[Samba] samba 4.7.3 DLZ performance regression

[Andrew Bartlett]

On Thu, 2017-12-14 at 20:17 -0600, Arthur Ramsey via samba wrote:
> Can you provide a reference to the "GUID index change" commit so I can 
> more easily track when it gets included in a stable release?  Currently 
> targeted for 4.8.0?

Yes, the GUID index change, which combined with a change to the way we
handle SCOPE_ONELEVEL indexed queries is the best fix for this issue. 
These changes are all in master.

However we were able to devise a backportable fix to the index code and
we have proposed that for 4.7.  It changes the index code in a
different way, one that is much more limited and so more appropriate
for the backport.  With this the critical 'not found' response time is
returned to at around 20ms. 

I'm currently working to get that approved for release in 4.7.4,
however the patches I proposed have been objected to.  As such, I can't
tell you when this will be resolved or Samba 4.7.4 will be released,
but I hope it is soon.

Feel free to CC yourself to the bug:
https://bugzilla.samba.org/show_bug.cgi?id=13191

I'll continue to make the case for getting this fixed as soon as
possible.

Thanks,

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