# F-Stack/f-stack

F-Stack is an user space  network development kit with high performance based on DPDK, FreeBSD TCP/IP stack and coroutine API.

Repository: https://github.com/F-Stack/f-stack
Canonical: https://ross.abutalabs.com/products/f-stack
Homepage: http://www.f-stack.org
Language: C
License: NOASSERTION
License Family: other
Last push: 2026-08-24T07:58:46+00:00

## Health v2 (maintenance only)
Score: 84/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 55, longevity 100
- inputs: {"age_days": 3429, "days_push": 9, "days_rel": 302, "gap_med": 0, "n_releases_24m": 4}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4254, forks 962 (observed 2026-08-28T04:08:40.484480+00:00)

## What it is
F-Stack is an open-source high-performance user-space network framework based on DPDK, featuring a ported FreeBSD 11 TCP/IP stack, a Posix-like socket/epoll/kqueue API, and a coroutine SDK. It enables kernel-bypass networking for applications like Nginx and Redis, achieving millions of concurrent connections and RPS.

## Use cases
- build a high-performance HTTP server that bypasses the Linux kernel
- run Redis or Nginx with DPDK kernel-bypass networking
- handle millions of concurrent TCP connections on 10G+ NICs
- port an existing epoll-based C application to user-space networking
- implement a high-QPS DNS or proxy server
- avoid kernel packet copying, syscalls, and interrupt overhead

## When to choose
- you need maximum packet throughput or connection density beyond what the Linux kernel delivers
- you have existing epoll/kqueue or socket-based C applications you want to accelerate
- you can dedicate NICs to DPDK and deploy on bare metal Linux servers

## When to avoid
- your workload is low-traffic or not network-bound
- you need kernel features like netfilter, routing daemons, or standard tooling on the accelerated NIC
- you cannot control the deployment environment (e.g., shared cloud VMs without DPDK-capable NICs)
- your stack is in a language other than C/C++ without binding effort

## Facets
- artifact type: framework
- maturity: stable
- function: networking, http-server, concurrency, developer-tools
- domain: networking, performance, backend, microservices
- platform: c, cpp
- tags: dpdk, kernel-bypass, freebsd-tcpip, user-space-network-stack, high-performance, coroutines, epoll, kqueue, nginx, redis, linux

## Member repositories
- F-Stack/f-stack (main) score 84

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:40.484480+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:09.119761+00:00, confidence not recorded.
  - readme: https://github.com/F-Stack/f-stack (fetched 2026-08-28T04:08:40.484480+00:00, sha 8a1e56893161)
  - homepage: http://www.f-stack.org (fetched 2026-08-29T09:11:47.968947+00:00, sha f54c7b23a93e)
  - site_page: http://www.f-stack.org/about.html (fetched 2026-08-29T09:11:47.978332+00:00, sha 0566fd5056b1)
- Data as of 2026-08-30T08:39:29.467469+00:00.