That 3Mb difference is probably just packet overhead + congestion control. Goodput on a single TCP flow is always less than link bandwidth, regardless of the link. On Wed, Oct 29, 2014 at 6:57 PM, keith tokash <ktokash@hotmail.com> wrote:
I'm sorry I should have been more specific. I'm referring to the *percentage* of a circuit's bandwidth. For example if you order a 20Mb site to site circuit and iperf shows 17Mb. Well ... that's 15% off, which sounds hefty, but I'm not sure what's realistic to expect.
And beyond expectations, I'm wondering if there's a threshold that industry movers/shakers generally yell at their vendor for going below, and try to get a refund or move the link to a new port/box.
To: ktokash@hotmail.com Subject: Re: Industry standard bandwidth guarantee? From: Valdis.Kletnieks@vt.edu Date: Wed, 29 Oct 2014 19:02:53 -0400 CC: nanog@nanog.org
On Wed, 29 Oct 2014 15:24:46 -0700, keith tokash said:
Is there an industry standard regarding how much bandwidth an inter-carrier circuit should guarantee?
How are you going to come up with a standard that covers both the uplink from Billy-Bob's Bait, Fish, Tackle, and Wifi, where a fractional gigabit may be plenty, and the size pipes that got clogged in the recent Netflix network neutrality kerfluffle?
And where your PoPs are (and how many) matters as well - if you have a peering agreement with another carrier, and you exchange 35Gbits/sec of traffic, the bandwidth at each peer point will depend on whether you peer at one location, or 5, or 7, or 15.....