[Samba] Poor perfomance Samba 3.0 + DBF/PX

Sebastian Davancens

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Apr 16, 2004, 8:50:13 AM4/16/04

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Im running a linux fiel server with RH 8.0 and Samba,
acting as a PDC. 40 clients (Win98/2000) use an application
that is based on Foxpro and Paradox tables, which are stored
in the server (Contabilidad and CRT shares).
The problem is the following: with samba 2.2.8, everything worked fine.
But when we updated to 3.0.2a, the perfomance dicreased a lot. Its really
slow. Apart from that, the .dbf files started to corrupt oftenly.
The smb.conf has not been changed.
Why is this happening??
Here i post a part of my smb.conf file:

[global]

socket options = TCP_NODELAY IPTOS_LOWDELAY
SO_SNDBUF=8192 SO_RCVBUF=8192
domain master = Yes
encrypt passwords = Yes
logon home = \\%L\%U
server string = Samba PDC running %v
logon script = login.bat
veto oplock files =
/*.dbf/*.DBF/*.cdx/*.CDX/*.db/*.DB/*.Y??/*.y??/*.XG?/*.xg?/*.MB/*.mb/*.VAL/*.val/*.PX/*.px/*.mdb/*.MDB/*.lck/*.LCK/
workgroup = SMBAR
logon path = \\%L\profiles\%U
os level = 64
directory mask = 0770
printcap name = /etc/printcap
preferred master = Yes
domain admin group = @admins
domain logons = Yes
log level = 1

[homes]
comment = Home Directories
force group = admins
read only = No
force create mode = 0770
browseable = No

[profiles]
path = /home/samba/profiles
read only = No
create mask = 0600
directory mask = 0700
browseable = No

[netlogon]
comment = Network Logon Service
path = /home/netlogon
write list = @admins
browseable = No
browseable = No

[CRT]
comment = CRT
path = /home/captacion/tmkt
admin users = @admins
write list = @admins, @gr_crt
force group = gr_crt
create mask = 0775
force create mode = 0775
browseable = No
dont descend = contabilidad ccvd

[contabilidad]
comment = contabilidad
path = /home/captacion/tmkt
admin users = @admins
read list = @admins, @gr_crt
write list = @gr_contabilidad
force group = gr_contabilidad
browseable = No
dont descend = crt

One last note: we have already tried with level2 oplocks = false
and kernel oplocks = false, but it was useless
Thanks in advance,
Sebastian

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Sebastian Davancens

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Apr 16, 2004, 9:10:38 AM4/16/04

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Rodrigo Grumiche Silva

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Apr 17, 2004, 12:40:10 PM4/17/04

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Sebastian

Did you try to disable oportunistic locking (oplocks) ???

[CRT]
....
oplocks = false
...

[Contabilidad]
...
oplocks = false
...

More information about oplocks:

http://us3.samba.org/samba/docs/man/locking.html#id2930056

Regards

Grumiche

Gerald Drouillard

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Apr 18, 2004, 8:50:12 AM4/18/04

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Sebastian Davancens wrote:
> Im running a linux fiel server with RH 8.0 and Samba,
> acting as a PDC. 40 clients (Win98/2000) use an application that is
> based on Foxpro and Paradox tables, which are stored in the server
> (Contabilidad and CRT shares).
> The problem is the following: with samba 2.2.8, everything worked fine.
> But when we updated to 3.0.2a, the perfomance dicreased a lot. Its really
> slow. Apart from that, the .dbf files started to corrupt oftenly.
> The smb.conf has not been changed.
> Why is this happening??

Take a look at:
http://www.drouillard.ca/Tips&Tricks/Samba/Oplocks.htm
there is a smb.conf example for 3.x.

A couple of thing that will affect your performance are:
getwd cache = yes
socket options = TCP_NODELAY SO_SNDBUF=65536 SO_RCVBUF=65536 IPTOS_LOWDELAY
use sendfile = no
lock spin time = 15
lock spin count = 100

Regards
Gerald Drouillard
http://convert2samba.com