Multiple netgraph threads

[Julian Elischer]

Alexander Motin wrote:
> Hi.
> 
> Vladimir V. Kobal wrote:
>> I'm interested in the information of further development of Subject. I have
>> a bottleneck: swi_net limited by one CPU core time. There was a thread
>> http://lists.freebsd.org/pipermail/freebsd-net/2008-March/017447.html .
>> Patch http://people.freebsd.org/~mav/netgraph.threads.patch is not available
>> :(. Could somebody mail it to me. Are there any other similar patches?
> 
> I have uploaded that patch back. Not sure is it correct at this moment,
> there was some changes, but that time it worked fine.
> 
> I have measured some benefit on my tests with Core2Quad using NetPerf
> cluster. But even having all 4 cores busy, I have got just only about
> 20% performance benefit on that test setup (routing between three
> Gigabit PPTP links). I suppose it was result of constant cache trashing,
> when the same netgraph nodes write-accessed by different CPUs. But may
> be on more diverse workload, or with some heavy compression/encryption
> used benefit can be bigger.
> 


I would like to see this work followed through..