[c-nsp] to shape or not to shape

[Keegan Holley]

Yes you are correct, shaping will keep packets from being dropped until the
queues are full.  However, once the queues are full there is nothing else
for the router to do but tail drop.  This is true with or without shaping.
 Also, "adding" buffers does not add more memory to be used to queue
packets.  Instead it partitions the available memory further to allow more
levels of service.  The amount of buffer memory available to a platform is
finite.  When it is full the left over packets are discarded no matter what
kind of QOS is configured.



On Sat, Oct 9, 2010 at 4:40 PM, Roger Wiklund <copse at xy.org> wrote:

> > In that perspective shaping to the
> > interface speed is rather pointless.
>
> Yeah that's what I belive also. This whole thing started with a person
> at my work telling me that we should shape a 1984 to 1984 just to
> delay packets instead of tail dropping.
>
> I just wanted to get my head around this.
>
> Thanks,
>
> /Roger
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