>>>>> "GA" == Glyn Astill <glynast...@yahoo.co.uk> writes:

GA> I was hoping someone had seen this sort of behaviour before,
GA> and could offer some sort of explanation or advice.

Jesper's reply is probably most on point as to the reason.

I know that recent Opterons use some of their cache to better manage
cache-coherency.  I presum recent Xeons do so, too, but perhaps yours
are not recent enough for that?

-JimC
-- 
James Cloos <cl...@jhcloos.com>         OpenPGP: 1024D/ED7DAEA6

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