Messages in this thread | | | Date | Fri, 11 Jul 2008 13:10:41 -0400 | From | "H. Peter Anvin" <> | Subject | Re: [RFC 00/15] x86_64: Optimize percpu accesses |
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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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