[Samba] Slow ldap membership query in large active directory

[Marco Gaiarin]

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> We noticed that the query to get all the gidNumbers of the courses the 
> user is a member of takes about 370ms, while a simple query takes 47ms 
> (including bind/unbind). See the test results below.

While not measuring it, i feel same result here.

You speak about 'gidNumber', so i suppose you are using RFC2307.


I don't know if it is correlated (but i feel it...) also offline caching
does not work in RFC2307 mode:

	https://bugzilla.samba.org/show_bug.cgi?id=15405


So i can only suppose there's plently room for optimization in RFC2307...

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