Re: [RFC 00/15] x86_64: Optimize percpu accesses

[H. Peter Anvin]

Eric W. Biederman wrote:
> > x86_64 are small systems? For 64 bit use one would expect 4GB of memory.
>
> Anything over 1G where 32bit runs out of lowmem starts to be a win.
> Plus sometimes it just doesn't make sense to use a 32bit kernel.
>
> Expecting 4GB of real memory seems silly.

Especially since people set up VM instances small and then grow them. 
They can have *weird* CPU-to-RAM ratios; I have heard of 8 VCPUs and
24 MB of RAM in production.

	-hpa

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