[erlang-questions] Latency when using the active_once option in gen_tcp communication is reduced in R15B02. What is the details?

[skyman]

Hi everybody,
I find this in the R15B02 readme(http://www.erlang.org/download/otp_src_R15B02.readme):
OTP-10055  Latency when using the active_once option in gen_tcp
	            communication is reduced.

I'd know the details about this, can the man in the OTP team or other man explain this? Thanks.
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