Re: Performance of scp with OpenSSH - 5.1p1

On Mon, Aug 25, 2008 at 09:52:13PM +0530, S, Senthilprabu (NSN - IN/Bangalore) wrote:

With OpenSSH-5.1p1:-
------------------------
Protocol Time taken rate MB/s
Std. scp 53.7 19.3
scp -c arcfour 40.1 26.3
scp -c blowfish 55.5 18.6
scp -C 123.6 16.3


With OpenSSH-4.5p1:-
-------------------------
Protocol Time taken rate MB/s
Std. scp 59.9 17.9
scp -c arcfour 45 22.3
scp -c blowfish 59.6 17.1
scp -C 131 14.1

Let's reformat your data just a bit:

Protocol 4.5p1 MB/s 5.1p1 MB/s increase
---------- ---------- ---------- ----------
Std. scp 17.9 19.3 8%
arcfour 22.3 26.3 18%
blowfish 17.1 18.6 9%
scp -C 14.1 16.3 16%

I do not see any higher throughput (20%) with the 5.1p1 (with UMAC-64)
than 4.5p1. The above results clearly says it is not increasing the
performance by 20%. Did I something here?.

I'd say the 16% and 18% figures give reasonable credibility to the
"approximately 20% faster" claim.