[issue2523] binary buffered reading is quadratic

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Thanks for the fixes.

By the way, I don't know much about non-blocking streams, but it seems
to me that "optimal" non-blocking read() would require that the chunks
we ask to the OS are block-aligned, which is not the case currently (we
use 2*avail, which can be an arbitrary value).

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<http://bugs.python.org/issue2523>
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