P

> 
> >   b) If machine boots up with under 4GB memory, and new memory 
> >      is added to over 4GB, then kernel might panic due to Zone Normal's
> >      initialization is imcomplete.
> >   
> > Q2) 
> >   Are there any real machine which can add memory with NUMA feature?
> 
> There are and will be.

I see. I'll continue my job with x86_64 too. :-)

Thanks.

-- 
Yasunori Goto