RE: [core-dev] Bandwidth Balanced Swarms?

I see -- thanks, Sam. I thought that it might be a feature (makes sense in some ways to balance the node on a public p2p network so that no one node is overtaxed) and wondered if it would be simple enough to specify which nodes or IP ranges should download full speed while leaving the default behavior (balancing) as-is for other nodes. I'll continue to poke around and see if there's a simple way to do that, and would be happy to follow your lead if you have ideas on where in the code to do that... do you think, for example, that making the download chunk size larger would help at all (just an idea; if the download chunks are large, coming from my own servers, maybe there won't be enough time for load to be balanced as other sources are found... but maybe not, come to think of it, since the download speed from my servers tapers off as soon as an other source is found so as i think it through while typing this my guess is that a larger chunk size won't help....hmmmm!) Brian

----- Original Message -----
From: "Sam Berlin"
To: [email protected]
Subject: RE: [core-dev] Bandwidth Balanced Swarms?
Date: Sat, 27 Nov 2004 17:01:39 -0500

Hi Brian,

I suspect this is a limitation of the way LimeWire synchronizes its data-structures related to which parts of the file have been downloaded. If a server is very slow sending a response to a single request, that request will hold up all other connections from requesting a new chunk. The downloading code is long overdue for some re-architecting, to remove these limitations and simplify the class in general. Unfortunately, I don’t believe this limitation can be removed without some serious changes to ManagedDownloader and the way downloading is general is designed.

Thanks,

Sam

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From: [email protected] [mailto:[email protected]] On Behalf Of Brian Fall
Sent: Saturday, November 27, 2004 4:52 PM
To: [email protected]
Subject: [core-dev] Bandwidth Balanced Swarms?

Hello again -- I posted this to the forums, thinking it was more along the lines of a question the end user community could help with, but since I'll want to have full speed from my own nodes I thought I'd repost here in hopes that I can be pointed in the right direction. Curently I'm looking in ManangedDownloader and HTTPDownloader to relax this balancing, if possible. Is that the right place to look? Regards, Brian

Hello... I can't be certain, but for me (Limewire Pro 4.2.3) it looks like Limewire is balancing bandwidth between the various sources when swarming a download. I have tested this with my own server, which drops in upload speed (to the test client) shortly after the client finds more sources -- my client starts off downloading at full speed from my server initially, since its the first source it finds, but then the upload speed dramatically tapers off once the client finds other sources. For example, with only my server as the source the transfer rate is about 100KB, but that drops down to about 5KB once the client finds other sources.

Is this how Limewire was designed? I ask because I wanted to use my own server as the main source (fastest downloads), with only minor amounts being downloaded from the larger Gnutella network. But no matter what I try I can't seem to keep a full speed download going from my server once other sources are available to the client.

Is there a way to do that?

With thanks for any insight into the Limewire design you can offer!
Brian

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