On Friday, June 13, 2003, at 12:52  PM, Jesse Off wrote:

> ack_on_push=1 sysctl on both computers, it takes 25
> seconds.  What seems to be happening is spurious .2
> second time spans where no packet is transmitted, then
> one machine sends an ack, then the two machines push
> 2-10 more packets then freeze again for another .2
> seconds.  I've attached a tcpdump snippet where the .2
> second spans are obvious.

Can you try setting the TCP_NODELAY socket option in the application, 
and see if that also improves the performance?

         -- Jason R. Thorpe <thorpej@wasabisystems.com>