Date: Thu, 10 Jul 2003 12:04:09 +0200 (CEST) From: Dirk-Willem van Gulik <dirkx@webweaving.org> To: Terry Lambert <tlambert2@mindspring.com> Cc: Max Clark <max.clark@media.net> Subject: Re: What ever happened with this? "eXperimentalbandwidthdelayproduct code" Message-ID: <20030710115853.O96627-100000@foem> In-Reply-To: <3F0D3849.9E3AF6BD@mindspring.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, 10 Jul 2003, Terry Lambert wrote: > > Okay, let's say how do I force my machine to think it doesn't have any > > latency and saturate a 6Mbit/s link even though the link has 220ms latency? > > See the recent discussion on the FreeBSD-performance mailing list. Your propblem is similar to that encountered in sat links; where you have at least a 2 x 280ms RTT's and exteremely reliable/error free 'big' links (ok, that is not quite true; but the ECC is configurable so you simply set the error rate; and use power, width and dish size amongst other as a design parameter to play iwth). Another goed overview document is best current practices for satellite links (BCP28): http://www.faqs.org/rfcs/rfc2488.html or http://mmlab.snu.ac.kr/course/AdvancedInternet/reading/SatelliteTCP.htm Alternatively if a specific protocol is involved the use of a proxy for that protocol to intentionally break end to end semantics can do wonders. We've done this in the past for protocols such as ftp, http and smtp; and it works wonders. Dw
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030710115853.O96627-100000>