https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206716
Bug ID: 206716
Summary: HPN-SSH: getsockopt(SO_SNDBUF) returns high watermark,
not setsockopt(SO_SNDBUF)
Product: Base System
Version: 10.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
CC: [email protected]
getsockopt(SO_SNDBUF) does not return the value set by getsockopt(SO_SNDBUF).
HPN-SSH would like to determine the value set by setsockopt(SO_SNDBUF) so that
it can fill it up. This helps to use more bandwidth on a high BDP link.
HPN-SSH tries to determine this value by periodically calling
getsockopt(SO_SNDBUF) at [1]. However, on FreeBSD, getsockopt(SO_SNDBUF) does
not return the value set by setsockopt(SO_SNDBUF). Rather it returns the "high
watermark".
The net result is that on high BDP links, HPN-SSH does nothing to increase
bytes-in-flight.
[1] /usr/src/crypto/openssh/roaming_common.c line 59 in get_snd_buf_size:
getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optvallen)
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