Help request: problems with a 5.1 server and large numbers of ssh users.

[Robert Watson]

On Thu, 20 Nov 2003, Ken Smith wrote:

> On Thu, Nov 20, 2003 at 10:56:08AM -0500, Robert Watson wrote:
> 
> > Hmm.  Well, it certainly sounds like a resource limit to me, especially if
> > it's a nice round number like "150" or "300".
> 
> One possibility might be running out of pseudo-terminals to support the
> login sessions.  pty's are created as needed I think, and the code that
> handles it is in sys/kern/tty_pty.c.  The limits on it appear to be 256
> ptys: 

I thought about that, but the submitter indicated that pty's were not
being allocated.  However, that would be a really good thing to verify,
since the numbers come out right...

I should really clean up and commit my pty cleanup at some point, as well
as support for forkpty()/openpty()/etc that avoid the sort of code found
below.  Presumably that would be a 5.3 thing. 

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org      Network Associates Laboratories


> 
> /*
>  * This function creates and initializes a pts/ptc pair
>  *
>  * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
>  * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
>  *
>  * XXX: define and add mapping of upper minor bits to allow more
>  *      than 256 ptys.
>  */
> 
> I don't know if simply changing the :
> 
> 	static char *names = "pqrsPQRS";
> 
> to something longer is all that would be required or if there are
> other factors involved.
> 
> -- 
> 						Ken Smith
> - From there to here, from here to      |       kensmith at cse.buffalo.edu
>   there, funny things are everywhere.   |
>                       - Theodore Geisel |
>