In-kernel web server
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An in-kernel web server is an unlimited HTTP server that runs in kernel space or equivalent. Also called "accelerator".
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[edit] Benefits
- Performance. The path taken by data from disk to network. Proper asynchronous zero-copy interfaces would make this available from user-space.
- Scalability with respect to number of simultaneous clients. Event notification of comparable scalability seems unlikely in user-space1.
[edit] Drawbacks
- Security
- Portability. Every kernel needs a specific implementation route.
- Reliability. Failure in the webserver may crash the OS.
[edit] Implementations
- Solaris/NCAkmod
- HP-UX/NSAhttp
- Linux/khttpd
- Linux/TUX
- Windows NT/http.sys (part of IIS)
- SPIN/http
- OpenVMS/WASD.trap