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added send buffer watermark to tuning docs

This commit is contained in:
Arvid Norberg 2009-08-24 03:55:59 +00:00
parent 9ba0148910
commit bc21e59a81
1 changed files with 14 additions and 0 deletions
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docs/tuning.rst
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@ -221,6 +221,20 @@ In order to increase the possibility of read cache hits, set the
``session_settings::cache_expiry`` to a large number. This won't degrade anything as
long as the client is only seeding, and not downloading any torrents.
send buffer low watermark
-------------------------
libtorrent uses a low watermark for send buffers to determine when a new piece should
be requested from the disk I/O subsystem, to be appended to the send buffer. The low
watermark is determined based on the send rate of the socket. It needs to be large
enough to not draining the socket's send buffer before the disk operation completes.
The watermark is bound to a max value, to avoid buffer sizes growing out of control.
The default max send buffer size might not be enough to sustain very high upload rates,
and you might have to increase it. It's specified in bytes in
``session_settings::send_buffer_watermark``. The ``high_performance_seed()`` preset
sets this value to 5 MB.
peers
-----