[Samba] Samba 4 Slow Performance

[Andrew Bartlett]

On Wed, 2013-07-31 at 10:07 +0800, Kinglok, Fong wrote:
> On 29 Jul, 2013, at 1:13 PM, Andrew Bartlett <abartlet at samba.org> wrote:
> 
> > On Sat, 2013-07-27 at 23:20 +0800, Kinglok, Fong wrote:
> >> Dear all,
> >> 
> >> After using samba 3 for two years, I have just spent totally one week
> >> finishing setting up a samba 4 file system in my working school.
> >> There are about 200 computers, 80+ staff, 1000 students and 10
> >> printers.  The AD was properly setup, mandatory profile and one GPO
> >> policy (which is printer download trust) is effective for all users.
> >> Logon script is for mapping four shares and 10 printers from the file
> >> server.   Also, I have setup two additional DCs (with AD replication
> >> and DHCP server) for two other subnets in the hope to speed up the
> >> logon process.
> >> 
> >> The benefits of Samba 4 are clear: more robust file serving
> >> (supporting the windows ACL), speedy printing (with the help of point
> >> and printer driver) and administration of AD through with windows
> >> remote admin tool.  However, logon speed is just far from good.
> >> 
> >> In the days of Samba 3.6, users can logon the system within 20
> >> seconds, even with more than 80 users logon in the same time (two
> >> classes students login during computer lesson).  Now, with only one
> >> user logging in (who is me), it takes nearly 60 seconds to do the
> >> logon.  I have tried disabling drive and printer mapping in logon
> >> script and applying a registry hack (note 1) shorten the profile
> >> waiting time in windows 7 client side but it makes no difference in
> >> logon speed.
> >> 
> >> I have taken a look on the document in sambaXP 2013:
> >> http://sambaxp.org/fileadmin/user_upload/SambaXP2013-DATA/thu/track1/Matthieu_Patou-Smaller_Faster_Scalier.pdf
> >> 
> >> and two thread in samba-technical mailing list:
> >> https://lists.samba.org/archive/samba-technical/2013-January/089755.html
> >> https://lists.samba.org/archive/samba-technical/2013-May/092332.html
> >> 
> >> It seems that samba team is doing some great work in spotting the
> >> unindexed search in LDB as one of block in performance. 
> > 
> > It is one block, but it is the one we expect to really hit at around
> > 10000, not 1000-2000.  As Richard has indicated, what we need from you
> > is an indication of what operation is slow.  Timeouts of this order
> > indicate something different to a slow database - they indicate things
> > like DNS timeing out. 
> > 
> > Once you work out which specific operation is blocking, we can
> > investigate more - be it in regards to your network, or our code, we
> > don't mind either way, but we need to work out which to look into.
> > 
> > Andrew Bartlett
> > 
> > -- 
> > Andrew Bartlett
> > http://samba.org/~abartlet/
> > Authentication Developer, Samba Team           http://samba.org
> > Samba Developer, Catalyst IT                   http://catalyst.net.nz
> > 
> > 
> 
> 
> Thank you all for responding.
> 
> In these days, I am trying hard to understand the reason of the delay in logon.
> 
> Following your advice, I've done some test on
> 1. Profile deploying
> 2. GPO
> 
> For the first one, I try using roaming profile for one testing user, it turns out 7 seconds to logon the system.  It seems that the culprit of the delay is in the my old mandatory profile.
> For the second one, I try disable all GPO (I only enable point and printer driver trust and folder redirection), turning it on / off does not change the logon time significantly.
> 
> So, I try digging into how to create mandatory profile properly once again.  Here I found:
> http://oakdome.com/k5/tutorials/windows-7-mandatory-roaming-profile.php
> 
> By following the link's instruction, I found it needs 20 seconds in logon.  I hope I can further decrease the logon time (anyone got a hint?)
> 
> I will keep updating the list if I found something worth sharing.

Thanks for getting back to us.  It sounds like this is mostly a
client-side delay than a Samba issue. 

Thanks,

Andrew Bartlett

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