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Date: Sat, 18 Oct 2014 10:21:02 -0700
Message-ID: <CAOjFWZ4EndnanZ_oyMeA9bH+xxTZ+J8mnJtTdvBjTMYvUsXr2w@mail.gmail.com>
Subject: Re: ssh None cipher
From: Freddie Cash <fjwcash@gmail.com>
To: Mark Martinec <Mark.Martinec+freebsd@ijs.si>
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On Oct 18, 2014 3:54 AM, "Mark Martinec" <Mark.Martinec+freebsd@ijs.si>
wrote:
>
> If the purpose of having a none cipher is to have a fast
> file transfer, then one should be using  sysutils/bbcp
> for that purposes. Uses ssd for authentication, and
> opens unencrypted channel(s) for the actual data transfer.
> It's also very fast, can use multiple TCP streams.

That's an interesting alternative to rsync, scp, and ftp, but doesn't help
with zfs send/recv which is where the none cipher really shines.

Without the none cipher, SSH becomes the bottleneck limiting transfers to
around 400 Mbps on a gigabit LAN. With the none cipher, the network becomes
the bottleneck limiting transfers to around 920 Mbps on the same gigabit
LAN.

This is between two 8-core AMD Opteron 6200 systems using igb(4) NICs.