[Samba] Strange lock problem + sporadic massive slowdown

[Jeremy Allison]

On Thu, Mar 15, 2007 at 03:27:16PM +0100, Michael Rignaz wrote:
> Hi,
> thanks for reading, would be great if you could help me out with two 
> strange reoccuring problems.
> 
> Problem 1:
> 
> Currently we are running an IBM 206m with Debian Etch and Samba 3.0.24.
> We have about 25 Clients which are running Windows XP SP2 or 2000 SP4.
> 3 of those Clients (XP) open and close ~15 excel sheets (size between 
> 100kb and 1MB) approximately every 5 Minutes or so.
> 5-6 times a day it happens to them, that " 'everything' hangs" -as they 
> tell me- for about 20seconds. They are using Windows Explorer for 
> opening different smb shares, browsing and selecting excel files. When 
> this happens, explorer and/or excel freeze for this amount of time. It 
> doesn't seem as the cause being some  kind of networking problem. They 
> are connected with gigabit ethernet (no rx/tx errors) and when this 
> happens, while the problem persists, the network throughput from the 
> affected clients to the server is excellent.
> At those times the machine is ~98%idle. Could more Ram on the server 
> help? We have 1 GB Ram and when all users are connected and acting, only 
> about 14MB of free physical memory is left.Though that's really little, 
> I didn't buy more memory yet, 'cause paged memory size is always near zero.
> Could more ram and raising the values of SO_RCVBUF and SO_SNDBUF help? 
> What would you suggest? Thanks!
> Our options in the smb.conf are as follows:
> 
> socket options = TCP_NODELAY IPTOS_LOWDELAY SO_KEEPALIVE SO_RCVBUF=10240 
> SO_SNDBUF=10240
> domain logons = yes
> preferred master = auto
> utmp = Yes
> map acl inherit = No
> hide files = /.*/desktop.ini/
> oplocks = False
> level2 oplocks = False
> log level=1
> wins support = yes
> reset on zero vc = yes
> 
> Problem 2:
> Once in a week or two we experience the exact behavior as mentioned here 
> : http://lists.samba.org/archive/samba/2006-August/123652.html, which 
> was fixed in 23a already?
> Files (in our case word docs) suddenly (often after a crash) are locked 
> by the user who is actually trying to re-open the file (statically 
> assigned ip address via bootp).
> When I kill the user's process the lock is still active and stays while 
> I can mv around the file as I want to. Only restarting the whole samba 
> daemon fixes that.
> This happend with several version 23 and now with 24 too. Anyone has a 
> clue? :)

Do a testparm -s -v - is printing set to "cups" ?

If so try setting it to "bsd". I've seen this be the
cause of the problem on smbd startup.

Jeremy.