samba - Aug 2018 - ldbsearch performance and tuning...

I'm still on samba4.5, sorry me.


I've done some (bash) scripting around ldbsearch, but i've found some
performance and 'lock' trouble.

a) query seems 'slow'. If i user paged result (--paged) coud achive
 better performance? It is a 'network' optimization only, right? eg:

	ldbsearch --paged -H /var/lib/samba/private/sam.ldb ...

 is totally unuseful, right?


b) in a domain member (so, network queries) i've found some
'ldbsearch'
 processes stalled. I was forced to kill them.
There's some way to prevent that? Eg, via '--socket-options=' or
'--controls=' options?


Thanks.

-- 
dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
  Associazione ``La Nostra Famiglia''         
http://www.lanostrafamiglia.it/
  Polo FVG   -   Via della Bontà, 7 - 33078   -   San Vito al Tagliamento (PN)
  marco.gaiarin(at)lanostrafamiglia.it   t +39-0434-842711   f +39-0434-842797

		Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
      http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000
	(cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)

On Tue, 2018-08-28 at 18:28 +0200, Marco Gaiarin via samba
wrote:
> I'm still on samba4.5, sorry me.
Fix that first.
> I've done some (bash) scripting around ldbsearch, but i've found
some
> performance and 'lock' trouble.
Correct, Samba before 4.7 has very poor unindexed search performance,
due to a bug. 
> a) query seems 'slow'. If i user paged result (--paged) coud achive
>  better performance? It is a 'network' optimization only, right?
eg:
> 
> 	ldbsearch --paged -H /var/lib/samba/private/sam.ldb ...
> 
>  is totally unuseful, right?
Correct, this would just increase the load.
> 
> b) in a domain member (so, network queries) i've found some
> 'ldbsearch'
>  processes stalled. I was forced to kill them.
> There's some way to prevent that? Eg, via '--socket-options='
or
> '--controls=' options?
I would need more information on that.  Fixing the server to run a
current Samba would likely fix that.

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

Mandi! Andrew Bartlett via samba
  In chel di` si favelave...
> > I'm still on samba4.5, sorry me.
> Fix that first.
Eh... i hope on this year.

> > I've done some (bash) scripting around ldbsearch, but i've
found some
> > performance and 'lock' trouble.
> Correct, Samba before 4.7 has very poor unindexed search performance,
> due to a bug. 
OK.
> > a) query seems 'slow'. If i user paged result (--paged) coud
achive
> >  better performance? It is a 'network' optimization only,
right? eg:
> > 	ldbsearch --paged -H /var/lib/samba/private/sam.ldb ...
> >  is totally unuseful, right?
> Correct, this would just increase the load.
But accessing LDAP data via network (eg, from a DM to a DC), the use of
'--paged' will gain some performance increase?

> > b) in a domain member (so, network queries) i've found some
> > 'ldbsearch'
> >  processes stalled. I was forced to kill them.
> > There's some way to prevent that? Eg, via
'--socket-options=' or
> > '--controls=' options?
> I would need more information on that.  Fixing the server to run a
> current Samba would likely fix that.
AFAI've understood, ldbsearch processes stalled sometimes when i'm
doing 'primary' DC (ok, Rowland, the DC with FSMO roles ;-) backup with
Louis script.

I do the backup only on the DC with FSMO roles, and only the DM that
'hit' that DC seems have ldbsearch processes stalled.


Thanks.

-- 
dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
  Associazione ``La Nostra Famiglia''         
http://www.lanostrafamiglia.it/
  Polo FVG   -   Via della Bontà, 7 - 33078   -   San Vito al Tagliamento (PN)
  marco.gaiarin(at)lanostrafamiglia.it   t +39-0434-842711   f +39-0434-842797

		Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
      http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000
	(cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)