Existing performance enhancing mechanisms such as TCP auto-tuning or programmatic async(epoll, etc) events such as "ready to send" help applications to sustain high throughput even under high Bandwith-Delay product scenarios.

But: the folks at the Tor project have found that when you have thousands of active TCP sockets transmitting high volumes of data, many of which are simultenous (as it is the case in Tor anonymity network) then these mechanisms are insufficient. Local buffer bloat becomes a hindrance.

In this talk, David Goulet and Rob Jansen introduce a new async event that helps applications overcome these issues. The new event supplements and extends the current write "ready to send" event that triggers when a socket buffer has free space.

David and Rob will present data and go into more detailed description of the problem and then show the effect that such a change could have on performance through a small scale simulation.

More info: https://netdevconf.info/0x14-staging/session.html?talk-reducing-kernel-queui...

Reminder, registration is now open and early bird is still in effect. https://netdevconf.info/0x14/registration.html

cheers, jamal