On Fri, 19 Aug 2011, Lev Serebryakov wrote:

Our network stack is actually pretty parallel as such things go, and there are a number of changes in FreeBSD 9.x that extend this work. Most of the performance work is being done on edge nodes rather than middle nodes -- i.e., maxing out multiple 10gbps links serving content, etc, rather than in routing configurations, though. We also have a strong and growing collection of 10gbps drivers. You'll find our drivers lifted for many other systems, including Solaris :-).

There are a few known issues in terms of parallelism -- one is contention between the ithread and user thread on per-TCP connection locks. Another is that we still haven't managed to switch to per-CPU statistics for the network stack (which is fairly straight forward in a specific sense, but we'd like a proper abstraction for it so we can generalise).

Robert