Best utilizing fat long pipes and large file transfer
Glen Turner
gdt at gdt.id.au
Mon Jun 16 02:48:06 UTC 2008
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
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