In-kernel web server
An in-kernel web server is a (possibly limited) HTTP server that runs in kernel space or equivalent. Also called "accelerator".
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 impossible in user-spaceTemplate:Fn.
Drawbacks
- Security
- Portability. Every kernel needs a specific implementation.
- Reliability. Failure in the webserver may crash the OS.
Implementations
- Solaris/NCAkmod
- HP-UX/NSAhttp
- Linux/khttpd
- Linux/TUX
- Windows NT/http.sys (part of IIS)
- SPIN/http
- OpenVMS/WASD.trap
See also
References
- Template:FnbCITI_TR_00-4
- High-Performance Memory-Based Web Servers: Kernel and User-Space Performance. Philippe Joubert, Robert B. King, Rich Neves, Mark Russinovich, John M. Tracey. IBM. T. J. Watson Research Center
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