To achieve the best latency results FeedEngine provides a mode where Solarflare's ultra-low latency ef_vi API is used.
ef_vi grants an application direct access to the Solarflare network adapter datapath to deliver lower latency and reduced per-message processing overheads. It can be used directly by applications that want the very lowest latency send and receive API, and that does not require a POSIX socket interface.
To enable ef_vi mode a correspondent setting must be provided along with others.
It is recommended to upgrade adapter's firmware to the latest one (sfupdate) and choose 'Full feature' firmware variant (sfboot –adapter=xxx firmware-variant=full-feature). Please refer to Solarflare Linux Utilities for more details.
Before running the app in ef_vi mode please run: