nanog mailing list archives
RE: AT&T MPLS / BIB Routers
From: "Ryan Finnesey" <ryan.finnesey () HarrierInvestments com>
Date: Thu, 17 Feb 2011 06:19:57 -0800
What type of hardware are they using for this BIB router? Cheers Ryan -----Original Message----- From: Mikeal Clark [mailto:mikeal.clark () gmail com] Sent: Wednesday, February 16, 2011 6:16 PM To: Jim Gettys Cc: nanog () nanog org Subject: Re: AT&T MPLS / BIB Routers I'm building up to 3000-4000ms latency with these BIB routers. We never had this issue on the old point to points using Cisco gear. On Wed, Feb 16, 2011 at 5:09 PM, Jim Gettys <jg () freedesktop org> wrote:
On 02/16/2011 05:44 PM, Mikeal Clark wrote:We just put in a AT&T MPLS and are having a pretty negative experience with the "Business in a Box" routers they are using for our smaller sites. We are seeing extremely high latency under load.
Anyone have any experience with these devices that could shed some light on this? Are they really this bad?There is excessive buffering in all sorts of devices all over the
Internet.
This causes high latency under load (along with higher packet losses, and lots of other problems. It's what I've been blogging about on http://gettys.wordpress.com. These buffers fill; and they are so large they have defeated TCP congestion avoidance to boot, with horrifying consequences. So far, I've found this problem (almost) everywhere I've looked: o ICSI has good data that bufferbloat is endemic in DSL, Cable,
and FIOS. Delays are often measured in seconds (rather than
milliseconds).
o some corporate and ISP networks run without AQM, in circumstances that they should. o Windows, Mac OSX and Linux all have bufferbloat in their network stacks, at a minimum on recent network device drivers, and
often elsewhere.
o Every home router I've tested is horrifyingly bad. o 3g networks & 802.11 have this in spades. Why should AT&T's MPLS be any different? My next topic will be "transient" bufferbloat, having to do with defeating slowstart. Come start helping fix this: please join us at bufferbloat.net, as we try to get people to fix it. Already there are some experimental patches for the Linux Intel wireless driver. Jim Gettys Bell Labs
Current thread:
- AT&T MPLS / BIB Routers Mikeal Clark (Feb 16)
- Re: AT&T MPLS / BIB Routers Jim Gettys (Feb 16)
- Re: AT&T MPLS / BIB Routers Mikeal Clark (Feb 16)
- Re: AT&T MPLS / BIB Routers Jim Gettys (Feb 16)
- RE: AT&T MPLS / BIB Routers George Bonser (Feb 16)
- Re: AT&T MPLS / BIB Routers Jim Gettys (Feb 17)
- RE: AT&T MPLS / BIB Routers Ryan Finnesey (Feb 17)
- Re: AT&T MPLS / BIB Routers Mikeal Clark (Feb 17)
- Re: AT&T MPLS / BIB Routers Mikeal Clark (Feb 17)
- Re: AT&T MPLS / BIB Routers Mikeal Clark (Feb 16)
- Re: AT&T MPLS / BIB Routers Jim Gettys (Feb 16)