Date: Thu, 20 Nov 2003 11:42:47 -0500 (EST) From: Robert Watson <rwatson@freebsd.org> To: Ken Smith <kensmith@cse.Buffalo.EDU> Cc: Len Sassaman <rabbi@anonymizer.com> Subject: Re: Help request: problems with a 5.1 server and large numbers of ssh users. Message-ID: <Pine.NEB.3.96L.1031120114130.19991J-100000@fledge.watson.org> In-Reply-To: <20031120164112.GF29560@electra.cse.Buffalo.EDU>
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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@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@cse.buffalo.edu > there, funny things are everywhere. | > - Theodore Geisel | >
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