Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [discuss] Re: [RFC:PATCH(003/003)] Memory add to onlined node. (ver. 2) (For x86_64) | Date | Thu, 9 Feb 2006 11:41:43 +0100 |
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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.
> 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.
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