Messages in this thread | | | Date | Tue, 2 Mar 1999 23:41:28 -0600 (CST) | From | Oliver Xymoron <> | Subject | Re: OSDI paper - IO-Lite: A Unified I/O Buffering and Caching System |
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On Tue, 2 Mar 1999, Jim Gettys wrote:
> It shows a new I/O approach that is very general and flexible, and avoids > data copies with minimal overhead, even between processes. The authors > use as an example Web service, and show very good performance gains.
Very interesting. We probably wouldn't see quite the gains the author saw with his FreeBSD implementation. It's a good match for FreeBSD as it already has a zero-copy scheme in a lot of areas and fits better with their design philosophy. Linux largely avoids VM manipulations like those suggested for instance by I/O-Lite's IPC scheme, because of their nasty effect on CPU caches, SMP scaling, etc. So parts of it are going to be a hard sell. And we've got sendfile(2) now, which is not nearly as pretty or generic, but might still give similar performance at least for the common web server case.
-- "Love the dolphins," she advised him. "Write by W.A.S.T.E.."
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