[105224] in North American Network Operators' Group
Re: Best utilizing fat long pipes and large file transfer
daemon@ATHENA.MIT.EDU (Glen Turner)
Sun Jun 15 22:48:14 2008
Date: Mon, 16 Jun 2008 12:18:06 +0930
From: Glen Turner <gdt@gdt.id.au>
To: "Robert E. Seastrom" <rs@seastrom.com>
In-Reply-To: <86od66t9ru.fsf@seastrom.com>
Cc: nanog@merit.edu
Errors-To: nanog-bounces@nanog.org
Robert E. Seastrom wrote:
> As a user of hpn-ssh for years, I have to wonder if there is any
> reason (aside from the sheer cussedness for which Theo is infamous)
> that the window improvements at least from hpn-ssh haven't been
> backported into mainline openssh? I suppose there might be
> portability concerns with the multithreaded ciphers, and there's
> certainly a good argument for not supporting NONE as a cipher type out
> of the box without a recompile, but there's not much excuse for the
> fixed size tiny buffers - I mean, it's 2008 already...
Fedora 8 and 9 and Ubuntu 8.04 include the upstream OpenSSH which include
large window patches. OpenSSH 4.7 ChangeLog contains:
> Other changes, new functionality and fixes in this release:
...
> * The SSH channel window size has been increased, and both ssh(1)
> sshd(8) now send window updates more aggressively. These improves
> performance on high-BDP (Bandwidth Delay Product) networks.
Cheers, Glen
--
Glen Turner
