Re: [PATCH 3 of 4] sparsemem: reduce i386 PAE section size

[Jeremy Fitzhardinge]

Dave Hansen wrote:
> Developers should probably learn the tradeoffs before they go start
> poking around in code and sending patches. ;)
>   

I don't know any better way of learning the tradeoffs than by poking 
around and sending patches ;)

> BTW, the current 1G sections were picked because all the hardware we
> knew of at the time had 512MB dimms that had to be added in pairs.  So,
> we didn't ever have physical hotplug of less than that.
>   

I guessed it was something like that.  Even for my case 1G isn't too 
bad.  It was bad when I was trying to hotplug early and it was having 
allocation failures in the bootmem allocator, but I think it should be 
OK now.  On the other hand, when you're hotplugging new memory is 
precisely when you don't want to be allocating lots of new memory...

   J
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