increasing the write block size for high latency

Dan Stromberg drsalists at
Sat Jul 26 12:53:38 MDT 2014

On Tue, Jul 8, 2014 at 8:07 AM, Adam Edgar <aedgar at> wrote:
> It seems the issue is indeed in the ssh layer. scp has the same issue and some work has been done in “fixing” that:
> From the papers abstract:
>         SCP and the underlying SSH2 protocol implementation in OpenSSH is network performance limited by statically defined internal flow control buffers. These buffers often end up acting as a bottleneck for network throughput of SCP, especially on long and high bandwith network links.

It's a bit hard to believe that PSC's performance patches still
haven't been merged.

More information about the rsync mailing list