similar to: New HPN patch released for 3.9

The HPN12 patch available from http://www.psc.edu/networking/projects/hpn-ssh addresses performance issues with bulk data transfer over high bandwidth delay paths. By adjusting internal flow control buffers to better fit the outstanding data capacity of the path significant improvements in bulk data throughput performance are achieved. In other words, transfers over the internet are a lot

Howdy, As a note, we now have HPN patch for OpenSSH 4.2 at http://www.psc.edu/networking/projects/hpn-ssh/ Its still part of the last set of patches (HPN11) so there aren't any additional changes in the code. It patches, configures, compiles, and passes make tests without a problem. I've not done extensive testing for this version of openssh but I don't foresee any problems. I

Hi, http://www.psc.edu/networking/projects/hpn-ssh/ Clearly, the HPN patches significantly boost throughput performance. This enhancement is entirely from tuning the SSH buffer sizes. Alex Tavcar

http://www.psc.edu/networking/projects/hpn-ssh/ Mike Stevens and I just released a new set of high performance networking patches for OpenSSH 3.9p1, 4.0p1, and 4.1p1. These patches will provide the same set of functionality across all 3 revisions. New functionality includes 1) HPN performance even without both sides of the connection being HPN enabled. As long as the bulk data flow is in the

The results, for anyone interested, can be found here http://www.psc.edu/networking/projects/hpn-ssh/results.html Long story short, there doesn't seem to be any notable difference between the two anymore. I still have a few more test combinations to run (<.5ms rtts and against cygwin) so the conclusions might change but, at this point, I'm no longer seeing any sort of performance

Hello, I know that this has been asked before, just wanted to mention that I, too, would like to see the HPN SSH functionality incorporated in the standard OpenSSH. Would there be technical disadvantages integrating the changes? I know we are all pretty busy, but I would certainly spend time to help, e.g. with testing, documentation, etc. Cheers --pwo -- Peter W. Osel - http://pwo.de/ - pwo

Hello Are there plans to merge the hpn-ssh (http://www.psc.edu/networking/projects/hpn-ssh/) and the LPK (http://code.google.com/p/openssh-lpk/) into the mainline openssh. Adding lpk has been logged as a bug in bugzilla as They are two patches that I always apply as the performance boost from hpn-ssh is substantial to say the least, and centralisation of the authorized_keys into a LDAP server

On multiple core systems OpenSSH is limited to using a single core for all operations. On these systems this can result in a transfer being processor bound even though additional CPU resources exist. In order to open up this bottleneck we've developed a multi-threaded version of the AES-CTR cipher. Unlike CBC mode, since there is no dependency between cipher blocks in CTR mode we

[NB: General information regarding HPN-SSH can be found at http://www.psc.edu/networking/projects/hpn-ssh ] This is a beta release of HPN12 but I'd like to get some user experiences with it if anyone is so inclined. This version of the HPN patch more closely conforms to the openssh nomenclature and coding style, it eliminates the use of command line switches in favor of -o options, it

Dear CentOS lovers, Could you consider to include a patch, http://www.psc.edu/networking/projects/hpn-ssh/ for openssh maybe as CentosPlus packages? It has great speed impact for long-distance ( high delay ) transfer. Regards, Yuji Tsuchimoto

Hi, I tried different encryptions like arc four, but always with the same result. BTW: googling shows some similar questions and they are stuck on set same speed +-. But non of that solutions helped me. /G?tz > Am 11.08.2015 um 12:14 schrieb Eero Volotinen <eero.volotinen at iki.fi>: > > Usually problem in encryption. > > try cipher arcfour or apply hpn patches to

We see absolutely dismal performance from Canberra to Perth via Aarnet or Grangenet (gig connections across the country). With standard rsync on a tuned tcp stack, we see about 700k/s. I started playing with the --sockopts and have increased the performance to 1.4M/s which is better, but still way off the pace. There are similar patches for ssh at

The HPN patch set has been updated to work with OpenSSH4.6. This patch can help improve performance of bulk data transfers when using SSH, SCP, or SFTP. Please see http://www.psc.edu/networking/projects/hpn-ssh for more information. The patch is available from the above address or directly with http://www.psc.edu/networking/projects/hpn-ssh/openssh-4.6p1-hpn12v16.diff.gz If you have any

Hello, I know this has come up before; but is the HPN patch (or elements thereof) currently being considered for integration in to the OpenSSH code base? Are there pending issues (buffer management, none cipher, etc) which still need to be addressed? We have been using HPN-SSH for over a year now, and like others, have observed significant performance improvement over standard OpenSSH. I can

This is a preliminary release and as such should be used at your own risk. In my testing the application builds under OS X and Linux, passes the regression tests, and file transfer tests on our test connections exhibited a 1600% increase in performance (1.4MB/s versus 20.9MB/s 46ms RTT). This patch (hpn12v10) is available from

https://www.psc.edu/networking/projects/hpn-ssh/hpn-v-ssh-tput.jpg "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. Modifying the ssh code to allow the buffers

http://www.psc.edu/networking/projects/hpn-ssh There have been some changes to the command line switches which are detailed on the website. This is more of a stop gap release than anything else. This is still in the HPN-11 cycle of patches. We hope to have an update to HPN-12 out sometime in March (when I can get some freetime). This will conform more closely to the OpenSSH nomenclature and

Hello list, right now SSH Tunnel / scp is reaches just around 76Mb/s on my E5 Xeon using AES-NI but openssl reaches around 600-700Mb/s using 128aes-cbc cipher. As far as i understand http://www.psc.edu/index.php/hpn-ssh this is due to very small buffers in ssh / scp. Is there any work on this? Like autotuning the buffer size? Are there plans to integrate the hpn patches? Greets, Stefan

We have developed a patch that enables changing the SSH window size using the tcp window size as the source. This allows SSH to obtain maximum use of the bandwidth on high BDP links. We also have a page that describes the changes and performance. http://www.psc.edu/~rapier/hpn-ssh/ The patch against CVS is included here. Common subdirectories: src/usr.bin/ssh/CVS and ssh/CVS diff -u

HPN-SSH is a set of high performance patches which add dynamic window sizing, none cipher switching, enhanced server logging, and a multi-threaded cipher implementation to OpenSSH. We've just updated the patches to the OpenSSH 4.9 release and made them available from http://www.psc.edu/networking/projects/hpn-ssh/ Comments, questions, and criticisms are always welcome. Thanks for your