On Tuesday 07 February 2006 18:06, Christoph Lameter wrote:
> 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.
This number is for local mapped memory I assume.
But do you have any numbers for file caches or dentry/inode caches?
My guess is that if an application would lose that much in read/write
or readdir/stat it would call them too often :) But it's unlikely
i guess.
-Andi
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