OpenSSH performance with VIA padlock

Iain Morgan imorgan at
Wed Nov 19 03:47:58 EST 2008

On Tue, Nov 18, 2008 at 17:28:11 +0200, Jan Klod wrote:
> Hello list,
> please spend a minute considering these facts and maybe there is something to 
> improve:
> 1) VIA Eden based board can write AES256 encrypted information on HDD at > 
> 60MB/s
> 2) iperf shows NIC speed 69MB/s
> 3) openssl tests have even better results
> 4) openssh can transfer AES256 encrypted information at < 27MB/s (and worse 
> with HDD encryption)
> It is better with openssh 5.x, than 4.6, but still I see no reason why results 
> are so bad... Please, could someone explain? I don't believe, padlock is used 
> properly...
> Jan

Remember, cycles are also taken up by the message digest. You don't
mention which MAC you are using nor do you give any of the OpenSSL speed
numbers for AES or any of the digests.

Also, what performance do you get for a memory-to-memory transfer over
the loopback?

Iain Morgan

More information about the openssh-unix-dev mailing list