More SSL_read() to fill big buffer Once SSL_read() only get max 16K bytes (one TLS record). In case of big buffer, should more SSL_read() to fill the buffer. Using sample https-client to measure max income MBit/s via nload tool. Note: set bufferevent_set_max_single_read() by 32K and add the chunk callback to read out each piece of data. The client sample do https request a data 900KB (the server don't use Transfer-Encoding: chunked) - With origin/master: max income is 2.26 MBit/s The chunk callback never get a piece of data > 16K. - With this PR: max income is 2.44 MBit/s The chunk callback can get some piece of data 32K or more.