From owner-freebsd-net  Wed Oct 10 10:20:56 2001
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Date: Wed, 10 Oct 2001 13:20:38 -0400 (EDT)
From: Nguyen-Tuong Long Le <le@cs.unc.edu>
To: Alex Rousskov <rousskov@measurement-factory.com>
Cc: <freebsd-net@FreeBSD.ORG>
Subject: Re: Connect(2) problem
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Hello Alex,

Thanks very much for your reply!

Just our of curiosity, what is the use of
net.inet.ip.portrange.hifirst and net.inet.ip.portrange.hilast ?

Thanks,
Long

On Tue, 9 Oct 2001, Alex Rousskov wrote:

>
> Are you running out of ephemeral ports? See net.inet.ip.portrange
> sysctl or do your own port management.
>
> Alex.
>
> On Tue, 9 Oct 2001, Nguyen-Tuong Long Le wrote:
>
> > Hi all,
> >
> > I have a software that simulates web clients and servers to create
> > network congestion (for the purpose of doing research in network
> > congestion). In our experiment, a client opens an HTTP connection
> > to a server, fetches a number of objects, and then closes the
> > connection. A problem I seem to have right now is that a client
> > machine cannot simulate more than 3000 connections. When my client
> > machine simulates more than 3000 connections, it's able to open
> > a socket but then connect(2) fails with errno 35 (Resource
> > temporarily unavailable). Another interesting notice is that the
> > connect(2) system call blocks for a few miliseconds before it
> > fails although fcntl(2) was used to make the socket non-blocking.
> > The OS version I am using is FreeBSD 4.3-release.
> >
> > I used sysctl to bump up kern.maxfiles and kern.maxfilesperproc to
> > 16384. I also bumped up kern.ipc.somaxconn to 8192 on the server
> > side. I recompiled the kernel with option NMBCLUSTERS=65536 to
> > increase the number of mbufs. I guess that CPU is not the bottleneck
> > since I have the same problem regardless whether I use a 300 MHz or
> > a 1 GHz machine.
> >
> > Does anyone have any suggestion what kind of resources my client machine
> > runs out and how I can fix it?
> >
> > Thanks,
> > Long
> >
> > P.S. Please kindly email your reply to me since I am not on the list.
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-net" in the body of the message
> >
>
>


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