2 questions:
1) would this work with mosh? 2) lzo/lz4 has lower latency then zip, is there an ssh patch supporting this and would it be noticable in a 2k4 scenario?
HPN-SSH: High Performance ssh and scp
11–20 of 32 posts
Re: HPN-SSH: High Performance ssh and scp
#122 questions: 1) would this work with mosh? 2) lzo/lz4 has lower latency then zip, is there an ssh patch supporting this and would it be noticable in a 2k4 scenario?
I don't think mosh-type scenarios are what HPN-SSH aims to improve. It is more targeted at high-bandwidth, high-latency scp transfers.
(say, 300Mb+ connections with 30ms+ latency)
Re: HPN-SSH: High Performance ssh and scp
#13I've been using this a lot recently - https://github.com/LabAdvComp/UDR - A UDT wrapper around rsync - No need to patch anything, therefore no maintenance woe
Re: HPN-SSH: High Performance ssh and scp
#14They apply cleanly when building for OSX and work well with the Homebrew patches infrastructure. Get them with
brew install --with-hpn https://raw.githubusercontent.com/FiloSottile/homebrew-dupes/423f9eed0e557f4a63947b04f5dbe22c895ff6f7/openssh.rb
brew tap homebrew/dupes
brew install --with-hpn openssh
Re: HPN-SSH: High Performance ssh and scp
#152 questions: 1) would this work with mosh? 2) lzo/lz4 has lower latency then zip, is there an ssh patch supporting this and would it be noticable in a 2k4 scenario?
mosh uses a completely different protocol (over UDP), and I think the aim of these patches is to improve throughput, not latency, of SSH. In a high performance situation you probably have high bandwidth, and then it's better to disable any compression. Compression only makes sense when you have limited bandwidth and sufficient CPU power.
Re: HPN-SSH: High Performance ssh and scp
#16They apply cleanly when building for OSX and work well with the Homebrew patches infrastructure. Get them with brew install --with-hpn https://raw.githubusercontent.com/FiloSottile/homebrew-dupes/423f9eed0e557f4a63947b04f5dbe22c895ff6f7/openssh.rb Or, once the PR https://github.com/Homebrew/homebrew-dupes/pull/358 is merged, brew tap homebrew/dupes brew install --with-hpn openssh EDIT: fix, thanks dkubb
Did you mean "brew install --with-hpn openssh"?
Re: HPN-SSH: High Performance ssh and scp
#17check out bbcp if you are interested as well.
Do you mean bbftp?
Re: HPN-SSH: High Performance ssh and scp
#18I'm drooling over this. Will this ever show up in RedHat?
Not likely. The OpenSSH team is very conservative, and RedHat isn't likely to make such an invasive change into a core utility.
PSC has been maintaining these patches for a long time. I'm pretty sure I was using this nearly 10 years ago. If you have a need for this, it's not hard to build it yourself.
Ah, found the initial release date: July 7, 2004; yeah 10 years.
Re: HPN-SSH: High Performance ssh and scp
#19I wonder what the current performance difference is to OpenSSH6.1+? I think those graphs they have might be very old, and there's been a lot of improvements in the core OpenSSH code since then.
Re: HPN-SSH: High Performance ssh and scp
#20Gentoo has this as a USE flag for openssh and is enabled by default. Be aware that the multithreaded AES-CTR patch has compatibility conflicts with some libssh versions and possibly other implementations. XBMC and Synology in particular have both been unable to connect to servers using that patch.