nanog mailing list archives
Re: packet reordering at exchange points
From: "Peter Galbavy" <peter.galbavy () knowtion net>
Date: Wed, 10 Apr 2002 15:48:36 +0100
To transfer 1Gb/s across 100ms I need to be prepared to buffer at least 25MB of data. According to pricewatch, I can pick up a high density 512MB
Why ? I am still waiting (after many years) for anyone to explain to me the issue of buffering. It appears to be completely unneccesary in a router. Everyone seems to answer me with 'bandwidth x delay product' and similar, but think about IP routeing. The intermediate points are not doing any form of per-packet ack etc. and so do not need to have large windows of data etc. I can understand the need in end-points and networks (like X.25) that do per-hop clever things... Will someone please point me to references that actually demonstrate why an IP router needs big buffers (as opposed to lots of 'downstream' ports) ? Peter
Current thread:
- Re: packet reordering at exchange points, (continued)
- Re: packet reordering at exchange points E.B. Dreger (Apr 09)
- Re: packet reordering at exchange points Richard A Steenbergen (Apr 09)
- fixing TCP buffers (Re: packet reordering at exchange points) E.B. Dreger (Apr 09)
- Re: fixing TCP buffers (Re: packet reordering at exchange points) Richard A Steenbergen (Apr 09)
- Re: fixing TCP buffers (Re: packet reordering at exchange points) E.B. Dreger (Apr 09)
- Re: fixing TCP buffers (Re: packet reordering at exchange points) Richard A Steenbergen (Apr 09)
- Re: fixing TCP buffers (Re: packet reordering at exchange points) E.B. Dreger (Apr 09)
- Re: fixing TCP buffers (Re: packet reordering at exchange points) Richard A Steenbergen (Apr 09)
- Re: fixing TCP buffers (Re: packet reordering at exchange points) E.B. Dreger (Apr 09)
- Re: fixing TCP buffers (Re: packet reordering at exchange points) E.B. Dreger (Apr 09)
- Re: packet reordering at exchange points Peter Galbavy (Apr 10)
- Re: packet reordering at exchange points Neil J. McRae (Apr 10)
- Re: packet reordering at exchange points John Kristoff (Apr 10)
- Re: packet reordering at exchange points Richard A Steenbergen (Apr 10)
- Re: packet reordering at exchange points Peter Galbavy (Apr 10)
- Re: packet reordering at exchange points Mathew Lodge (Apr 10)
- Re: packet reordering at exchange points Stephen Sprunk (Apr 10)
- Re: packet reordering at exchange points Stephen Sprunk (Apr 10)
- Re: packet reordering at exchange points Paul Vixie (Apr 10)
- RE: packet reordering at exchange points Jim Forster (Apr 10)
- Re: packet reordering at exchange points Craig Partridge (Apr 11)