[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.

[Lukas Larsson]

The code change is this: https://github.com/erlang/otp/commit/689ba6e5657867eb3efbcb9a2dbec4aa98ddac5d

Essentially it does a read to check if there is any data available right away and if there is none does a driver_select. Before the change it always went directly to driver_select.

Lukas

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