[Samba] Samba 4 Slow Performance

Kinglok, Fong
Sat, 27 Jul 2013 15:20:46 -0000

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.  Certainly, I can wait for the new
version 4.0.X for the boost of performance.  However, I am in deep panic when
lessons are going to be launched on 1st September 2013 here in Hong Kong.  Are
there any patches so that I can a hot / dirty fix?

Thanks for attending.

Kinglok, Fong

Note: "Set maximum wait time for the network if a user has a
roaming...." to 1 (setting it to 0 will default it to 30 seconds) and
"Startup policy processing wait time..." to 1
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