nanog mailing list archives
Re: Extreme congestion (was Re: inter-domain link recovery)
From: Fred Baker <fred () cisco com>
Date: Wed, 15 Aug 2007 23:46:12 -0700
On Aug 15, 2007, at 10:13 PM, Adrian Chadd wrote:
Well, emprically (on multi-megabit customer-facing links) it takes effect immediately and results in congestion being "avoided" (for values of avoided.) You don't hit a "hm, this is fine" and "hm, this is congested"; you actually notice a much smoother performance degredation right up to 95% constant link use.
yes, theory says the same thing. It's really convenient when theory and practice happen to agree :-)
There is also a pretty good paper by Sue Moon et al in INFOCOMM 2004 that looks at the Sprint network (they had special access) and looks at variation in delay pop-2-pop at a microsecond granularity and finds some fairly interesting behavior long before that.
Current thread:
- Re: inter-domain link recovery, (continued)
- Re: inter-domain link recovery Stephen Wilcox (Aug 15)
- RE: inter-domain link recovery michael.dillon (Aug 15)
- Extreme congestion (was Re: inter-domain link recovery) Sean Donelan (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Fred Baker (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Sean Donelan (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Valdis . Kletnieks (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Fred Baker (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Sean Donelan (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Fred Baker (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Adrian Chadd (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Fred Baker (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Sean Donelan (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Randy Bush (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Alexander Harrowell (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Stephen Wilcox (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Sean Donelan (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Randy Bush (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Alexander Harrowell (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Randy Bush (Aug 16)
- Re: Extreme congestion (was Re: inter-domain link recovery) Sean Donelan (Aug 16)
- Re: inter-domain link recovery Stephen Wilcox (Aug 15)
- Re: Extreme congestion (was Re: inter-domain link recovery) Sean Donelan (Aug 16)