On Tue, 7 Feb 2006, Ingo Molnar wrote:
> * Andi Kleen <[email protected]> wrote:
>
> > I still don't really think it will make much difference if the file
> > cache is local or global. Compare to disk IO it is still infinitely
> > faster, so a relatively small slowdown from going off node is not that
> > big an issue.
>
> well, maybe the SGI folks can give us some numbers?
The latency may grow (average) by a factor of 4 (same thoughput though on
our boxes). On some architectures it is significantly more and also the
bandwidth is reduced.
This is a significant factor. Applications that do not manage locality
correctly loose at least 30-40% performance.
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