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mention mixed mode in tuning guide

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Arvid Norberg 2011-01-29 10:17:17 +00:00
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docs/tuning.rst
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@ -283,6 +283,24 @@ the same pieces, and on the other hand assume that they won't request the same p
and drop them when the first peer requests it. To enable volatile read cache, set
``session_settings::volatile_read_cache`` to true.
uTP-TCP mixed mode
------------------
libtorrent supports uTP_, which has a delay based congestion controller. In order to
avoid having a single TCP bittorrent connection completely starve out any uTP connection,
there is a mixed mode algorithm. This attempts to detect congestion on the uTP peers and
throttle TCP to avoid it taking over all bandwidth. This balances the bandwidth resources
between the two protocols. When running on a network where the bandwidth is in such an
abundance that it's virtually infinite, this algorithm is no longer necessary, and might
even be harmful to throughput. It is adviced to experiment with the
``session_setting::mixed_mode_algorithm``, setting it to ``session_settings::prefer_tcp``.
This setting entirely disables the balancing and unthrottles all connections. On a typical
home connection, this would mean that none of the benefits of uTP would be preserved
(the modem's send buffer would be full at all times) and uTP connections would for the most
part be squashed by the TCP traffic.
.. _`uTP`: utp.html
send buffer low watermark
-------------------------