Date: Wed, 19 May 1999 09:04:05 +0100 From: Brian Somers <brian@Awfulhak.org> To: "Tim Pushor" <timp@orion.ab.ca> Cc: questions@FreeBSD.ORG Subject: Re: Number of TUN devices Message-ID: <199905190804.JAA01055@keep.lan.Awfulhak.org> In-Reply-To: Your message of "Tue, 18 May 1999 12:31:44 MDT." <003401bea15c$c0af4e10$1001a8c0@timmys.shl.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> Hello,
>
> Does anyone know how man tun devices I can run in the 3.x kernels? I would
> like to run LOTS (as many as possible), so even if I had to potentially
> modify the kernel...
I've got 300 configured on my development box, and I've tested the
devices > minor 256 (to see that minor numbers with the ``hole''
work).
Unfortunately, after running ppp a couple of hundred times, the
machine was suffering a bit. I haven't tried this since I revised
the setitimer() stuff in ppp though - so it may actually be plausible
to run 200-300 ppps, especially if it's something like ppp over udp
without compression as there are far fewer overheads.
YMMV - especially with something like nos-tun(8).
AFAIR, there was a problem in OpenBSD's version of config(8) that
stopped ``pseudo-device tun 257'' from getting things right as it
ended up overflowing the minor number and incrementing the major
number :-( There may have been some minor (heh!) MAKEDEV problems
too. I wouldn't be surprised if NetBSD suffered similar problems.
> Thanks,
> Tim
PS, the output of ``netstat -i'' looks silly when you've got more
than 100 devices :-/
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@uk.FreeBSD.org>
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199905190804.JAA01055>