Date: Thu, 02 Nov 2006 11:12:47 +0100 From: Francois Petillon <ftpmaint@proxad.net> To: freebsd-hubs@freebsd.org Subject: Re: ISO downloads with multiple mirrors for higher reliabilty, automatic checksum verification Message-ID: <4549C49F.4090109@proxad.net> In-Reply-To: <004701c6fdf6$28f40260$0201a8c0@blip> References: <004701c6fdf6$28f40260$0201a8c0@blip>
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Anthony L. Bryan wrote: > I've made Metalinks for a few FreeBSD ISOs: > http://www.metalinker.org/samples/FreeBSD_6_2-BETA3-amd64-bootonly_iso.metal > ink As these Metalinks are not officials, would it be possible to remove ftp.fr.freebsd.org from these files ? I do not want to support nor promote an "open standard" that encourage software to do parallel segmented downloads. I have several problems with segmented downloads. As software open several connections (it may be several connections on a single server or single connections on several servers, the result is the same), servers will serve more connections and will have less memory usable per connection. As one of the biggest problem on servers is related to disks IO optimizations, less memory may lead to smaller block reads (and thus higher disk load). Even if the server has enough memory, as the file are requested by segments, you are disabling on the server the ability to fully optimize its disk requests. Last but not the least (and it does not concern bittorent downloads, only servers), if you do not download at max speed, it means there is a _real_ bottleneck. It may be on the server, it may be on the network but speeding up download by using segmented downloads will not create bandwidth, you will just steal bandwidth to other people. François
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