On Sat, Feb 04, 2006 at 11:25:15AM +0000, Stuart Henderson wrote: > On 2006/02/03 20:34, Josh Tolley wrote: > > All that being said, we 1) didn't have an encryption accelerator > > in the box > > that would tend to make things worse anyway - you'll just increase the > rate of interrupts and that seems to be the main problem. >
If you plan to do extensive crypto on a soekris then you better add an encryption accelerator to the box because the little CPU is not capable of doing more than 8MB of AES-128 per second (tested via openssl speed). With scp I never got more than 1MB/s throughput. The soekris has such a slow CPU that any kind of work is expensive. Forwarding packets does not need a lot of CPU power and even in this case the soekris CPU is maxed out. In this specific case it seems that the interrupt processing spends the most time on the CPU (so one should try to optimise that part to get more forwarding speed). -- :wq Claudio
