Sudden jump in cpu after a client change

[Jeremy Allison]

On Mon, Feb 09, 2004 at 11:40:07AM -0500, David Collier-Brown wrote:
> This may turn out to be a Samba-related problem...
> 
> On Thu, Jan 29, 2004 at 02:54:42PM -0500, David Collier-Brown wrote:
> >  On a Samba 2.2 site, a colleague of mine observed a sudden
> >jump in CPU usage after a change made to the clients.
> > "A tech modified the XP workstations to forcible reconnect any
> >disconnected drive through a script that utilizes the WMI event.
> >As of Tuesday we noticed a considerable jump in CPU utilization
> >of our host."  When my colleague stops the smbd and the nmbd process
> >the server returns to about 27% utilization.
> 
> >  Well, this turned out to be a client program which looped
> >to check that drives were mapped on client machines, and
> >checked every five seconds by reading the top-level directory
> > and remapping it if it was down.
> 
> 	It turns out the machines are XP workstations, on
> 	which the drives are mapped at the DOS command prompt.
> 	The users use the dos interface for user applications.
> 
> 	The samba server has
>  		deadtime = 10
> 		keepalive = 600
> 		socket options = TCP_NODELAY IPTOS_LOWDELAY SO_KEEPALIVE
> 
> 	It looks like the inactive users are being disconnected	
> 	after 10 minutes inactivity, and then are unable to
> 	auto-reconnect. The symptom they see is the app
> 	complaining  "can't save your file".
> 
> 	Has anyone seen this before on XP and/or using the
> 	"net" command to map the drives?

What does the debug level 10 show at auto-reconnect time ?

That's a minimum requirement to debug this.

Jeremy.