RE: ipsec null encryption slower than AES / was Re: 2.6 IPSec Throughput puzzle

From your numbers below it is clear all ipsec benchmarks have maxed out your
CPU, but aes/sha1 still has some hits in default_idle. Is this an SMP
system?

No, it is not running SMP kernel. (The system is SMP). 
About little time being sent in default_idle, I think,it was because I was little late in 
performing dump. I redid the test and the CPU was maxed out even in aes/sha1 case.
 

http://www.certconf.org/presentations/2004/Tuesday/TS2.pdf - the concept is
called 'the scatterlist'.
http://lwn.net/Articles/14010/?format=printable is also nice.

Thanks, for the pointers. I will see, if I can isolate the problem. 

Shekhar