In-kernel web server

In-kernel web server

An in-kernel web server is an unlimited 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 unlikely in user-spacefn|1.

Drawbacks

*Security: Kernel processes run with unlimited privileges.
*Portability. Every kernel needs a specific implementation route.
*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

*Comparison of web servers

References

*fnb|1 [http://www.citi.umich.edu/techreports/reports/citi-tr-00-4.pdf CITI_TR_00-4]
* [http://usenix.org/events/usenix01/full_papers/joubert/joubert.pdf 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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