[Bug 1332] New: Add ability to set TCP rcvbuf size

bugzilla-daemon at bugzilla.mindrot.org bugzilla-daemon at bugzilla.mindrot.org
Fri Jul 6 07:32:15 EST 2007


           Summary: Add ability to set TCP rcvbuf size
           Product: Portable OpenSSH
           Version: 4.6p1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: bitbucket at mindrot.org
        ReportedBy: imorgan at nas.nasa.gov

Created an attachment (id=1320)
 --> (http://bugzilla.mindrot.org/attachment.cgi?id=1320)
This adds a ReceiveBufferSize option to ssh(1)

For high-BDP connections, it may be necessary to increase the size of
the TCP rcvbuf in order to get good performance. In some cases, this 
can be accomplished by adjusting a kernel setting or using an
kernel. However, these are not always viable options.

In some cases the TCP rcvbuf must be set to multiple megabytes in order
to accomodate high-latency connections. It's not always practical or
desirable to do this for all connections. And autotuning support
that a recent Linux kernel or a custom-built kernel is being used,
is not always the case.

To address the case where it is not practical to increase the system's
default rcvbuf size or use an autotuning kernel, it would be helpful
if ssh could adjust the size on a per connection bases.

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