Very Computer

can be configured on a 2.x.x kernal?

I really want 512 or 1024 if I can get that many. I examined tty.h
in the kernal source and found that NR_PTYS is defined to be 256
and a warning not to mess with it unless .....

Is it really necessary to hack the kernal to increase the count?

I considered just hacking /dev/MAKEDEV to increase the number,
but I think this may confuse the kernal if I also don't hack pty.[ch] :-(

What a mess.

Am I stuck with 256?

I hate to say this but solaris is so easy here, just edit /etc/system
to change cnt_pty to what ever number you need and reboot.

Oh well, maybe on a later kernal release this sort of thing will
be dealt with.

Dave

No, not if you use the Unix98 pty's available in the 2.2.x kernel.

Quote:> I considered just hacking /dev/MAKEDEV to increase the number,
> but I think this may confuse the kernal if I also don't hack pty.[ch] :-(

> What a mess.

> Am I stuck with 256?

The maximum that can be configured is 2048.

: CONFIG_UNIX98_PTY_COUNT:
:
: The maximum number of Unix98 PTYs that can be used at any one time.
: The default is 256, and should be enough for desktop systems. Server
: machines which support incoming telnet/rlogin/ssh connections and/or
: serve several X terminals may want to increase this: every incoming
: connection and every xterm uses up one PTY.
:
: When not in use, each additional set of 256 PTYs occupy
: approximately 8 KB of kernel memory on 32-bit architectures.

Quote:> I hate to say this but solaris is so easy here, just edit /etc/system
> to change cnt_pty to what ever number you need and reboot.

> Oh well, maybe on a later kernal release this sort of thing will
> be dealt with.

See above.
BTW, it's kernel with two ees.
              ^

--
Cheers
  Anders Larsen
e-mail: alarsen AT baumerident DOT com

Q: What does the CE in Windows CE stand for?
A: Caveat Emptor

In newsgroup: comp.os.linux.development.system

Quote:

> : When not in use, each additional set of 256 PTYs occupy
> : approximately 8 KB of kernel memory on 32-bit architectures.

> > I hate to say this but solaris is so easy here, just edit /etc/system
> > to change cnt_pty to what ever number you need and reboot.

> > Oh well, maybe on a later kernal release this sort of thing will
> > be dealt with.

> See above.
> BTW, it's kernel with two ees.
>               ^

In a future release (2.5 series) this hopefully will either be a
sysctl or fully dynamic.

        -hpa

--

"Unix gives you enough rope to shoot yourself in the foot."