tree 54f5934ee1229094e1161a2e846839bb182618b8
parent 3ccc7e5779793fd54564baf60c51bf017955e0ba
author Jason A. Donenfeld <Jason@zx2c4.com> 1524174412 +0200
committer Brad Fitzpatrick <bradfitz@golang.org> 1524176423 +0000

unix: avoid extra syscall on send/recvmsg on Linux

By simply rearranging the logic, we avoid the overhead of a superfluous
call to getsockopt. For, if p is already non empty, there's no point
in having to check if we need to attach dummy payload. This has
performance benefits when using send/recvmsg for high speed
communications.

Change-Id: If47ab5322464aad8e6d2603a369e95327223211f
Reviewed-on: https://go-review.googlesource.com/108337
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>