[Samba] Performance problem executing programs from shares

[Gerhard Vögel]

Hello,

recently I migrated 3 Netware 4.11 server to one Linux/Samba-box running on 
Suse Enterprise Server 7. Everything seemed fine, until performance problems 
were detected, especially when starting programs located on shares.

Samba is a domain member using an NT4 PDC for authentication. The current 
samba version is 2.2.6 and the kernel is 2.4.19, but with 2.2.4 and 2.4.18 
there was no difference.

Campared with another samba server configured as PDC (without ldap) on a much 
smaller machine, startime of programs executed from shares is 3 to 4 times 
slower, normal copies are faster. 

I think I tried every parameter that could effect performance but had no 
success. Increasing debug level to 4 produced a windbind log file with the 
following lines:

[2002/10/21 18:11:35, 3] nsswitch/winbindd_sid.c:winbindd_uid_to_sid(173)
  [30983]: uid to sid 10001
[2002/10/21 18:11:35, 3] nsswitch/winbindd_sid.c:winbindd_gid_to_sid(202)
  [30983]: gid to sid 10002
[2002/10/21 18:11:35, 3] nsswitch/winbindd_sid.c:winbindd_gid_to_sid(202)
  [30983]: gid to sid 10001
[2002/10/21 18:11:35, 3] nsswitch/winbindd_sid.c:winbindd_gid_to_sid(202)
  [30983]: gid to sid 10005
[2002/10/21 18:11:35, 3] nsswitch/winbindd_sid.c:winbindd_gid_to_sid(202)
  [30983]: gid to sid 10029
[2002/10/21 18:11:35, 3] nsswitch/winbindd_sid.c:winbindd_uid_to_sid(173)
  [30983]: uid to sid 10001
[2002/10/21 18:11:35, 3] nsswitch/winbindd_sid.c:winbindd_gid_to_sid(202)
  [30983]: gid to sid 10002
[2002/10/21 18:11:35, 3] nsswitch/winbindd_sid.c:winbindd_gid_to_sid(202)
  [30983]: gid to sid 10001

From 18:11.35 till 18:12.03 there are 96400 lines, repeating almost always the 
same gids. And thats only part of it, I already deleted a log with more than 
4 MB zipped size, consisting only of those lines.

Since I have no more ideas, I hope anybody can give me a hint, what's causing 
this problem. 

Tank you
Gerhard


smb.conf
[global]
  log file = /var/log/samba/log.%m
; max xmit = 16384
  encrypt passwords = yes
  server string = %L
  netbios name = cdivw
  workgroup = CDI
  domain master = no
  preferred master = no
  local master = yes
  security = domain
  password server = *
  client code page = 850
  winbind uid = 10000-20000
  winbind gid = 10000-20000
  winbind separator = +
; winbind cache time = 10
  template homedir = /cifs/home/%D/%U
  wins server = 172.31.1.50
  wins support = no
  guest account = nobody
  socket options = TCP_NODELAY IPTOS_LOWDELAY IPTOS_THROUGHPUT SO_SNDBUF=8192 
SO_RCVBUF=8192
  mangled stack = 1024
  mangling method = hash2
  debug level = 1

...

[Share]
  valid users = @CDI+Share, at CDI+Domänen-Admins
  force group = +CDI+Share
  browseable = yes
  create mode = 0660
  directory mode = 770
  writeable = yes
  path = /cifs/common/Share
  hide unreadable = yes

...