[Bug 235333] SSH data transmission speed unnecessarily slow due to IPQoS default setting

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235333

            Bug ID: 235333
           Summary: SSH data transmission speed unnecessarily slow due to
                    IPQoS default setting
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: conf
          Assignee: bugs at FreeBSD.org
          Reporter: tony at accesslab.com

On certain connections, for example through some wireless devices, FreeBSD
ssh/scp will copy data very slowly. Typically I see copy rates at 1/3 normal
speed. This is happening because the IPQoS option for both ssh/scp (ssh_config)
and sshd (sshd_config) default the IPQoS setting to 'af21'. Changing this
setting to instead default to 'lowdelay' will produce normal data transmission
speeds out-of-the-box for new FreeBSD installs thus making many users happier
not having to trouble shoot and track down this weird random problem when it
occurs. The low speed transmission issue only occurs on some connection paths,
mostly I have seen it happen when copying data through a wireless bridge or
access point. In hind sight, I see that on Linux, Openssh DOES default IPQoS =
lowdelay, and perhaps that is not by accident?

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