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From: Pedro Roque Marques <roque@di.fc.ul.pt>
Newsgroups: comp.os.linux.networking,comp.unix.bsd.netbsd.misc,comp.unix.bsd.freebsd.misc
Subject: Re: TCP latency
Date: 14 Jul 1996 21:42:11 +0100
Organization: Faculdade de Ciencias da Universidade de Lisboa
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>>>>> "John" == John S Dyson <dyson@indy.celebration.net> writes:
[snip]
John> You are alluding to the
John> issue that I am concerned about. It is that the no-load
John> latency figures don't consider the potential performance hit
John> of even reasonably large number connections. Also, the
John> lat_tcp benchmark hasn't shown any kind of real world
John> performance that I see that most of the users of FreeBSD are
John> interested in.
John> I feel that the issue of scalability
John> is starting to be understood and acknowleged. He got up to
John> three processes, but it still isn't in the area where TCP
John> scalability issues come in to play. I really don't think
John> that the issue of scalability had been considered before, or
John> why was the three process test even presented? :-).
John> Honestly, even I didn't think that the Linux code would have
John> gotten very slow at three connections to localhost... I
John> wouldn't even think that a primitive TCP package would be
John> affected by three connections (actually six, if you consider
John> both sides.)
John> I think that it is best to put this discussion aside until
John> some benchmarks are run under controlled circumstances, by
John> unbiased parties, and with benchmarks that actually measure
John> something that people generally need. This thing is
John> degrading all the way, bordering on teasing by running a
John> scalability benchmark with three :-) connections...
John,
what are the precise mechanisms and design decisions in BSD networking that
make it's TCP scalable ?
Can you argue that BSD TCP is inherently more scalable that Linux's ? Or even
that is prepared for large servers ?
(please do focus your answer on TCP)
thanks,
./Pedro.