[14967] in North American Network Operators' Group
Re: Transparent Caching Solutions - Information Wanted
daemon@ATHENA.MIT.EDU (Dirk Harms-Merbitz)
Wed Feb 4 13:55:29 1998
Date: Wed, 4 Feb 1998 10:24:32 -0800
From: Dirk Harms-Merbitz <dirk@hermosa.power.net>
To: nanog@merit.edu
In-Reply-To: <199802041630.IAA19635@wisdom.rc.vix.com>; from Paul A Vixie on Wed, Feb 04, 1998 at 08:30:22AM -0800
In our case it was a company that creates webpages. Their default
home pages was their own server. Also they must be demoing/doing
quality control their own site quite a bit.
Hmm. Targeted marketing...
Dirk
On Wed, Feb 04, 1998 at 08:30:22AM -0800, Paul A Vixie wrote:
> several folks have sent replies to me personally which may be of general
> interest:
>
> > Hit rates are user population dependent. We have seen hit rates
> > as high as 30% from a single T1 connected customer (with a population
> > of less then 500 people).
>
> so have we. but that was a computer club with its own POP and they were
> mostly sharing interesting (i.e., pornographic) URL's over an IRC back
> channel.
>
> we've got ~80 transparent caching units out in the field, and most of them
> are in "normal" modem pools where the users don't know each other and the
> communitities of interest have broader splay.
>
> > ... in some special cases you really can predict what would best be in the
> > cache beforehand. You then win from a speed standpoint (pre fetched data
> > is served up faster).
>
> yes, that's true -- in some special cases you can exercise prescience and
> if you can then the hit rate goes up by a lot as does the downstream data
> rate.
>
> however, to make this work you have to continuously feed the primary caches
> new prescient data (or prescient metadata by which prescient data can be
> fetched). interest factor is in other words dynamic and shortlived.
