Re: [mpls-linux-general] i want to make sure some parameters in /proc/net/mpls*

[James R. L. <jl...@mi...>]

On Mon, Oct 21, 2002 at 07:05:50PM +0800, Folke Aeon wrote:
> hi, J.
>=20
>   thanks for your answer. but i don;t quite
> understand the meaning of "Reference count"
> would you please tell me how can i find
> more detailed information about it?
>=20
> thanks for your precious time :)

Pointers to MPLS structure are held by other kernel entities that may
be deleted at differnt times then the MPLS structure itself.  A common wa=
y
to handle this is to reference count the structure who's pointer is being
held by other entities.

So when a kernel entity needs the pointer to the MPLS structure, the refe=
rence
count is incremented.  When the kernel entity no longer need the pointer =
to the
MPLS structure the reference count is decremented.  When the reference co=
unt
reaches 0, the MPLS structure is deleted.

The only reason the reference counters are displayed in the /proc/ output
is to help debug cases where MPLS structures are not being cleaned up.

>=20
> folke.
>=20
>=20
>=20
>=20
> >From: "James R. Leu" <jl...@mi...>
> >Reply-To: jl...@mi...
> >To: Folke Aeon <aeo...@ho...>
> >CC: Subject: Re: [mpls-linux-general] i want to make sure some paramet=
ers=20
> >in /proc/net/mpls*
> >Date: Sun, 20 Oct 2002 18:29:28 -0500
> >
> >On Sat, Oct 19, 2002 at 03:50:30PM +0800, Folke Aeon wrote:
> > > hi, all
> > >
> > >   will anyone tell me the meaning of the following parameters in
> > > /proc/net/mpls* :?
> > >
> > > [root@localhost net]# cat mpls_in
> > > 0x40004000 4/256/0 gen 16 0 1 POP PEEK
> > >                  +        + +
> > >                  |        | |
> > >                  |        | +------what does this
> > >                  |        |        mean then?
> > >                  |        |
> > >                  |      label space?
> > >                  |
> > >        what does this zero mean? packets
> > >     dropped?  or bytest dropped?
> >
> >Dropped packets.
> >
> >The '1' is the reference count.
>=20
>=20
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--=20
James R. Leu