X-Spam-Check-By: sourceware.org To: cygwin AT cygwin DOT com From: "Cary Jamison" Subject: Re: How to improve scp speed? Date: Wed, 30 Nov 2005 12:55:28 -0700 Lines: 23 Message-ID: References: <61f6f4390511281238o1e512ef8i14647828fcf32c AT mail DOT gmail DOT com> <438D6EE0 DOT 1000406 AT gmx DOT de> X-IsSubscribed: yes Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com In news:438D6EE0 DOT 1000406 AT gmx DOT de, Holger Krull typed: > The low speed of ssh and scp is not because of the encyption. > The problem is the 64K limit for the window size in the protocoll. > Further information and a patch can be found here: > > http://www.psc.edu/networking/projects/hpn-ssh/ I think we all know that encryption is a factor. The site still states : The improvement will also be highly influenced by the capacity of the processor to perform the encryption and decryption. Less computational expensive ciphers will often provide better throughput than more complex ciphers. And they add a new '-z' switch to get higher throughput without encryption. But, it is interesting to see how much more throughput they get with their buffer tuning. Cary -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/