Sorry about that... this is very, very specific stuff. Picture having
to pour numbered beads down a pipe in order, & if you tip them a bit too
fast they back up, fall on the floor and you have to gather them up &
start again where they started to back up... if you are smart you learn
to not pour them quite so fast :)
(I will not hesitate to say that the range of things discussed on this
list that I don't even grasp, much less understand is one of the many
reasons why I LOVE this list!)
davidt
On Fri, Dec 23, 2011 at 11:56:30PM +1100, Andrew Fildes wrote:
> I'm proud to announce that I did not understand one word of this. Well, to be
> fair, I know what an accordion is but I'd rather not see one reshaped before
> the packet ship reaches port.
> Who are they and how are you screwing me?
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 23/12/2011, at 10:42 PM, David Thatcher wrote:
>
> > A large Aussie telco does exactly this on business grade "private IP"
> > networks. The hard ingress rate-limit causes random packet discards
> > (instead of nice sensible queue tail drops) with the result that
> > sustained TCP connections end up getting (on average) less than 10% of
> > the bandwidth as the TCP window size "accordions" due the stupid packet
> > loss. The workaround is to traffic shape on the customer equipment
> > before the port, but this means the client needs to fork out for more
> > gear. It's nice for our bottom line, but from a 'best practice'
> > standpoint, it's utter rubbish.
>
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