In article <local.mail.freebsd-hackers/19990909003757.66140.qm...@scam.xcf.berkeley.edu> you write: >There is alot of talk going on over at the linux-kernel mailing list >about implementing synchronous messaging for I/O. They are talking about >a paper that was presented at USENIX: > > http://www.cs.rice.edu/~gaurav/papers/usenix99.ps > >The general idea is that select() and poll() fall over with large numbers of >file descriptors for two reasons. First, scanning the interest list begins to >consume more time. Second, the stateless nature between calls means that >alot of redundant processing occurs. The solution these guys (the authors) >say is to have a way of registering interest in descriptors, then you can >call a procedure to find out what has changed since last time. > >I personally think that select() is just fine and can be implemented >more efficiently than currently, but I would be willing to give it a shot >at both cooperating with the Linux people to get a good Linux/FreeBSD >API layed down and then implementing it. > >I know some of you heard this paper presented so does anybody have any >ideas about it?
Yes. I don't particularly like some of the things in the paper, although it does have several good concepts. I have an implementation that does exactly this, and have a line on two other implementations that do the same thing (but in a different fashion). Unfortunately, all of these are somewhat problem-specific and are not a general solution. I've spent some time working on a generic implementation that draws its ideas from several places. I hope to be in a position where I can work on this almost full time within a month. -- Jonathan To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
