smbd holds 70% cpu

[Nir Livni]

> David Collier-Brown wrote:
> 
> Nir Livni wrote:
> > Hi all,
> >  
> > I have an smbd process (the main smbd process) that holds 70% CPU. 
> > (RedHat 8.0 , samba-2.2.8a)
> >  
> > I used strace and it seems the process is inside a "select" 
> function. 
> > (Only one select function in strace output).
> 
> 	We see this phenomenon in C code with some regularity,
> 	select/poll spinning either on an event or a timeout.
> 
> 	Look at the call, which has the form
> int select(int  nfds,  fd_set  *readfds,  fd_set  *writefds,
>        fd_set *errorfds, struct timeval *timeout);
> 
> 	Firstly, see how often it's happening, either by
> 	reading the contents of the timeval or just counting	
> 	seconds (;-))
> 
> 	Next llok at the return value: -1 for an error (check errno)
> 	0 for a timeout, and a non-zero number if at elast one
> 	fd reorted something.
> 

Does this one look like a reasonable select ?
select(1024, [29 30], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be
restarted).

> 	Then see which of the fdset pointers in non-null.
> 	Look at these and see which bits are set, which will
> 	tell you which fd is reporting the read, write or error.
> 
> 	Then send it a signal to make it break out of the select for
> 	a bit: SIGUSR1 is probably a good one to try.
> 
> --dave
> -- 
> David Collier-Brown,           | Always do right. This will gratify
> Sun Microsystems DCMO          | some people and astonish the rest.
> Toronto, Ontario               |
> (905) 415-2849 or x52849       | davecb at canada.sun.com
> 
> 
>