nanog mailing list archives
Re: 923 Mbps across the Ocean ...
From: "David G. Andersen" <dga () lcs mit edu>
Date: Fri, 7 Mar 2003 16:37:51 -0500
On Fri, Mar 07, 2003 at 10:09:51PM +0100, Mikael Abrahamsson quacked:
On Fri, 7 Mar 2003, Richard A Steenbergen wrote:Production commercial networks need not apply, 'lest someone realize that they blow away these speed records on a regular basis.What kind of production environment needs a single TCP stream of data at 1 gigabit/s over a 150ms latency link? Just the fact that you need a ~20 megabyte TCP window size to achieve this (feel free to correct me if I'm wrong here) seems kind of unusal to me.
It's unusual, but it's not completely unheard of. One of the biggest sources of such data is VLBI (interferometry to measure the movement of the earth's crust), in which signals from geographically distributed measurement sites have to be recorded and correlated at a central site: http://web.haystack.edu/vlbi/vlbisystems.html The signals are massive. Right now they use specially made tape drives that can record 1Gb/s: ftp://web.haystack.edu/pub/mark4/memos/230.2.pdf ftp://web.haystack.edu/pub/mark4/memos/HDR_concept.PDF and they send the data around via airplanes. They'd love to be able to do real-time correlation of the data, but that involves collecting 6 of these feeds at a central site (more coming). The feeds must be capable of running unattended for up to 24 hours (86 terabytes each, or an aggregate of half a petabyte per day). Yes, backbones push more than a gigabit across links, but not as for a single flow of data. -Dave -- work: dga () lcs mit edu me: dga () pobox com MIT Laboratory for Computer Science http://www.angio.net/ I do not accept unsolicited commercial email. Do not spam me.
Current thread:
- 923 Mbps across the Ocean ... Eric Germann (Mar 07)
- Re: 923 Mbps across the Ocean ... Dave Israel (Mar 07)
- Re: 923 Mbps across the Ocean ... Stephen J. Wilcox (Mar 07)
- Re: 923 Mbps across the Ocean ... Robert E. Seastrom (Mar 07)
- Re: 923 Mbps across the Ocean ... Richard A Steenbergen (Mar 07)
- Re: 923 Mbps across the Ocean ... Mikael Abrahamsson (Mar 07)
- Re: 923 Mbps across the Ocean ... Richard A Steenbergen (Mar 07)
- Re: 923 Mbps across the Ocean ... David G. Andersen (Mar 07)
- Re: 923 Mbps across the Ocean ... Marshall Eubanks (Mar 07)
- Re: 923 Mbps across the Ocean ... Marshall Eubanks (Mar 07)
- Re: 923 Mbps across the Ocean ... fingers (Mar 07)
- Re: 923 Mbps across the Ocean ... Matt Zimmerman (Mar 07)
- Re: 923 Mbps across the Ocean ... Stephen J. Wilcox (Mar 07)
- Re: 923 Mbps across the Ocean ... Richard A Steenbergen (Mar 07)
- Re: 923 Mbps across the Ocean ... E.B. Dreger (Mar 07)
- Re: 923 Mbps across the Ocean ... Jason Slagle (Mar 08)
- Re: 923 Mbps across the Ocean ... alex (Mar 08)
- Re: 923 Mbps across the Ocean ... Stephen J. Wilcox (Mar 07)
- Re: 923 Mbps across the Ocean ... Dave Israel (Mar 07)
- Re: 923 Mbps across the Ocean ... Hank Nussbacher (Mar 08)