RE: Max tcp connections
Richard Gooch (rgooch@ras.ucalgary.ca)
Fri, 12 Nov 1999 08:40:55 -0700
David Schwartz writes:
>
> > David Schwartz wrote:
> > > > Signal based I/O is definitely the right approach for scaling
> > >
> > > I still find this very hard to believe. How can one
> > fast pass through poll
> > > (assuming a smarter implementation) be less efficient than the
> > OS sending me
> > > 5,000 signals? That strikes me as an incredible claim.
> >
> > Easy. The kernel doesn't send you 5,000 signals. If the
> > signal queue starts overflowing, it gives up and sends you
> > a single SIGIO, and you call poll().
>
> That's very cool. If you call poll with a timeout of zero, is
> it smart enough not to put you on any wait queues? That would be the
> best of all worlds.
Yes. I added that optimisation a couple of years ago, IIRC.
Regards,
Richard....
Permanent: rgooch@atnf.csiro.au
Current: rgooch@ras.ucalgary.ca
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