only 11Mb/s with bcm43xx on F5?[Scanned]

[Ed Kim]

James Wilkinson wrote:
> James Pifer wrote:
>> I used scp and the results were rather disappointing. Using scp I had
>> the following results:
>>
>> 11Mb/s - scp would go around 815K 
>> 54Mb/s - scp would go around 1.1MB
>> 10/100 NIC - scp would go around 6.4MB
> 
> General note: scp is great for real-life use over unprotected networks.
> But because there is the overhead of encryption and decryption, scp can
> be limited by processor power at one end or the other of a link, rather
> than raw throughput (especially if the network card itself requires a
> lot of processor time to do its stuff). This means it's not the best
> choice for measuring anything other than scp throughput.
> 
> James.

It has been my experience that the overhead of encryption for SCP does 
not come into play in the standard distribution of OpenSSH, but rather 
is limited by the SSH buffer sizes.  Using the HPN-SSH patch 
(www.psc.edu/networking/projects/hpn-ssh/), I've gotten exponential 
increases in scp throughput...

-- 
Ed Kim, RHCE
http://www.rhatbox.com