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Re: [OM] Strike one up for the underground protest

Subject: Re: [OM] Strike one up for the underground protest
From: David Thatcher <davidt@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 23 Dec 2011 22:12:27 +1030
On Wed, Dec 21, 2011 at 09:04:29PM -0600, Ken Norton wrote:
> The ethernet port facing each customer is rate limited either 
> at the switch itself... <snip>

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.

davidt


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