On Thu, Oct 17, 2002 at 11:29:28AM +0900, Hyochang Nam wrote:

Many people helped me to solve the interrupt distribution problem.
We tested the throughput of Layer 3 forwarding on a SMP machine
which equips two Zero proessor(2Ghz). This is our results:
  -------------------------
       SMP    |  No SMP
  -------------------------
    230 Mbps  | 330 Mbps
  -------------------------

There is something called 'irq affinity' which may be interesting for you.
See here: http://www.dell.com/us/en/esg/topics/power_ps1q02-morse.htm

/proc/irq/?/smp_affinity

I expected that the SMP might show better throughput than "NO SMP"
environments. But, contrary to my expectation, SMP showed poor results. 
I don't know what is my fault in the experiments.

SMP is not always a win.

Regards,

bert hubert

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