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SubjectRe: > 15,000 Simultaneous Connections
Mike Jagdis wrote:
>
> On Wed, 15 Sep 1999, Stephen C. Tweedie wrote:
>
> > The cost per fd is miniscule.
>
> Taking the 15000 fds in the subject select would need to do a
> 4 page kmalloc and the current poll would do a 32 page kmalloc.
> Then you have to loop over all the descriptors calling their poll
> handlers.
>
> Incidentally, it looks like there is a possible DoS with queued
> signals. If you flood the queue with signals but keep them blocked
> no one else will get a look in.

Yeah, per-user/per-process limits need to be implemented. In fact, there are a
lot of resources which should have per-system, per-user, per-process, and
per-group limits put in. Sounds like a good project for a someone.


Jordan

--
Jordan Mendelson : http://jordy.wserv.com
Web Services, Inc. : http://www.wserv.com

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