Date: Wed, 23 May 2001 22:31:16 +0100 From: Brian Somers <brian@Awfulhak.org> To: Mike Smith <msmith@FreeBSD.ORG> Cc: freebsd-arch@FreeBSD.ORG, brian@Awfulhak.org Subject: Re: RFC: unit_list routines Message-ID: <200105232131.f4NLVGF11782@hak.lan.Awfulhak.org> In-Reply-To: Message from Brian Somers <brian@Awfulhak.org> of "Wed, 23 May 2001 22:09:27 BST." <200105232109.f4NL9RF11365@hak.lan.Awfulhak.org>
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> Where did I put that smoke....
>
> Anyone care to try
>
> # ppp -unit 16777215
>
> I don't care for the consistency of the results (/dev/tun16777215 is
> created ok, but seems to be talking to interface tun0). Is subr_bus.c
> *really* trying to allocate 0xffffff device_t pointers and set them
> all except the last to NULL ? That's 67Mb of memory.
No, I mistyped the command line. When I actually type the above the
device_t * malloc fails (M_NOWAIT). As it turns out, because struct
ifnet's if_unit is a short, allocating a tun unit > 32767 fails, but
unfortunately (due to another bug) creates an interface with a
wrapped unit number.
I guess this provides a practical limit unit as far as tun is concerned.
--
Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org>
<http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org>
Don't _EVER_ lose your sense of humour !
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