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: [email protected]
Reporter: [email protected]
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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