Messages in this thread | | | Date | Tue, 7 Feb 2006 09:06:47 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [PATCH 1/5] cpuset memory spread basic implementation |
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On Tue, 7 Feb 2006, Ingo Molnar wrote:
> * Andi Kleen <ak@suse.de> 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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