The first server built using our new abstractions is a HTTP server called Cheetah. We have observed order of magnitude increases in small web document throughput on the same hardware when comparing Cheetah running on an exokernel to Harvest or NCSA running on general-purpose OSs (Ultrix when the platform is a MIPS box and OpenBSD when the platform is an x86 box). Large document throughput increases by a factor of four.
This is work in progress. We published a position paper on a new OS architecture for servers. We also gave a work-in-progress talk at the 1996 OSDI conference. The corresponding abstract and slides are available on-line.