samba - Nov 2004 - Samba performance issues (compared win2k)

We're running samba in our organization to serve files in a LAN to windows 
machines (almost XP), and we're having some performance issues with small 
files. With big files (ie, ISO images), it works pretty well. But, when small 
files are involved in the transference, problems arise. In the same 
environment, a Windows 2000 machine (the 'old' server) is able to send
data
to clients nearly at double speed.

We've tried to change some parameters to make the performance better but...
no
way.

So, we're looking for any idea or a point to start to search for some 
additional info.

We are using in a Samba-3.0.7-1.3E, Linux AS 3 Update 4 box, with the Red 
Hat's kernel 2.4.21-15.0.3.ELsmp.

Configuration is as follow:

# Global parameters
[global]
        workgroup = OURWORKGROUP
        server string = Software Server
        interfaces = eth1
        auth methods = guest, sam, winbind
        map to guest = Bad User
        null passwords = Yes
        guest account = ouruser
        passwd program = /usr/bin/passwd %u
        passwd chat = *New*UNIX*password* %n\n *ReType*new*UNIX*password* %n\n 
*passwd:*all*authentication*tokens*updated*successfully*
        username map = /etc/samba/smbusers
        log file = /var/log/samba/smbd.log
        max log size = 10240
        max xmit = 65535
        dns proxy = No
        wins server = 192.168.10.10
        ldap ssl = no
        create mask = 0775
        hosts allow = 127., 192.168.
        cups options = raw
        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192 
IPTOS_LOWDELAY


-- 
Isaac Ojeda Llebry
Servicio de Inform?tica y Comunicaciones de la ULPGC
e-mail: iojeda en becarios.ulpgc.es
Tel?fono: +34 928 459568

Isaac Ojeda Llebry wrote:
> We're running samba in our organization to serve files in a LAN to
windows
> machines (almost XP), and we're having some performance issues with
small
> files. With big files (ie, ISO images), it works pretty well. But, when
small
> files are involved in the transference, problems arise. In the same 
> environment, a Windows 2000 machine (the 'old' server) is able to
send data
> to clients nearly at double speed.
> 
> We've tried to change some parameters to make the performance better
but... no
> way.
> 
> So, we're looking for any idea or a point to start to search for some 
> additional info.
> 
> We are using in a Samba-3.0.7-1.3E, Linux AS 3 Update 4 box, with the Red 
> Hat's kernel 2.4.21-15.0.3.ELsmp.
> 
> Configuration is as follow:
> 
> # Global parameters
> [global]
>         workgroup = OURWORKGROUP
>         server string = Software Server
>         interfaces = eth1
>         auth methods = guest, sam, winbind
>         map to guest = Bad User
>         null passwords = Yes
>         guest account = ouruser
>         passwd program = /usr/bin/passwd %u
>         passwd chat = *New*UNIX*password* %n\n *ReType*new*UNIX*password*
%n\n
> *passwd:*all*authentication*tokens*updated*successfully*
>         username map = /etc/samba/smbusers
>         log file = /var/log/samba/smbd.log
>         max log size = 10240
>         max xmit = 65535
>         dns proxy = No
>         wins server = 192.168.10.10
>         ldap ssl = no
>         create mask = 0775
>         hosts allow = 127., 192.168.
>         cups options = raw
>         socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192 
> IPTOS_LOWDELAY
> 
> 
Try:
	socket options = TCP_NODELAY SO_SNDBUF=65536 SO_RCVBUF=65536 IPTOS_LOWDELAY

Have a look at:
http://www.drouillard.ca/Tips&Tricks/Samba/Oplocks.htm

-- 
Regards
--------------------------------------
Gerald Drouillard
Technology Architect
Drouillard & Associates, Inc.
http://www.Drouillard.ca

El Mi?rcoles, 24 de Noviembre de 2004 11:30, escribi?:
> Are you sure it is samba who is causing delays and not the file system?
No, you are right. I will try to change the file system from EXT3 to REISER.
> What file system are you using? Is the second access to a file as slow as 
the first?

No, the second access seems faster.
> > socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
IPTOS_LOWDELAY
> The default values for RCVBUF and SNDBUF are larger, why do you reduce it?
I tried playing with different values from 1024 to 65535 and it makes no 
sensse. The default option of RCVBUF and SNDBUF is 8192


Thanks