[Samba] ldap owncloud and samba ad

[Andrew Bartlett]

On Thu, 2017-03-16 at 19:05 +0100, Micha Ballmann via samba wrote:
> Hello,
> 
> im authenticating my Owncloud aigainst one of my three domain
> controller 
> and add a second one of it as failover. The authentication works
> pretty 
> well. When im trying to share files or folders i have the problem,
> that 
> it takes a lot of time until i get the username i want to share. 
> Compared to my open ldap the samba4 ad needs about 10-15 seconds more
> to 
> find a result, thats pretty stressful if you want to share
> for  serveral 
> users.

Indeed.

> I hope you can help me to speed up :-D.

I don't have any silver bullets, but Samba 4.6 will be a little faster
than previous versions.  The big improvement normally comes from
working out what search expressions are in use and ensuring they always
use an index.

Samba sadly still uses a single process for all LDAP, and this can be a
bottleneck. 

If you build from source with debugging symbols, then a 'linux perf'
flame graph per 
http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html can help a
lot with understanding what is slow.

I hope this helps,

Andrew Bartlett

-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba