[Samba] fast reads, slow writes

[Karel Rericha]

We have two SUSE SLES 9.0 x86-64 servers on gigabit network, one with 
RAID1 and samba 3.0.4,
and one with RAID10 upgraded to samba 3.0.9. Both have the same problem: 
when you copy from
server to client, speeds are on big files about 40MB/s for RAID1 and 
about 60MB/s for RAID10.
But when you copy to server, speed are about 8MB/s. I have set up ftp 
servers on them just to try
ftp protocol upload, and  it is happy full speed both directions.

After few hours of googling, I found "security = share" hint, which 
didn't help, and after little more
time "use sendfile  =  yes" hint, which helped little bit, speeds are 
now 10-12MB/s, but still not
acceptable.

We don't intend to use samba servers as PDC, but just only as workgroup NAS.

Original smb.conf is attached (before security and sendfile tweaking).

One more question: does anybody know good utility to test speed of 
remote volumes ?
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# smb.conf is the main Samba configuration file. You find a full commented
# version at /usr/share/doc/packages/samba/examples/smb.conf.SUSE
# Date: 2004-06-30
[global]
   workgroup = MAXENT
   printing = cups
   printcap name = cups
   printcap cache time = 750
   cups options = raw
   printer admin = @ntadmin, root, administrator
   username map = /etc/samba/smbusers
   map to guest = Bad User
   logon path = \\%L\profiles\.msprofile
   logon home = \\%L\%U\.9xprofile
   logon drive = P:
   security = user
   encrypt passwords = yes
   domain logons = no
   ldap idmap suffix = ou=Idmap
   ldap machine suffix = ou=Computers
   local master = yes
   wins server = 
   wins support = no
   add machine script = 
   preferred master = auto
   ldap admin dn = cn=Administrator,dc=site
   ldap suffix = dc=site
[homes]
   comment = Home Directories
   valid users = %S
   browseable = no
   read only = No
   inherit permissions = Yes
   guest ok = no
   printable = no
[profiles]
   comment = Network Profiles Service
   path = %H
   read only = No
   store dos attributes = Yes
   create mask = 0600
   directory mask = 0700
   browseable = yes
   guest ok = no
   printable = no
[users]
   comment = All users
   path = /home
   read only = No
   inherit permissions = Yes
   veto files = /aquota.user/groups/shares/
   browseable = yes
   guest ok = no
   printable = no
[groups]
   comment = All groups
   path = /home/groups
   read only = No
   inherit permissions = Yes
   browseable = yes
   guest ok = no
   printable = no
[pdf]
   comment = PDF creator
   path = /var/tmp
   printable = yes
   print command = /usr/bin/smbprngenpdf -J '%J' -c %c -s %s -u '%u' -z %z
   create mask = 0600
   browseable = yes
   guest ok = no
[printers]
   comment = All Printers
   path = /var/tmp
   printable = yes
   create mask = 0600
   browseable = no
   guest ok = no
[print$]
   comment = Printer Drivers
   path = /var/lib/samba/drivers
   write list = @ntadmin root
   force group = ntadmin
   create mask = 0664
   directory mask = 0775
   browseable = yes
   guest ok = no
   printable = no
[z]
   comment = shared drive Z
   path = /shared/z/
   writeable = yes
   browseable = yes
   guest ok = yes
   printable = no
   public = yes
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