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| 16 | <h1><a href="../index.html">BitTorrent<span>.org</span></a></h1> |
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| 20 | <li><a href="../index.html">Home</a></li> |
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| 21 | <li><a href="../introduction.html">For Users</a></li> |
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| 28 | <!-- ### Begin Content ### --> |
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| 32 | |
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| 33 | <table class="rfc2822 docutils field-list" frame="void" rules="none"> |
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| 34 | <col class="field-name" /> |
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| 35 | <col class="field-body" /> |
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| 36 | <tbody valign="top"> |
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| 37 | <tr class="field"><th class="field-name">BEP:</th><td class="field-body">16</td> |
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| 38 | </tr> |
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| 39 | <tr class="field"><th class="field-name">Title:</th><td class="field-body">Superseeding</td> |
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| 40 | </tr> |
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| 41 | <tr class="field"><th class="field-name">Version:</th><td class="field-body">11020</td> |
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| 42 | </tr> |
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| 43 | <tr class="field"><th class="field-name">Last-Modified:</th><td class="field-body"><a class="reference external" href="http://svn.bittorrent.org/trac/browser/dotorg/trunk/html/beps/bep_0016.rst">2008-02-25 22:14:29 -0800 (Mon, 25 Feb 2008)</a></td> |
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| 44 | </tr> |
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| 45 | <tr class="field"><th class="field-name">Author:</th><td class="field-body">John Hoffman <theshadow at degreez.net></td> |
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| 46 | </tr> |
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| 47 | <tr class="field"><th class="field-name">Status:</th><td class="field-body">Draft</td> |
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| 48 | </tr> |
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| 49 | <tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td> |
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| 50 | </tr> |
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| 51 | <tr class="field"><th class="field-name">Created:</th><td class="field-body">25-Feb-2008</td> |
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| 52 | </tr> |
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| 53 | <tr class="field"><th class="field-name">Post-History:</th><td class="field-body"></td> |
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| 54 | </tr> |
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| 55 | </tbody> |
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| 56 | </table> |
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| 57 | <hr /> |
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| 58 | <p>The super-seed feature in S-5.5 and on is a new seeding algorithm designed to help |
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| 59 | a torrent initiator with limited bandwidth "pump up" a large torrent, reducing the |
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| 60 | amount of data it needs to upload in order to spawn new seeds in the torrent.</p> |
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| 61 | <p>When a seeding client enters "super-seed mode", it will not act as a standard seed, |
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| 62 | but masquerades as a normal client with no data. As clients connect, it will then |
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| 63 | inform them that it received a piece -- a piece that was never sent, or if all |
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| 64 | pieces were already sent, is very rare. This will induce the client to attempt to |
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| 65 | download only that piece.</p> |
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| 66 | <p>When the client has finished downloading the piece, the seed will not inform it of |
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| 67 | any other pieces until it has seen the piece it had sent previously present on at |
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| 68 | least one other client. Until then, the client will not have access to any of the |
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| 69 | other pieces of the seed, and therefore will not waste the seed's bandwidth.</p> |
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| 70 | <p>This method has resulted in much higher seeding efficiencies, by both inducing |
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| 71 | peers into taking only the rarest data, reducing the amount of redundant data sent, |
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| 72 | and limiting the amount of data sent to peers which do not contribute to the swarm. |
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| 73 | Prior to this, a seed might have to upload 150% to 200% of the total size of a |
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| 74 | torrent before other clients became seeds. However, a large torrent seeded with a |
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| 75 | single client running in super-seed mode was able to do so after only uploading |
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| 76 | 105% of the data. This is 150-200% more efficient than when using a standard seed.</p> |
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| 77 | <p>Super-seed mode is <em>NOT</em> recommended for general use. While it does assist in the |
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| 78 | wider distribution of rare data, because it limits the selection of pieces a |
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| 79 | client can downlad, it also limits the ability of those clients to download data |
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| 80 | for pieces they have already partially retrieved. Therefore, super-seed mode is |
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| 81 | only recommended for initial seeding servers.</p> |
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