Multiple netgraph threads

[Hans Petter Selasky]

Hi,

Have you thought about nodes that lock the same mutex must be run on the same 
thread else for example one thread will run while another will just waits for 
a mutex ?

You can achieve this by grouping nodes into a tree, and the node at the top of 
the tree decides on which thread the nodes in the tree should be run.

How does your patch handle this ?

Also see recent discussion about multithreaded callouts 
on "freebsd-arch at freebsd.org". Subject "timeout/callout small step forward".

--HPS

On Sunday 30 March 2008, Alexander Motin wrote:
> Hi.
>
> I have implemented a patch (for the HEAD) making netgraph to use several
> own threads for event queues processing instead of using single swinet.
> It should significantly improve netgraph SMP scalability on complicated
> workloads that require queueing by implementation (PPTP/L2TP) or stack
> size limitations. It works perfectly on my UP system, showing results
> close to original or even a bit better. I have no real SMP test server
> to measure real scalability, but test on HTT CPU works fine, utilizing
> both virtual cores at the predictable level.
>
> Reviews and feedbacks are welcome.
>
> URL: http://people.freebsd.org/~mav/netgraph.threads.patch